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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Genetic Characteristics of Coronaviruses from Korean Bats in 2016</title>
<author><name sortKey="Lee, Saemi" sort="Lee, Saemi" uniqKey="Lee S" first="Saemi" last="Lee">Saemi Lee</name>
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<institution>Environmental Health Research Department,</institution>
<institution>National Institute of Environmental Research,</institution>
</institution-wrap>
Hwangyeong-ro 42, Seo-gu, Incheon, 22689 Republic of Korea</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Jo, Seong Deok" sort="Jo, Seong Deok" uniqKey="Jo S" first="Seong-Deok" last="Jo">Seong-Deok Jo</name>
<affiliation><nlm:aff id="Aff1"><institution-wrap><institution-id institution-id-type="ISNI">0000 0004 0647 9913</institution-id>
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<institution>Environmental Health Research Department,</institution>
<institution>National Institute of Environmental Research,</institution>
</institution-wrap>
Hwangyeong-ro 42, Seo-gu, Incheon, 22689 Republic of Korea</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Son, Kidong" sort="Son, Kidong" uniqKey="Son K" first="Kidong" last="Son">Kidong Son</name>
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<institution-id institution-id-type="GRID">grid.419585.4</institution-id>
<institution>Environmental Health Research Department,</institution>
<institution>National Institute of Environmental Research,</institution>
</institution-wrap>
Hwangyeong-ro 42, Seo-gu, Incheon, 22689 Republic of Korea</nlm:aff>
</affiliation>
</author>
<author><name sortKey="An, Injung" sort="An, Injung" uniqKey="An I" first="Injung" last="An">Injung An</name>
<affiliation><nlm:aff id="Aff1"><institution-wrap><institution-id institution-id-type="ISNI">0000 0004 0647 9913</institution-id>
<institution-id institution-id-type="GRID">grid.419585.4</institution-id>
<institution>Environmental Health Research Department,</institution>
<institution>National Institute of Environmental Research,</institution>
</institution-wrap>
Hwangyeong-ro 42, Seo-gu, Incheon, 22689 Republic of Korea</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Jeong, Jipseol" sort="Jeong, Jipseol" uniqKey="Jeong J" first="Jipseol" last="Jeong">Jipseol Jeong</name>
<affiliation><nlm:aff id="Aff1"><institution-wrap><institution-id institution-id-type="ISNI">0000 0004 0647 9913</institution-id>
<institution-id institution-id-type="GRID">grid.419585.4</institution-id>
<institution>Environmental Health Research Department,</institution>
<institution>National Institute of Environmental Research,</institution>
</institution-wrap>
Hwangyeong-ro 42, Seo-gu, Incheon, 22689 Republic of Korea</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Wang, Seung Jun" sort="Wang, Seung Jun" uniqKey="Wang S" first="Seung-Jun" last="Wang">Seung-Jun Wang</name>
<affiliation><nlm:aff id="Aff1"><institution-wrap><institution-id institution-id-type="ISNI">0000 0004 0647 9913</institution-id>
<institution-id institution-id-type="GRID">grid.419585.4</institution-id>
<institution>Environmental Health Research Department,</institution>
<institution>National Institute of Environmental Research,</institution>
</institution-wrap>
Hwangyeong-ro 42, Seo-gu, Incheon, 22689 Republic of Korea</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Kim, Yongkwan" sort="Kim, Yongkwan" uniqKey="Kim Y" first="Yongkwan" last="Kim">Yongkwan Kim</name>
<affiliation><nlm:aff id="Aff1"><institution-wrap><institution-id institution-id-type="ISNI">0000 0004 0647 9913</institution-id>
<institution-id institution-id-type="GRID">grid.419585.4</institution-id>
<institution>Environmental Health Research Department,</institution>
<institution>National Institute of Environmental Research,</institution>
</institution-wrap>
Hwangyeong-ro 42, Seo-gu, Incheon, 22689 Republic of Korea</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Jheong, Weonhwa" sort="Jheong, Weonhwa" uniqKey="Jheong W" first="Weonhwa" last="Jheong">Weonhwa Jheong</name>
<affiliation><nlm:aff id="Aff1"><institution-wrap><institution-id institution-id-type="ISNI">0000 0004 0647 9913</institution-id>
<institution-id institution-id-type="GRID">grid.419585.4</institution-id>
<institution>Environmental Health Research Department,</institution>
<institution>National Institute of Environmental Research,</institution>
</institution-wrap>
Hwangyeong-ro 42, Seo-gu, Incheon, 22689 Republic of Korea</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Oem, Jae Ku" sort="Oem, Jae Ku" uniqKey="Oem J" first="Jae-Ku" last="Oem">Jae-Ku Oem</name>
<affiliation><nlm:aff id="Aff1"><institution-wrap><institution-id institution-id-type="ISNI">0000 0004 0647 9913</institution-id>
<institution-id institution-id-type="GRID">grid.419585.4</institution-id>
<institution>Environmental Health Research Department,</institution>
<institution>National Institute of Environmental Research,</institution>
</institution-wrap>
Hwangyeong-ro 42, Seo-gu, Incheon, 22689 Republic of Korea</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="Aff2"><institution-wrap><institution-id institution-id-type="ISNI">0000 0004 0470 4320</institution-id>
<institution-id institution-id-type="GRID">grid.411545.0</institution-id>
<institution>Department of Veterinary Infectious Diseases, College of Veterinary Medicine,</institution>
<institution>Chonbuk National University,</institution>
</institution-wrap>
Iksan, Republic of Korea</nlm:aff>
</affiliation>
</author>
</titleStmt>
<publicationStmt><idno type="wicri:source">PMC</idno>
<idno type="pmid">28725945</idno>
<idno type="pmc">7079938</idno>
<idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7079938</idno>
<idno type="RBID">PMC:7079938</idno>
<idno type="doi">10.1007/s00248-017-1033-8</idno>
<date when="2017">2017</date>
<idno type="wicri:Area/Pmc/Corpus">000397</idno>
<idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">000397</idno>
</publicationStmt>
<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Genetic Characteristics of Coronaviruses from Korean Bats in 2016</title>
<author><name sortKey="Lee, Saemi" sort="Lee, Saemi" uniqKey="Lee S" first="Saemi" last="Lee">Saemi Lee</name>
<affiliation><nlm:aff id="Aff1"><institution-wrap><institution-id institution-id-type="ISNI">0000 0004 0647 9913</institution-id>
<institution-id institution-id-type="GRID">grid.419585.4</institution-id>
<institution>Environmental Health Research Department,</institution>
<institution>National Institute of Environmental Research,</institution>
</institution-wrap>
Hwangyeong-ro 42, Seo-gu, Incheon, 22689 Republic of Korea</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Jo, Seong Deok" sort="Jo, Seong Deok" uniqKey="Jo S" first="Seong-Deok" last="Jo">Seong-Deok Jo</name>
<affiliation><nlm:aff id="Aff1"><institution-wrap><institution-id institution-id-type="ISNI">0000 0004 0647 9913</institution-id>
<institution-id institution-id-type="GRID">grid.419585.4</institution-id>
<institution>Environmental Health Research Department,</institution>
<institution>National Institute of Environmental Research,</institution>
</institution-wrap>
Hwangyeong-ro 42, Seo-gu, Incheon, 22689 Republic of Korea</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Son, Kidong" sort="Son, Kidong" uniqKey="Son K" first="Kidong" last="Son">Kidong Son</name>
<affiliation><nlm:aff id="Aff1"><institution-wrap><institution-id institution-id-type="ISNI">0000 0004 0647 9913</institution-id>
<institution-id institution-id-type="GRID">grid.419585.4</institution-id>
<institution>Environmental Health Research Department,</institution>
<institution>National Institute of Environmental Research,</institution>
</institution-wrap>
Hwangyeong-ro 42, Seo-gu, Incheon, 22689 Republic of Korea</nlm:aff>
</affiliation>
</author>
<author><name sortKey="An, Injung" sort="An, Injung" uniqKey="An I" first="Injung" last="An">Injung An</name>
<affiliation><nlm:aff id="Aff1"><institution-wrap><institution-id institution-id-type="ISNI">0000 0004 0647 9913</institution-id>
<institution-id institution-id-type="GRID">grid.419585.4</institution-id>
<institution>Environmental Health Research Department,</institution>
<institution>National Institute of Environmental Research,</institution>
</institution-wrap>
Hwangyeong-ro 42, Seo-gu, Incheon, 22689 Republic of Korea</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Jeong, Jipseol" sort="Jeong, Jipseol" uniqKey="Jeong J" first="Jipseol" last="Jeong">Jipseol Jeong</name>
<affiliation><nlm:aff id="Aff1"><institution-wrap><institution-id institution-id-type="ISNI">0000 0004 0647 9913</institution-id>
<institution-id institution-id-type="GRID">grid.419585.4</institution-id>
<institution>Environmental Health Research Department,</institution>
<institution>National Institute of Environmental Research,</institution>
</institution-wrap>
Hwangyeong-ro 42, Seo-gu, Incheon, 22689 Republic of Korea</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Wang, Seung Jun" sort="Wang, Seung Jun" uniqKey="Wang S" first="Seung-Jun" last="Wang">Seung-Jun Wang</name>
<affiliation><nlm:aff id="Aff1"><institution-wrap><institution-id institution-id-type="ISNI">0000 0004 0647 9913</institution-id>
<institution-id institution-id-type="GRID">grid.419585.4</institution-id>
<institution>Environmental Health Research Department,</institution>
<institution>National Institute of Environmental Research,</institution>
</institution-wrap>
Hwangyeong-ro 42, Seo-gu, Incheon, 22689 Republic of Korea</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Kim, Yongkwan" sort="Kim, Yongkwan" uniqKey="Kim Y" first="Yongkwan" last="Kim">Yongkwan Kim</name>
<affiliation><nlm:aff id="Aff1"><institution-wrap><institution-id institution-id-type="ISNI">0000 0004 0647 9913</institution-id>
<institution-id institution-id-type="GRID">grid.419585.4</institution-id>
<institution>Environmental Health Research Department,</institution>
<institution>National Institute of Environmental Research,</institution>
</institution-wrap>
Hwangyeong-ro 42, Seo-gu, Incheon, 22689 Republic of Korea</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Jheong, Weonhwa" sort="Jheong, Weonhwa" uniqKey="Jheong W" first="Weonhwa" last="Jheong">Weonhwa Jheong</name>
<affiliation><nlm:aff id="Aff1"><institution-wrap><institution-id institution-id-type="ISNI">0000 0004 0647 9913</institution-id>
<institution-id institution-id-type="GRID">grid.419585.4</institution-id>
<institution>Environmental Health Research Department,</institution>
<institution>National Institute of Environmental Research,</institution>
</institution-wrap>
Hwangyeong-ro 42, Seo-gu, Incheon, 22689 Republic of Korea</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Oem, Jae Ku" sort="Oem, Jae Ku" uniqKey="Oem J" first="Jae-Ku" last="Oem">Jae-Ku Oem</name>
<affiliation><nlm:aff id="Aff1"><institution-wrap><institution-id institution-id-type="ISNI">0000 0004 0647 9913</institution-id>
<institution-id institution-id-type="GRID">grid.419585.4</institution-id>
<institution>Environmental Health Research Department,</institution>
<institution>National Institute of Environmental Research,</institution>
</institution-wrap>
Hwangyeong-ro 42, Seo-gu, Incheon, 22689 Republic of Korea</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="Aff2"><institution-wrap><institution-id institution-id-type="ISNI">0000 0004 0470 4320</institution-id>
<institution-id institution-id-type="GRID">grid.411545.0</institution-id>
<institution>Department of Veterinary Infectious Diseases, College of Veterinary Medicine,</institution>
<institution>Chonbuk National University,</institution>
</institution-wrap>
Iksan, Republic of Korea</nlm:aff>
</affiliation>
</author>
</analytic>
<series><title level="j">Microbial Ecology</title>
<idno type="ISSN">0095-3628</idno>
<idno type="eISSN">1432-184X</idno>
<imprint><date when="2017">2017</date>
</imprint>
</series>
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</teiHeader>
<front><div type="abstract" xml:lang="en"><p id="Par1">Bats have increasingly been recognized as the natural reservoir of severe acute respiratory syndrome (SARS), coronavirus, and other coronaviruses found in mammals. However, little research has been conducted on bat coronaviruses in South Korea. In this study, bat samples (332 oral swabs, 245 fecal samples, 38 urine samples, and 57 bat carcasses) were collected at 33 natural bat habitat sites in South Korea. RT-PCR and sequencing were performed for specific coronavirus genes to identify the bat coronaviruses in different bat samples. Coronaviruses were detected in 2.7% (18/672) of the samples: 13 oral swabs from one species of the family <italic>Rhinolophidae</italic>
, and four fecal samples and one carcass (intestine) from three species of the family <italic>Vespertiliodae</italic>
. To determine the genetic relationships of the 18 sequences obtained in this study and previously known coronaviruses, the nucleotide sequences of a 392-nt region of the RNA-dependent RNA polymerase (RdRp) gene were analyzed phylogenetically. Thirteen sequences belonging to SARS-like betacoronaviruses showed the highest nucleotide identity (97.1–99.7%) with Bat-CoV-JTMC15 reported in China. The other five sequences were most similar to MERS-like betacoronaviruses. Four nucleotide sequences displayed the highest identity (94.1–95.1%) with Bat-CoV-HKU5 from Hong Kong. The one sequence from a carcass showed the highest nucleotide identity (99%) with Bat-CoV-SC2013 from China. These results suggest that careful surveillance of coronaviruses from bats should be continued, because animal and human infections may result from the genetic variants present in bat coronavirus reservoirs.</p>
</div>
</front>
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<pmc article-type="research-article"><pmc-dir>properties open_access</pmc-dir>
<front><journal-meta><journal-id journal-id-type="nlm-ta">Microb Ecol</journal-id>
<journal-id journal-id-type="iso-abbrev">Microb. Ecol</journal-id>
<journal-title-group><journal-title>Microbial Ecology</journal-title>
</journal-title-group>
<issn pub-type="ppub">0095-3628</issn>
<issn pub-type="epub">1432-184X</issn>
<publisher><publisher-name>Springer US</publisher-name>
<publisher-loc>New York</publisher-loc>
</publisher>
</journal-meta>
<article-meta><article-id pub-id-type="pmid">28725945</article-id>
<article-id pub-id-type="pmc">7079938</article-id>
<article-id pub-id-type="publisher-id">1033</article-id>
<article-id pub-id-type="doi">10.1007/s00248-017-1033-8</article-id>
<article-categories><subj-group subj-group-type="heading"><subject>Environmental Microbiology</subject>
</subj-group>
</article-categories>
<title-group><article-title>Genetic Characteristics of Coronaviruses from Korean Bats in 2016</article-title>
</title-group>
<contrib-group><contrib contrib-type="author"><name><surname>Lee</surname>
<given-names>Saemi</given-names>
</name>
<xref ref-type="aff" rid="Aff1">1</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Jo</surname>
<given-names>Seong-Deok</given-names>
</name>
<xref ref-type="aff" rid="Aff1">1</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Son</surname>
<given-names>Kidong</given-names>
</name>
<xref ref-type="aff" rid="Aff1">1</xref>
</contrib>
<contrib contrib-type="author"><name><surname>An</surname>
<given-names>Injung</given-names>
</name>
<xref ref-type="aff" rid="Aff1">1</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Jeong</surname>
<given-names>Jipseol</given-names>
</name>
<xref ref-type="aff" rid="Aff1">1</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Wang</surname>
<given-names>Seung-Jun</given-names>
</name>
<xref ref-type="aff" rid="Aff1">1</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Kim</surname>
<given-names>Yongkwan</given-names>
</name>
<xref ref-type="aff" rid="Aff1">1</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Jheong</surname>
<given-names>Weonhwa</given-names>
</name>
<xref ref-type="aff" rid="Aff1">1</xref>
</contrib>
<contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">http://orcid.org/0000-0002-4298-0604</contrib-id>
<name><surname>Oem</surname>
<given-names>Jae-Ku</given-names>
</name>
<address><phone>+82 32 560 7145</phone>
<email>jku0623@korea.kr</email>
</address>
<xref ref-type="aff" rid="Aff1">1</xref>
<xref ref-type="aff" rid="Aff2">2</xref>
</contrib>
<aff id="Aff1"><label>1</label>
<institution-wrap><institution-id institution-id-type="ISNI">0000 0004 0647 9913</institution-id>
<institution-id institution-id-type="GRID">grid.419585.4</institution-id>
<institution>Environmental Health Research Department,</institution>
<institution>National Institute of Environmental Research,</institution>
</institution-wrap>
Hwangyeong-ro 42, Seo-gu, Incheon, 22689 Republic of Korea</aff>
<aff id="Aff2"><label>2</label>
<institution-wrap><institution-id institution-id-type="ISNI">0000 0004 0470 4320</institution-id>
<institution-id institution-id-type="GRID">grid.411545.0</institution-id>
<institution>Department of Veterinary Infectious Diseases, College of Veterinary Medicine,</institution>
<institution>Chonbuk National University,</institution>
</institution-wrap>
Iksan, Republic of Korea</aff>
</contrib-group>
<pub-date pub-type="epub"><day>19</day>
<month>7</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="ppub"><year>2018</year>
</pub-date>
<volume>75</volume>
<issue>1</issue>
<fpage>174</fpage>
<lpage>182</lpage>
<history><date date-type="received"><day>24</day>
<month>2</month>
<year>2017</year>
</date>
<date date-type="accepted"><day>4</day>
<month>7</month>
<year>2017</year>
</date>
</history>
<permissions><copyright-statement>© Springer Science+Business Media, LLC 2017</copyright-statement>
<license><license-p>This article is made available via the PMC Open Access Subset for unrestricted research re-use and secondary analysis in any form or by any means with acknowledgement of the original source. These permissions are granted for the duration of the World Health Organization (WHO) declaration of COVID-19 as a global pandemic.</license-p>
</license>
</permissions>
<abstract id="Abs1"><p id="Par1">Bats have increasingly been recognized as the natural reservoir of severe acute respiratory syndrome (SARS), coronavirus, and other coronaviruses found in mammals. However, little research has been conducted on bat coronaviruses in South Korea. In this study, bat samples (332 oral swabs, 245 fecal samples, 38 urine samples, and 57 bat carcasses) were collected at 33 natural bat habitat sites in South Korea. RT-PCR and sequencing were performed for specific coronavirus genes to identify the bat coronaviruses in different bat samples. Coronaviruses were detected in 2.7% (18/672) of the samples: 13 oral swabs from one species of the family <italic>Rhinolophidae</italic>
, and four fecal samples and one carcass (intestine) from three species of the family <italic>Vespertiliodae</italic>
. To determine the genetic relationships of the 18 sequences obtained in this study and previously known coronaviruses, the nucleotide sequences of a 392-nt region of the RNA-dependent RNA polymerase (RdRp) gene were analyzed phylogenetically. Thirteen sequences belonging to SARS-like betacoronaviruses showed the highest nucleotide identity (97.1–99.7%) with Bat-CoV-JTMC15 reported in China. The other five sequences were most similar to MERS-like betacoronaviruses. Four nucleotide sequences displayed the highest identity (94.1–95.1%) with Bat-CoV-HKU5 from Hong Kong. The one sequence from a carcass showed the highest nucleotide identity (99%) with Bat-CoV-SC2013 from China. These results suggest that careful surveillance of coronaviruses from bats should be continued, because animal and human infections may result from the genetic variants present in bat coronavirus reservoirs.</p>
</abstract>
<kwd-group xml:lang="en"><title>Keywords</title>
<kwd>Coronavirus</kwd>
<kwd>Bats</kwd>
<kwd>South Korea</kwd>
<kwd>Severe acute respiratory syndrome</kwd>
<kwd>Middle East respiratory syndrome</kwd>
<kwd>Phylogenetic analysis</kwd>
</kwd-group>
<custom-meta-group><custom-meta><meta-name>issue-copyright-statement</meta-name>
<meta-value>© Springer Science+Business Media, LLC, part of Springer Nature 2018</meta-value>
</custom-meta>
</custom-meta-group>
</article-meta>
</front>
<body><sec id="Sec1"><title>Introduction</title>
<p id="Par2">Coronaviruses are large, pleomorphic, enveloped viruses containing a single linear, positive-sense single-stranded RNA molecule. Coronavirus genomes are approximately 27–32 kb in length, the largest continuous RNA genomes among mammalian viruses [<xref ref-type="bibr" rid="CR1">1</xref>
]. Coronaviruses are classified into four genera: alpha, beta, gamma, and delta [<xref ref-type="bibr" rid="CR2">2</xref>
]. Coronaviruses are the second most prevalent cause of the common cold in humans [<xref ref-type="bibr" rid="CR3">3</xref>
]. In livestock and poultry, coronaviruses are recognized causes of enteric and respiratory infections that are often fatal in young animals [<xref ref-type="bibr" rid="CR4">4</xref>
]. An outbreak of severe acute respiratory syndrome (SARS) in 2002 and 2003 resulted in infection of 8096 people worldwide, with 774 (9.5%) of them dying from this novel human coronavirus [<xref ref-type="bibr" rid="CR5">5</xref>
]. SARS coronavirus is believed to have been acquired from an animal species, and the Chinese horseshoe bat may have been the original source of SARS infection [<xref ref-type="bibr" rid="CR6">6</xref>
–<xref ref-type="bibr" rid="CR9">9</xref>
]. The emergent Middle East respiratory syndrome coronavirus (MERS-CoV) may also have originated in bats, with fragments of MERS-CoV genes being identified in bats from both Saudi Arabia [<xref ref-type="bibr" rid="CR10">10</xref>
] and Africa [<xref ref-type="bibr" rid="CR11">11</xref>
]. More than 200 viruses have been isolated from and detected in bats [<xref ref-type="bibr" rid="CR12">12</xref>
]. The ability of bats to fly and migrate, as well as the large sizes of their social groups, predisposes bats to acquire and maintain viruses [<xref ref-type="bibr" rid="CR13">13</xref>
].</p>
<p id="Par3">Given the import of MERS into South Korea [<xref ref-type="bibr" rid="CR14">14</xref>
] and the presence of SARS in the relatively close geographic location of China [<xref ref-type="bibr" rid="CR9">9</xref>
] (Fig. <xref rid="Fig3" ref-type="fig">3</xref>
), together with the fact that bats are a reservoir for coronaviruses, the prevalence of coronavirus infection in Korean bat species should provide valuable information. Although SARS-like and MERS-like bat coronaviruses have already been reported in the feces of Korean bats [<xref ref-type="bibr" rid="CR14">14</xref>
], the prevalence and presence of coronaviruses in other bat samples have not been described. Therefore, we investigated the prevalence of coronaviruses in Korean bat species using various kinds of samples, including oral swabs, fecal and urine samples, and carcasses. The coronaviruses found were characterized for their relationships to each other and to coronaviruses isolated in South Korea and in other countries.</p>
</sec>
<sec id="Sec2"><title>Materials and Methods</title>
<sec id="Sec3"><title>Sample Collection</title>
<p id="Par4">A total of 672 samples (332 oral swabs, 245 fecal samples, 38 urine samples, and 57 bat carcasses) were collected at 33 sites of natural bat habitat from January 2016 to September 2016 (Table <xref rid="Tab1" ref-type="table">1</xref>
). Bats were captured by net for collection of oral swabs, fecal samples, and urine samples, and released immediately after sampling. Fecal samples were also collected from guano. The bat carcasses collected were naturally dead bats found at the site where the other samples were taken. Swab samples were kept in viral transport medium at 4 °C, and organs collected from carcasses and other samples were stored at −80 °C before processing.<table-wrap id="Tab1"><label>Table 1</label>
<caption><p>Bat sample information</p>
</caption>
<table frame="hsides" rules="groups"><thead><tr><th rowspan="2">Region 1</th>
<th rowspan="2">Region 2</th>
<th rowspan="2">Site name</th>
<th rowspan="2">Site type</th>
<th rowspan="2">Major bat species</th>
<th colspan="5">No. of samples</th>
</tr>
<tr><th>Oral swab</th>
<th>Feces</th>
<th>Carcass</th>
<th>Urine</th>
<th>Total</th>
</tr>
</thead>
<tbody><tr><td>Gangwon</td>
<td>Yeongwol</td>
<td>YW 1</td>
<td>Forest</td>
<td><italic>Eptesicus serotinus</italic>
</td>
<td>11</td>
<td>18</td>
<td></td>
<td></td>
<td>29</td>
</tr>
<tr><td>Gyeongnam</td>
<td>Changwon</td>
<td>CW 1</td>
<td>Abandoned mine</td>
<td><italic>Rhinolophus ferrumequinum</italic>
</td>
<td></td>
<td>7</td>
<td></td>
<td></td>
<td>7</td>
</tr>
<tr><td rowspan="12">Gyeongbuk</td>
<td rowspan="4">Gyeongju</td>
<td>GJ 1</td>
<td>Abandoned mine</td>
<td><italic>Rhinolophus ferrumequinum</italic>
</td>
<td>70</td>
<td>2</td>
<td char="." align="char">6</td>
<td char="." align="char">12</td>
<td>90</td>
</tr>
<tr><td>GJ 2</td>
<td>Forest</td>
<td><italic>Myotis aurascens</italic>
</td>
<td>1</td>
<td>1</td>
<td></td>
<td></td>
<td>2</td>
</tr>
<tr><td rowspan="2">GJ 3</td>
<td>In area of private houses</td>
<td><italic>Pipistrelus abramus</italic>
</td>
<td></td>
<td>10</td>
<td></td>
<td></td>
<td>10</td>
</tr>
<tr><td>Forest</td>
<td><italic>Pipistrelus abramus</italic>
</td>
<td></td>
<td>5</td>
<td></td>
<td></td>
<td>5</td>
</tr>
<tr><td rowspan="2">Andong</td>
<td>AD 1</td>
<td>Forest</td>
<td><italic>Eptesicus serotinus</italic>
</td>
<td>25</td>
<td>18</td>
<td></td>
<td></td>
<td>43</td>
</tr>
<tr><td>AD 2</td>
<td>Forest</td>
<td><italic>Eptesicus serotinus</italic>
</td>
<td>6</td>
<td>2</td>
<td></td>
<td char="." align="char">2</td>
<td>10</td>
</tr>
<tr><td rowspan="2">Yeongdeok</td>
<td>YD 1</td>
<td>Abandoned mine</td>
<td><italic>Myotis macrodactylus</italic>
</td>
<td>2</td>
<td></td>
<td char="." align="char">3</td>
<td></td>
<td>5</td>
</tr>
<tr><td>YD 2</td>
<td>Forest</td>
<td><italic>Pipistrelus abramus</italic>
</td>
<td></td>
<td>5</td>
<td></td>
<td></td>
<td>5</td>
</tr>
<tr><td rowspan="2">Yeongju</td>
<td>YJ 1</td>
<td>Abandoned mine</td>
<td><italic>Myotis nattereri</italic>
</td>
<td>23</td>
<td>6</td>
<td char="." align="char">1</td>
<td></td>
<td>30</td>
</tr>
<tr><td>YJ 2</td>
<td>Forest, stream</td>
<td><italic>Pipistrelus abramus</italic>
</td>
<td></td>
<td>5</td>
<td></td>
<td></td>
<td>5</td>
</tr>
<tr><td>Yeongcheon</td>
<td>YC 1</td>
<td>Abandoned mine</td>
<td><italic>Miniopterus schreibersii</italic>
</td>
<td></td>
<td></td>
<td char="." align="char">12</td>
<td></td>
<td>12</td>
</tr>
<tr><td>Cheongsong</td>
<td>CS 1</td>
<td>Forest, valley</td>
<td><italic>Myotis petax</italic>
</td>
<td>4</td>
<td>1</td>
<td></td>
<td></td>
<td>5</td>
</tr>
<tr><td rowspan="2">Gwangju</td>
<td>Shinchon</td>
<td>GwJ 1</td>
<td>Forest</td>
<td><italic>Eptesicus serotinus</italic>
</td>
<td>11</td>
<td>6</td>
<td></td>
<td char="." align="char">1</td>
<td>18</td>
</tr>
<tr><td>Seokgok</td>
<td>GwJ 2</td>
<td>Cave</td>
<td><italic>Rhinolophus ferrumequinum</italic>
</td>
<td>5</td>
<td></td>
<td></td>
<td></td>
<td>5</td>
</tr>
<tr><td>Daegu</td>
<td>Dalseong</td>
<td>DS 1</td>
<td>Forest, stream</td>
<td><italic>Pipistrelus abramus</italic>
</td>
<td></td>
<td>5</td>
<td></td>
<td></td>
<td>5</td>
</tr>
<tr><td rowspan="4">Ulsan</td>
<td rowspan="4">Ulju</td>
<td>US 1</td>
<td>Abandoned mine</td>
<td><italic>Rhinolophus ferrumequinum</italic>
</td>
<td>12</td>
<td></td>
<td char="." align="char">2</td>
<td char="." align="char">8</td>
<td>22</td>
</tr>
<tr><td rowspan="2">US 2</td>
<td>In area of private houses</td>
<td><italic>Eptesicus serotinus</italic>
</td>
<td>1</td>
<td>1</td>
<td></td>
<td></td>
<td>2</td>
</tr>
<tr><td>Forest</td>
<td><italic>Eptesicus serotinus</italic>
</td>
<td>31</td>
<td>31</td>
<td></td>
<td></td>
<td>62</td>
</tr>
<tr><td>US 3</td>
<td>Forest</td>
<td><italic>Myotis aurascens</italic>
</td>
<td>9</td>
<td></td>
<td></td>
<td></td>
<td>9</td>
</tr>
<tr><td rowspan="5">Jeonnam</td>
<td>Gurye</td>
<td>GR 1</td>
<td>Forest</td>
<td><italic>Eptesicus serotinus</italic>
</td>
<td>12</td>
<td></td>
<td></td>
<td></td>
<td>12</td>
</tr>
<tr><td rowspan="2">Muan</td>
<td>MA 1</td>
<td>Abandoned mine</td>
<td><italic>Myotis macrodactylus</italic>
</td>
<td>7</td>
<td></td>
<td></td>
<td char="." align="char">1</td>
<td>8</td>
</tr>
<tr><td>MA U</td>
<td>Cave</td>
<td><italic>Myotis formosus chofukusei</italic>
</td>
<td>2</td>
<td>5</td>
<td></td>
<td></td>
<td>7</td>
</tr>
<tr><td>Jindo</td>
<td>JD 1</td>
<td>Abandoned mine</td>
<td><italic>Rhinolophus ferrumequinum</italic>
</td>
<td>10</td>
<td>1</td>
<td char="." align="char">1</td>
<td></td>
<td>12</td>
</tr>
<tr><td>Hampyeong</td>
<td>HP U</td>
<td>Cave</td>
<td><italic>Myotis formosus chofukusei</italic>
</td>
<td>3</td>
<td></td>
<td></td>
<td></td>
<td>3</td>
</tr>
<tr><td>Jeonbuk</td>
<td>Sunchang</td>
<td>SC 1</td>
<td>Abandoned mine</td>
<td><italic>Rhinolophus ferrumequinum</italic>
</td>
<td>43</td>
<td>3</td>
<td char="." align="char">10</td>
<td char="." align="char">4</td>
<td>60</td>
</tr>
<tr><td>Chungnam</td>
<td>Seosan</td>
<td>SS U</td>
<td>Abandoned mine</td>
<td><italic>Myotis formosus chofukusei</italic>
</td>
<td>3</td>
<td>4</td>
<td></td>
<td></td>
<td>7</td>
</tr>
<tr><td rowspan="7">Chungbuk</td>
<td rowspan="7">Danyang</td>
<td>DY 1</td>
<td>Cave</td>
<td><italic>Miniopterus schreibersii</italic>
</td>
<td>7</td>
<td>65</td>
<td char="." align="char">22</td>
<td></td>
<td>94</td>
</tr>
<tr><td>DY 2</td>
<td>Cave</td>
<td><italic>Myotis macrodactylus</italic>
</td>
<td></td>
<td>2</td>
<td></td>
<td char="." align="char">2</td>
<td>4</td>
</tr>
<tr><td>DY 3</td>
<td>Cave</td>
<td><italic>Miniopterus schreibersii</italic>
</td>
<td>18</td>
<td>1</td>
<td></td>
<td char="." align="char">6</td>
<td>25</td>
</tr>
<tr><td>DY 4</td>
<td>Cave</td>
<td><italic>Miniopterus schreibersii</italic>
</td>
<td></td>
<td>25</td>
<td></td>
<td></td>
<td>25</td>
</tr>
<tr><td>DY 5</td>
<td>Forest, valley</td>
<td><italic>Myotis ikonnikovi</italic>
</td>
<td>1</td>
<td></td>
<td></td>
<td></td>
<td>1</td>
</tr>
<tr><td>DY 6</td>
<td>Forest, valley</td>
<td><italic>Myotis ikonnikovi</italic>
</td>
<td>8</td>
<td>6</td>
<td></td>
<td char="." align="char">2</td>
<td>16</td>
</tr>
<tr><td>DY 7</td>
<td>Forest</td>
<td><italic>Murina leucogaster</italic>
</td>
<td>7</td>
<td>10</td>
<td></td>
<td></td>
<td>17</td>
</tr>
<tr><td>Total</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>332</td>
<td>245</td>
<td char="." align="char">57</td>
<td char="." align="char">38</td>
<td>672</td>
</tr>
</tbody>
</table>
</table-wrap>
</p>
</sec>
<sec id="Sec4"><title>Genome Detection and Sequencing</title>
<p id="Par5">All fecal and tissue samples were resuspended in 1% antibiotic-antimycotic solution (Corning, USA) diluted in phosphate-buffered saline (PBS), and clarified by centrifugation at 3500×<italic>g</italic>
for 10 min. RNA from 200 μL sample was extracted with the QIAamp® Viral RNA Mini Kit (Qiagen, Germany) and eluted in 60 μL RNase-free water. cDNA was synthesized by PrimeScript First Strand cDNA Synthesis Kit (TaKaRa, Japan) following the manufacturer’s instructions. Bat-CoV screening was performed by a pan-coronavirus PCR method based on primers used by Poon et al. (Corona 1 forward, 5′-GGTTGGGACTATCCTAAGTGTGA-3′, and Corona 2 reverse, 5′-CCATCATCAGATAGAATCATCATA-3′) [<xref ref-type="bibr" rid="CR15">15</xref>
], followed by sequencing of the amplified product to confirm Bat-CoV identification. The pan-coronavirus primers were used to amplify and sequence a 440-bp segment of the highly conserved RNA-dependent RNA polymerase (RdRp) gene. Cycle sequencing reactions were performed using the BigDye® Terminator Cycle Sequencing kit version 1.1 (Applied Biosystems, Foster City, CA, USA). Reactions were purified using SigmaSpin™ Post-reaction Clean-Up Columns (Sigma, St. Louis, MO, USA) and sequenced on an ABI PRISM 3130 automated capillary DNA sequencer (Applied Biosystems) according to the manufacturer’s instructions. Primer sequences were excluded from the raw sequence data, and the sequences we analyzed were 392-bp long. All sequences obtained in this study were submitted to GenBank (accession numbers KY432454–432471).</p>
</sec>
<sec id="Sec5"><title>Phylogenetic Analysis</title>
<p id="Par6">The nucleotide sequences were aligned and compared to 52 selected human and animal CoV sequences available from the GenBank database using ClustalW software implemented in BioEdit version 7.0.9.0. The phylogenetic trees were drawn using the neighbor joining method using the maximum composite likelihood model with MEGA 7 software.</p>
</sec>
</sec>
<sec id="Sec6"><title>Results</title>
<sec id="Sec7"><title>Prevalence of Coronavirus Infection in Bats</title>
<p id="Par7">Coronaviruses were detected in 13 oral swabs, one carcass (intestine), and four fecal samples from a total of 672 samples, giving an overall detection rate of 2.7% (18/672). Four of the 14 bat species tested were found to harbor coronavirus. Thirteen positive oral swabs were detected from one species of the family <italic>Rhinolophidae</italic>
, which accounted for 24.3% (163/672) of the samples, and the other positive samples were from <italic>Vespertilionidae</italic>
bats that comprised 55.5% (373/672) of the samples.</p>
<p id="Par8">The 13 coronavirus-positive oral swabs were collected from bats at an abandoned mine in Jeonbuk province (Fig. <xref rid="Fig1" ref-type="fig">1</xref>
). Oral swabs and other samples (<italic>n</italic>
= 60) were obtained from three species of bats, <italic>Rhinolophus ferrumequinum</italic>
, <italic>Miniopterus schreibersii</italic>
, and <italic>Myotis macrodactylus</italic>
, but coronaviruses were only detected in samples from <italic>R. ferrumequinum</italic>
(Table <xref rid="Tab2" ref-type="table">2</xref>
)<italic>.</italic>
One carcass was collected from a cave in Chungbuk province (Fig. <xref rid="Fig1" ref-type="fig">1</xref>
). In total, 94 samples were obtained from six bat species (<italic>M. schreibersii</italic>
, <italic>Myotis petax</italic>
, <italic>Vespertilio sinensis</italic>
, <italic>Murina leucogaster</italic>
, <italic>R. ferrumequinum</italic>
, and <italic>M. macrodactylus</italic>
), and coronavirus was detected from a <italic>V. sinensis</italic>
sample<italic>.</italic>
Four coronavirus-positive fecal samples were collected in four different regions, in Gyeongbuk province (Andong, Yeongdeok, and Gyeongju) and in the metropolitan city Gwangju (Fig. <xref rid="Fig1" ref-type="fig">1</xref>
). In the forest of Andong, 43 samples in total were collected from three species of bats (<italic>Eptesicus serotinus</italic>
, <italic>M. petax</italic>
, and <italic>Pipistrelus abramus</italic>
), and coronavirus was detected from one <italic>P. abramus</italic>
bat<italic>.</italic>
In Yeongdeok, a total of five samples was collected from <italic>P. abramus</italic>
living in the forest, and one sample was positive for coronavirus. In the forest of Gyeongju, five samples in total were collected only from <italic>P. abramus</italic>
bats, and one of the samples was positive for coronavirus. In the forest of Gwangju, 18 samples in total were collected from two species of bats (<italic>E. serotinus</italic>
and <italic>Myotis aurascens</italic>
) and coronavirus was detected from one <italic>E. serotinus</italic>
bat (Table <xref rid="Tab2" ref-type="table">2</xref>
).<fig id="Fig1"><label>Fig. 1</label>
<caption><p>Location of South Korea and geographical location of coronavirus-positive bat samples. <italic>Black circle</italic>
Bat-CoV from oral swabsm. <italic>Black up-pointing triangle</italic>
Bat-CoV from fecal samples. <italic>White up-pointing triangle</italic>
Bat-CoV from a bat carcass</p>
</caption>
<graphic xlink:href="248_2017_1033_Fig1_HTML" id="MO1"></graphic>
</fig>
<table-wrap id="Tab2"><label>Table 2</label>
<caption><p>Coronavirus distribution in different bat species and provinces/metropolitan cities</p>
</caption>
<table frame="hsides" rules="groups"><thead><tr><th>Family</th>
<th>Species</th>
<th>Gangwon</th>
<th>Gyeongnam</th>
<th>Gyeongbuk</th>
<th>Gwangju</th>
<th>Daegu</th>
<th>Ulsan</th>
<th>Jeonnam</th>
<th>Jeonbuk</th>
<th>Chungnam</th>
<th>Chungbuk</th>
<th>Total</th>
</tr>
</thead>
<tbody><tr><td>Miniopteridae</td>
<td><italic>Miniopterus schreibersii</italic>
</td>
<td></td>
<td></td>
<td>0/6</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>0/19</td>
<td></td>
<td>0/102</td>
<td>0/127</td>
</tr>
<tr><td>Rhinolophidae</td>
<td><italic>Rhinolophus ferrumequinum</italic>
</td>
<td></td>
<td char="/" align="char">0/7</td>
<td>0/79</td>
<td>0/3</td>
<td></td>
<td char="/" align="char">0/20</td>
<td></td>
<td>13/24 (54.2%)<sup>b</sup>
</td>
<td></td>
<td>0/20</td>
<td>13/163 (8.0%)</td>
</tr>
<tr><td>Vespertilionidae</td>
<td><italic>Eptesicus serotinus</italic>
</td>
<td char="/" align="char">0/24</td>
<td></td>
<td>0/48</td>
<td>1/17 (5.9%)<sup>a</sup>
</td>
<td></td>
<td char="/" align="char">0/62</td>
<td char="/" align="char">0/12</td>
<td></td>
<td></td>
<td></td>
<td>1/163 (0.6%)</td>
</tr>
<tr><td></td>
<td><italic>Murina leucogaster</italic>
</td>
<td></td>
<td></td>
<td>0/18</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>0/15</td>
<td>0/33</td>
</tr>
<tr><td></td>
<td><italic>Murina ussuriensis</italic>
</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>0/3</td>
<td>0/3</td>
</tr>
<tr><td></td>
<td><italic>Myotis aurascens</italic>
</td>
<td></td>
<td></td>
<td>0/2</td>
<td>0/1</td>
<td></td>
<td char="/" align="char">0/7</td>
<td char="/" align="char">0/1</td>
<td></td>
<td></td>
<td></td>
<td>0/11</td>
</tr>
<tr><td></td>
<td><italic>Myotis formosus chofukusei</italic>
</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td char="/" align="char">0/5</td>
<td></td>
<td char="/" align="char">0/3</td>
<td></td>
<td>0/8</td>
</tr>
<tr><td></td>
<td><italic>Myotis ikonnikovi</italic>
</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>0/14</td>
<td>0/14</td>
</tr>
<tr><td></td>
<td><italic>Myotis macrodactylus</italic>
</td>
<td></td>
<td></td>
<td>0/4</td>
<td></td>
<td></td>
<td></td>
<td char="/" align="char">0/9</td>
<td>0/17</td>
<td></td>
<td>0/4</td>
<td>0/34</td>
</tr>
<tr><td></td>
<td><italic>Myotis nattereri</italic>
</td>
<td></td>
<td></td>
<td>0/29</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>0/29</td>
</tr>
<tr><td></td>
<td><italic>Myotis petax</italic>
</td>
<td></td>
<td></td>
<td>0/8</td>
<td></td>
<td></td>
<td char="/" align="char">0/4</td>
<td></td>
<td></td>
<td></td>
<td>0/15</td>
<td>0/27</td>
</tr>
<tr><td></td>
<td><italic>Pipistrellus alaschanicus</italic>
</td>
<td></td>
<td></td>
<td>0/1</td>
<td>0/2</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>0/3</td>
</tr>
<tr><td></td>
<td><italic>Pipistrelus abramus</italic>
</td>
<td char="/" align="char">0/5</td>
<td></td>
<td>3/27 (11.1%)<sup>a</sup>
</td>
<td></td>
<td char="/" align="char">0/5</td>
<td char="/" align="char">0/2</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>3/39 (7.7%)</td>
</tr>
<tr><td></td>
<td><italic>Vespertilio sinensis</italic>
</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>1/9 (11.1%)<sup>c</sup>
</td>
<td>1/9 (11.1%)</td>
</tr>
<tr><td>Unknown</td>
<td>Unknown</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td char="/" align="char">0/5</td>
<td></td>
<td char="/" align="char">0/4</td>
<td></td>
<td>0/9</td>
</tr>
<tr><td>Total</td>
<td></td>
<td char="/" align="char">0/29</td>
<td char="/" align="char">0/7</td>
<td>3/222 (1.4%)</td>
<td>1/23 (4.3%)</td>
<td char="/" align="char">0/5</td>
<td char="/" align="char">0/95</td>
<td char="/" align="char"><bold>0/42</bold>
</td>
<td>13/60 (21.7%)</td>
<td char="/" align="char">0/7</td>
<td>1/182 (0.5%)</td>
<td>18/672 (2.7%)</td>
</tr>
</tbody>
</table>
<table-wrap-foot><p><sup>a</sup>
Fecal samples</p>
<p><sup><bold>b</bold>
</sup>
Oral swabs</p>
<p><sup><bold>c</bold>
</sup>
Carcass (intestine)</p>
</table-wrap-foot>
</table-wrap>
</p>
</sec>
<sec id="Sec8"><title>Phylogenetic Characterization of Bat Coronaviruses Isolated in Korea</title>
<p id="Par9">To determine the genetic relationships between the 18 bat coronaviruses obtained in this study and previously known coronaviruses, the 392-nt RdRp sequences were analyzed phylogenetically. All the sequences obtained in this study belonged to the betacoronavirus genus (Fig. <xref rid="Fig2" ref-type="fig">2</xref>
). The sequences from 13 oral swabs (16BO122, 129, 132, 133, 134, 135, 139, 141, 143, 145, 150, 154, and 155) were grouped with the SARS-related bat betacoronaviruses, lineage B. Sequences from a carcass (16BT3) and four fecal samples (16BF104, 109, 211, and 244) were grouped with MERS-like bat betacoronaviruses, lineage C (Fig. <xref rid="Fig2" ref-type="fig">2</xref>
).<fig id="Fig2"><label>Fig. 2</label>
<caption><p>Phylogenetic tree constructed from 392-nt RdRp sequences of Korean bat coronaviruses detected in this study and from other coronaviruses. Phylogenetic trees were constructed by using the neighbor joining method and bootstrap values were determined by 3000 replicates. <italic>Scale bar</italic>
the estimated genetic distance of these viruses. <italic>Black circle</italic>
sequences from oral swabs <italic>Black up-pointing triangle</italic>
sequences from fecal samples. <italic>White up-pointing triangle</italic>
sequences from carcass</p>
</caption>
<graphic xlink:href="248_2017_1033_Fig2_HTML" id="MO2"></graphic>
</fig>
</p>
<p id="Par10">The 13 sequences from oral swabs were 97.1–100.0% identical with each other, and the closest known CoV strain, with 97.1–99.7% nucleotide identity, was Bat-CoV-JTMC15 that was recently isolated from <italic>R. ferrumequinum</italic>
in China. The nucleotide identity with SARS-CoV was only 86.7–89.0%. One sequence from a carcass showed the highest identity (99%) with Bat-CoV-SC2013 that was isolated from <italic>Vespertilio superans</italic>
(synonym of <italic>V. sinensis</italic>
), also from China [<xref ref-type="bibr" rid="CR16">16</xref>
]. The nucleotide identity with MERS-CoV was 83.9%. Four sequences from fecal samples shared 96.9–100.0% identity with each other and showed 94.1–95.1% identity with Bat-CoV HKU5 [<xref ref-type="bibr" rid="CR17">17</xref>
]. The nucleotide identity with MERS-CoV was 84.1–84.4%.</p>
<p id="Par11">Due to shorter reported sequences from Kim et al. [<xref ref-type="bibr" rid="CR14">14</xref>
], another phylogenetic tree was constructed from the 355-bp RdRp sequences of Korean bat coronaviruses obtained by Kim et al. [<xref ref-type="bibr" rid="CR14">14</xref>
] and in this study to analyze the genetic relation between Bat-CoVs in South Korea (Fig. <xref rid="Fig3" ref-type="fig">3</xref>
). Thirteen sequences from oral swabs were clustered with Bat-CoV B15–21, which was detected in fecal bat samples collected from an abandoned mine in Gangwon province. The major bat species present there was <italic>R. ferrumequinum</italic>
, but the coronavirus-positive bat species were not specified [<xref ref-type="bibr" rid="CR14">14</xref>
]. Nucleotide identity between Bat-CoV B15–21 and the 13 clustered sequences was 97.7–100.0%. The other three Korean bat coronaviruses (Bat-CoV B15–8, B15–40, and B15–41) belonged to the alphacoronavirus genus, but we did not detect coronaviruses belonging to this group in our study.<fig id="Fig3"><label>Fig. 3</label>
<caption><p>Phylogenetic tree of Korean bat coronaviruses detected by Kim et al. [<xref ref-type="bibr" rid="CR13">13</xref>
] and in this study, based on 355-nt sequences. Phylogenetic trees were constructed by using the neighbor joining method and bootstrap values were determined by 3000 replicates. <italic>Scale bar</italic>
the estimated genetic distance of these viruses. <italic>Black circle</italic>
sequences from oral swabs. <italic>Black up-pointing triangle</italic>
sequences from fecal samples. <italic>White up-pointing triangle</italic>
sequences from carcass</p>
</caption>
<graphic xlink:href="248_2017_1033_Fig3_HTML" id="MO3"></graphic>
</fig>
</p>
</sec>
</sec>
<sec id="Sec9"><title>Discussion</title>
<p id="Par12">There are approximately 24 species of bats in South Korea, and most are insectivorous and relatively small [<xref ref-type="bibr" rid="CR18">18</xref>
]. Bats in South Korea usually do not migrate over distances greater than 1000 km [<xref ref-type="bibr" rid="CR19">19</xref>
], but apart from two species found only in South Korea, they are generally distributed in neighboring countries such as China, East Siberia, Japan, and Taiwan. Although it is not clear if bats go between China and other countries, some species that migrate over 500 km can carry pathogens to South Korea. The fact that the 18 bat coronaviruses (Bat-CoVs) detected in this study were all closely related to the Bat-CoVs identified from bats in China suggests the possibility that bat coronaviruses have been introduced from China and other countries into South Korea, or vice versa. This also can indicate the migration of bats over borders between countries.</p>
<p id="Par13">In this study, the prevalence of coronavirus in Korean bat samples was 2.7% overall. The prevalence by sample type was 5.4% (13/332) for oral swabs, 1.8% (1/57) for carcasses, 1.6% (4/245) for fecal samples, and 0.0% (0/38) for urine samples. Reported rates from other countries for coronavirus prevalence in bats were 6.5% (64/985) and 5.3% (50/951) for China, 8.2% (16/195) for Italy, and 5.3% (32/606) for Mexico [<xref ref-type="bibr" rid="CR20">20</xref>
–<xref ref-type="bibr" rid="CR23">23</xref>
], not greatly different from our figure of 2.7% for prevalence in South Korea.</p>
<p id="Par14">Fourteen out of 24 Korean bat species were screened for CoVs in this study. The species positive for Bat-CoVs were <italic>R. ferrumequinum</italic>
, <italic>V. sinensis</italic>
, <italic>P. abramus</italic>
, and <italic>E. serotinus</italic>
. The Bat-CoVs that showed the highest nucleotide identity with our isolates were obtained from the same species that we identified as positive, except for <italic>E. serotinus</italic>
. To our knowledge, this is the first time a Bat-CoV has been detected from <italic>E. serotinus</italic>
in Asia. In Europe (Italy), a lineage C betacoronavirus was detected from <italic>E. serotinus</italic>
in 2014 [<xref ref-type="bibr" rid="CR24">24</xref>
].</p>
<p id="Par15">Bat-CoVs were usually detected at higher rates in alimentary samples (fecal samples, rectal swabs, and intestine) than in respiratory samples (oral and throat swabs) [<xref ref-type="bibr" rid="CR7">7</xref>
, <xref ref-type="bibr" rid="CR15">15</xref>
, <xref ref-type="bibr" rid="CR17">17</xref>
, <xref ref-type="bibr" rid="CR22">22</xref>
, <xref ref-type="bibr" rid="CR25">25</xref>
, <xref ref-type="bibr" rid="CR26">26</xref>
]. We collected alimentary and respiratory samples and urine samples. However, Bat-CoVs were not detected in urine samples. Animal coronaviruses usually produce either enteric or respiratory infections. Animal models show similar clinical features to SARS and MERS patients; the majority of whom presented with respiratory symptoms but in some cases also suffered from enteric complications [<xref ref-type="bibr" rid="CR27">27</xref>
]. Unlike other human coronavirus infections, a number of MERS cases were associated with acute renal failure. MERS-CoV replication in the human kidney suggests the potential of shedding viruses in urine [<xref ref-type="bibr" rid="CR28">28</xref>
]. Bat-CoV isolate Bat SL-CoV-WIV1 (KF367457) showed infectivity to <italic>Rhinolophus sinicus</italic>
kidney cell lines, which means it may be possible to detect Bat-CoV in urine [<xref ref-type="bibr" rid="CR6">6</xref>
].</p>
<p id="Par16">The current study revealed that Korean bats have SARS- and MERS-related Bat-CoVs, consistent with earlier work [<xref ref-type="bibr" rid="CR14">14</xref>
]. The previous study detected alpha- and betacoronaviruses only from fecal samples in four regions, two in Gangwon, one in Chungbuk, and one in Gyeongbuk [<xref ref-type="bibr" rid="CR14">14</xref>
]. The only betacoronavirus RdRp sequence Bat-CoV B15–21 (KU528590.1) was clustered with 13 Bat-CoVs (16BO122, 129, 132, 133, 134, 135, 139, 141, 143, 145, 150, 154, and 155) detected from Danyang, Chungbuk province. The identity between the 14 sequences was very high at 97.7–100%, even though the sample types and collection sites were different. The species of bat infected with Bat-CoV B15-21 was not specified in the paper, but the major bat species of the sample collection site was <italic>R. ferrumequinum</italic>
; the same species in which we detected 13 Bat-CoVs. The same Bat-CoVs were detected from fecal samples in the prior study [<xref ref-type="bibr" rid="CR14">14</xref>
] and from oral swabs in our study. Spike proteins, which are translated from spike genes, define viral tropism by receptor specificity and by membrane fusion activity during entry into cells [<xref ref-type="bibr" rid="CR29">29</xref>
]. Although the spike genes were not identified in this study, full spike gene analysis of Bat-CoV B15-21 suggested a low potential for human emergence. One MERS-like betacoronavirus, Bat-CoV B15-1-6 (KU528586.1, KU528585.1), was identified by Kim et al. [<xref ref-type="bibr" rid="CR14">14</xref>
], but the similarity of this isolate to our isolates could not be analyzed because the RdRp sequence was not obtained. High nucleotide identity between Bat-CoV B15-1-6 and Bat-CoV-SC2013 (KJ473821) suggests that Bat-CoV B15-1-6 and 16BT3 might be very similar.</p>
<p id="Par17">Bat-CoVs have been identified in many countries including the Australasian region [<xref ref-type="bibr" rid="CR10">10</xref>
, <xref ref-type="bibr" rid="CR11">11</xref>
, <xref ref-type="bibr" rid="CR14">14</xref>
–<xref ref-type="bibr" rid="CR16">16</xref>
, <xref ref-type="bibr" rid="CR20">20</xref>
–<xref ref-type="bibr" rid="CR26">26</xref>
, <xref ref-type="bibr" rid="CR30">30</xref>
, <xref ref-type="bibr" rid="CR31">31</xref>
]. But Bat-CoVs identified in Korea were genetically close to Bat-CoVs from China, a close neighbor of Korea. According to the results of Bat-CoV research in China, the degree of host restriction for coronaviruses in bat populations was high. For example, similar viruses were detected in the same species of bat in different regions, approximately 1600 km apart, while two different bat species in the same habitat had different coronaviruses [<xref ref-type="bibr" rid="CR22">22</xref>
]. In our results, three Bat-CoVs (16BF109, 211, and 244) from <italic>P. abramus</italic>
were clustered with each other, even though samples were collected from different habitats in different regions (Andong, Yeongdeok, and Gyeongju). The Bat-CoV detected from <italic>E. serotinus</italic>
bat in the metropolitan city Gwangju (16BF104) was also clustered with these three Bat-CoVs mentioned above. However, there was no matching virus for 16BF104 found in the same species of bat in other locations, nor in other species in the region where samples were collected. Our data could support the possibility of relationships between genetic variation, geographic locations where Bat-CoVs were isolated, and bat host species, but more data on Bat-CoVs in Korea would be needed to address this.</p>
<p id="Par18">In summary, the prevalence of coronavirus in Korean bats was determined and found to be comparable to or lower than the rates in other countries. We detected SARS-related and MERS-like Bat-CoVs that were genetically very similar to Bat-CoVs identified in China. For the study of Bat-CoV seasonal occurrence and transmission, continuous monitoring during all seasons is required, and ideally alimentary, respiratory, and other samples need to be collected from each bat. Future work to determine the complete genome sequences of Bat-CoVs from South Korea would give a more complete picture of their pathogenicity and the possibility of infectious spread to other animals and humans.</p>
</sec>
</body>
<back><ack><title>Acknowledgements</title>
<p>We thank Dr. C.W. Jeong and his colleagues for their efforts in the collection of wild bat carcasses and samples. This research was supported by grant no. 2016-01-01-033 from the NIER of the Republic of Korea. The funders had no roles in the study design, data collection and analysis, decision to publish, or the preparation of the manuscript.</p>
</ack>
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