Genetic Characterization of Middle East Respiratory Syndrome Coronavirus, South Korea, 2018
Identifieur interne : 000685 ( Pmc/Corpus ); précédent : 000684; suivant : 000686Genetic Characterization of Middle East Respiratory Syndrome Coronavirus, South Korea, 2018
Auteurs : Yoon-Seok Chung ; Jeong Min Kim ; Heui Man Kim ; Kye Ryeong Park ; Anna Lee ; Nam-Joo Lee ; Mi-Seon Kim ; Jun Sub Kim ; Chi-Kyeong Kim ; Jae In Lee ; Chun KangSource :
- Emerging Infectious Diseases [ 1080-6040 ] ; 2019.
Abstract
We evaluated genetic variation in Middle East respiratory syndrome coronavirus (MERS-CoV) imported to South Korea in 2018 using specimens from a patient and isolates from infected Caco-2 cells. The MERS-CoV strain in this study was genetically similar to a strain isolated in Riyadh, Saudi Arabia, in 2017.
Url:
DOI: 10.3201/eid2505.181534
PubMed: 30753126
PubMed Central: 6478226
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Genetic Characterization of Middle East Respiratory Syndrome Coronavirus, South Korea, 2018</title><author><name sortKey="Chung, Yoon Seok" sort="Chung, Yoon Seok" uniqKey="Chung Y" first="Yoon-Seok" last="Chung">Yoon-Seok Chung</name></author><author><name sortKey="Kim, Jeong Min" sort="Kim, Jeong Min" uniqKey="Kim J" first="Jeong Min" last="Kim">Jeong Min Kim</name></author><author><name sortKey="Man Kim, Heui" sort="Man Kim, Heui" uniqKey="Man Kim H" first="Heui" last="Man Kim">Heui Man Kim</name></author><author><name sortKey="Park, Kye Ryeong" sort="Park, Kye Ryeong" uniqKey="Park K" first="Kye Ryeong" last="Park">Kye Ryeong Park</name></author><author><name sortKey="Lee, Anna" sort="Lee, Anna" uniqKey="Lee A" first="Anna" last="Lee">Anna Lee</name></author><author><name sortKey="Lee, Nam Joo" sort="Lee, Nam Joo" uniqKey="Lee N" first="Nam-Joo" last="Lee">Nam-Joo Lee</name></author><author><name sortKey="Kim, Mi Seon" sort="Kim, Mi Seon" uniqKey="Kim M" first="Mi-Seon" last="Kim">Mi-Seon Kim</name></author><author><name sortKey="Kim, Jun Sub" sort="Kim, Jun Sub" uniqKey="Kim J" first="Jun Sub" last="Kim">Jun Sub Kim</name></author><author><name sortKey="Kim, Chi Kyeong" sort="Kim, Chi Kyeong" uniqKey="Kim C" first="Chi-Kyeong" last="Kim">Chi-Kyeong Kim</name></author><author><name sortKey="Lee, Jae In" sort="Lee, Jae In" uniqKey="Lee J" first="Jae In" last="Lee">Jae In Lee</name></author><author><name sortKey="Kang, Chun" sort="Kang, Chun" uniqKey="Kang C" first="Chun" last="Kang">Chun Kang</name></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">30753126</idno><idno type="pmc">6478226</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6478226</idno><idno type="RBID">PMC:6478226</idno><idno type="doi">10.3201/eid2505.181534</idno><date when="2019">2019</date><idno type="wicri:Area/Pmc/Corpus">000685</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">000685</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Genetic Characterization of Middle East Respiratory Syndrome Coronavirus, South Korea, 2018</title><author><name sortKey="Chung, Yoon Seok" sort="Chung, Yoon Seok" uniqKey="Chung Y" first="Yoon-Seok" last="Chung">Yoon-Seok Chung</name></author><author><name sortKey="Kim, Jeong Min" sort="Kim, Jeong Min" uniqKey="Kim J" first="Jeong Min" last="Kim">Jeong Min Kim</name></author><author><name sortKey="Man Kim, Heui" sort="Man Kim, Heui" uniqKey="Man Kim H" first="Heui" last="Man Kim">Heui Man Kim</name></author><author><name sortKey="Park, Kye Ryeong" sort="Park, Kye Ryeong" uniqKey="Park K" first="Kye Ryeong" last="Park">Kye Ryeong Park</name></author><author><name sortKey="Lee, Anna" sort="Lee, Anna" uniqKey="Lee A" first="Anna" last="Lee">Anna Lee</name></author><author><name sortKey="Lee, Nam Joo" sort="Lee, Nam Joo" uniqKey="Lee N" first="Nam-Joo" last="Lee">Nam-Joo Lee</name></author><author><name sortKey="Kim, Mi Seon" sort="Kim, Mi Seon" uniqKey="Kim M" first="Mi-Seon" last="Kim">Mi-Seon Kim</name></author><author><name sortKey="Kim, Jun Sub" sort="Kim, Jun Sub" uniqKey="Kim J" first="Jun Sub" last="Kim">Jun Sub Kim</name></author><author><name sortKey="Kim, Chi Kyeong" sort="Kim, Chi Kyeong" uniqKey="Kim C" first="Chi-Kyeong" last="Kim">Chi-Kyeong Kim</name></author><author><name sortKey="Lee, Jae In" sort="Lee, Jae In" uniqKey="Lee J" first="Jae In" last="Lee">Jae In Lee</name></author><author><name sortKey="Kang, Chun" sort="Kang, Chun" uniqKey="Kang C" first="Chun" last="Kang">Chun Kang</name></author></analytic><series><title level="j">Emerging Infectious Diseases</title><idno type="ISSN">1080-6040</idno><idno type="eISSN">1080-6059</idno><imprint><date when="2019">2019</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><p>We evaluated genetic variation in Middle East respiratory syndrome coronavirus (MERS-CoV) imported to South Korea in 2018 using specimens from a patient and isolates from infected Caco-2 cells. The MERS-CoV strain in this study was genetically similar to a strain isolated in Riyadh, Saudi Arabia, in 2017.</p></div></front><back><div1 type="bibliography"><listBibl><biblStruct></biblStruct><biblStruct></biblStruct><biblStruct></biblStruct><biblStruct></biblStruct><biblStruct></biblStruct><biblStruct></biblStruct><biblStruct></biblStruct><biblStruct></biblStruct><biblStruct></biblStruct><biblStruct></biblStruct><biblStruct></biblStruct><biblStruct></biblStruct></listBibl></div1></back></TEI><pmc article-type="brief-report"><pmc-dir>properties open_access</pmc-dir>
<front><journal-meta><journal-id journal-id-type="nlm-ta">Emerg Infect Dis</journal-id><journal-id journal-id-type="iso-abbrev">Emerging Infect. Dis</journal-id><journal-id journal-id-type="publisher-id">EID</journal-id><journal-title-group><journal-title>Emerging Infectious Diseases</journal-title></journal-title-group><issn pub-type="ppub">1080-6040</issn><issn pub-type="epub">1080-6059</issn><publisher><publisher-name>Centers for Disease Control and Prevention</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">30753126</article-id><article-id pub-id-type="pmc">6478226</article-id><article-id pub-id-type="publisher-id">18-1534</article-id><article-id pub-id-type="doi">10.3201/eid2505.181534</article-id><article-categories><subj-group subj-group-type="heading"><subject>Dispatch</subject></subj-group><subj-group subj-group-type="article-type"><subject>Dispatch</subject></subj-group><subj-group subj-group-type="TOC-title"><subject>Genetic Characterization of Middle East Respiratory Syndrome Coronavirus, South Korea, 2018</subject></subj-group></article-categories><title-group><article-title>Genetic Characterization of Middle East Respiratory Syndrome Coronavirus, South Korea, 2018</article-title><alt-title alt-title-type="running-head">Middle East Respiratory Syndrome, South Korea</alt-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>Chung</surname><given-names>Yoon-Seok</given-names></name></contrib><contrib contrib-type="author"><name><surname>Kim</surname><given-names>Jeong Min</given-names></name></contrib><contrib contrib-type="author"><name><surname>Man Kim</surname><given-names>Heui</given-names></name></contrib><contrib contrib-type="author"><name><surname>Park</surname><given-names>Kye Ryeong</given-names></name></contrib><contrib contrib-type="author"><name><surname>Lee</surname><given-names>Anna</given-names></name></contrib><contrib contrib-type="author"><name><surname>Lee</surname><given-names>Nam-Joo</given-names></name></contrib><contrib contrib-type="author"><name><surname>Kim</surname><given-names>Mi-Seon</given-names></name></contrib><contrib contrib-type="author"><name><surname>Kim</surname><given-names>Jun Sub</given-names></name></contrib><contrib contrib-type="author"><name><surname>Kim</surname><given-names>Chi-Kyeong</given-names></name></contrib><contrib contrib-type="author"><name><surname>Lee</surname><given-names>Jae In</given-names></name></contrib><contrib contrib-type="author" corresp="yes"><name><surname>Kang</surname><given-names>Chun</given-names></name></contrib><aff id="aff1">Korea Centers for Disease Control and Prevention, Cheongju, South Korea (Y.-S. Chung, J.M. Kim, H.M. Kim, K.R. Park, A. Lee, N.-J. Lee, M.-S. Kim, J.S. Kim, C.-K. Kim, C. Kang);</aff><aff id="aff2">Seoul Institute of Public Health and Environment, Seoul, South Korea (J.I. Lee)</aff></contrib-group><author-notes><corresp id="cor1">Address for correspondence: Chun Kang, Korea Centers for Disease Control and Prevention—Division of Viral Diseases, Center for Laboratory Control of Infectious Diseases, Korea 187, Osongsaengmyeong 2-ro, Osong-eup, Heungdeok-gu, Cheongju-si, Chungcheongbuk-do 28159, South Korea; email: <email xlink:href="kangchun@korea.kr">kangchun@korea.kr</email></corresp></author-notes><pub-date pub-type="ppub"><month>5</month><year>2019</year></pub-date><volume>25</volume><issue>5</issue><fpage>958</fpage><lpage>962</lpage><abstract><p>We evaluated genetic variation in Middle East respiratory syndrome coronavirus (MERS-CoV) imported to South Korea in 2018 using specimens from a patient and isolates from infected Caco-2 cells. The MERS-CoV strain in this study was genetically similar to a strain isolated in Riyadh, Saudi Arabia, in 2017.</p></abstract><kwd-group kwd-group-type="author"><title>Keywords: </title><kwd>Middle East respiratory syndrome</kwd><kwd>coronavirus</kwd><kwd>Caco-2 cells</kwd><kwd>throat swab</kwd><kwd>sputum</kwd><kwd><italic>S</italic> gene</kwd><kwd>spike gene</kwd><kwd>viruses</kwd><kwd>South Korea</kwd></kwd-group></article-meta></front><body><p>Between 2012 and the end of August 2018, a total of 2,248 laboratory-confirmed cases of Middle East respiratory syndrome coronavirus (MERS-CoV) infection and 798 associated deaths (case-fatality rate 35.3%) were reported in 27 countries (<xref rid="R1" ref-type="bibr"><italic>1</italic></xref>). Most of these cases (83%) were reported in Saudi Arabia (1,871 cases, including 724 related deaths, for a case-fatality rate of 38.7%). </p><p>The 2015 MERS-CoV outbreak in South Korea resulted in 186 laboratory-confirmed cases and 38 deaths. MERS-CoV spread via intrahospital and interhospital transmission at 16 clinics and hospitals across South Korea (<xref rid="R2" ref-type="bibr"><italic>2</italic></xref>). This outbreak was recorded as the largest MERS outbreak outside of the Middle East (<xref rid="R3" ref-type="bibr"><italic>3</italic></xref>). </p><p>In August 2018, eight laboratory-confirmed cases of MERS-CoV infection were reported in Saudi Arabia, with 4 associated deaths; 1 case in a person who had travel history to the Arabian Peninsula was reported in the United Kingdom (<xref rid="R4" ref-type="bibr"><italic>4</italic></xref>). In September 2018, a man in South Korea with a history of travel to the Middle East became ill and was suspected of having MERS-CoV infection. We report the investigation of this case and genetic characterization of the virus on the basis of variation and phylogenetic analyses of the spike (S) gene and the full-length genome from patient specimens and isolates from Caco-2 cells.</p><sec sec-type="other1"><title>The Study</title><p>On September 7, 2018, a 61-year-old man who had moved from Kuwait to South Korea visited the hospital with diarrhea and fever (<xref rid="R5" ref-type="bibr"><italic>5</italic></xref>). The patient had a history of visiting the Middle East and was suspected of MERS-CoV infection; accordingly, he was transferred to a hospital with a national isolation ward.</p><p>On September 8, we collected nasopharyngeal swab and sputum samples from the patient and transported them to the Seoul Provincial Institute of Public Health and Environment (Seoul, South Korea). Real-time reverse transcription PCR showed that the sputum was positive for the upstream regions of the E protein (<italic>upE</italic>) and <italic>orf1a</italic> genes (<xref rid="R6" ref-type="bibr"><italic>6</italic></xref>). Later the same day, we collected nasopharyngeal swab, throat swab, and sputum samples from the patient for further confirmation. The Korea Centers for Disease Control and Prevention (KCDC) confirmed that throat swabs and sputum samples were positive for <italic>upE</italic> and <italic>orf1a</italic>.</p><p>We added throat swab and sputum samples from the patient to a monolayer of Caco-2, Huh 7, and Vero E6 cells, which we incubated at 37°C in 5% CO<sub>2</sub>. We observed a cytopathic effect on the third day after inoculation in Caco-2 cells and confirmed viral replication of MERS-CoV in the supernatant of the infected cells by real-time reverse transcription PCR.</p><p>We extracted viral RNA from the specimens and the supernatant of the Caco-2 cells using the Viral RNA Mini Kit (QIAGEN, <ext-link ext-link-type="uri" xlink:href="http://www.qiagen.com">http://www.qiagen.com</ext-link>). We performed cDNA synthesis using the Superscript IV First-Strand synthesis system (Thermo Fisher Scientific, <ext-link ext-link-type="uri" xlink:href="http://www.thermofisher.com">http://www.thermofisher.com</ext-link>) with random hexamers. We amplified cDNA by overlapping PCR to generate products of 600–1,100 bp covering the entire S gene and the full-length genome; we sequenced the resulting PCR amplicons by Sanger sequencing using an ABI 3730 Analyzer (Applied Biosystems, <ext-link ext-link-type="uri" xlink:href="http://www.thermofisher.com">http://www.thermofisher.com</ext-link>).</p><p>We used ClustalW (<ext-link ext-link-type="uri" xlink:href="http://www.clustal.org">http://www.clustal.org</ext-link>) to align the S gene sequences of the isolates from the patient, MERS-CoV/KOR/KCDC/001_2018/SP-1 (from sputum sample), TS-1 (from throat swab sample), and TSVi (from Caco-2 processing), with those of 157 other MERS-CoV strains from GenBank and the MERS-CoV sequence database (<ext-link ext-link-type="uri" xlink:href="https://www.ncbi.nlm.nih.gov/genomes/VirusVariation/Database/nph-select.cgi?cmd=database&taxid=1335626">https://www.ncbi.nlm.nih.gov/genomes/VirusVariation/Database/nph-select.cgi?cmd=database&taxid=1335626</ext-link>), deposited up to August 2018. We sequenced and analyzed the full-length genome of MERS-CoV/KOR/KCDC/001_2018/TSVi and 39 other MERS-CoV strains. We constructed phylogenetic trees by the maximum-likelihood method with 1,000 bootstrap replicates using MEGA7 (<xref rid="R7" ref-type="bibr"><italic>7</italic></xref>) and RAxML (<ext-link ext-link-type="uri" xlink:href="https://github.com/stamatak/standard-RAxML">https://github.com/stamatak/standard-RAxML</ext-link>). We constructed phylogenetic trees from the MERS-CoV S genes (4,062 bp) (<xref ref-type="fig" rid="F1">Figure 1</xref>) and the full-length genome (30,150 bp) of the virus (<xref ref-type="fig" rid="F2">Figure 2</xref>) obtained from the patient in this study and the most similar human MERS-CoV sequences from other countries (<xref rid="R4" ref-type="bibr"><italic>4</italic></xref>).</p><fig id="F1" fig-type="figure" position="float"><label>Figure 1</label><caption><p>Molecular phylogenetic tree and coding region variants for the spike (S) glycoprotein gene of MERS-CoV isolates from South Korea, September 2018, and reference sequences. Phylogenetic analysis of 157 <italic>S</italic> sequences was performed using MEGA7 (<ext-link ext-link-type="uri" xlink:href="https://www.megasoftware.net">https://www.megasoftware.net</ext-link>), with tree visualization using FigTree version 1.4.3 (<ext-link ext-link-type="uri" xlink:href="http://tree.bio.ed.ac.uk/software/figtree">http://tree.bio.ed.ac.uk/software/figtree</ext-link>). The taxonomic positions of circulating strains from the outbreak in South Korea and Riyadh, Saudi Arabia, are indicated. Boldface indicates compressed major clades of MERS-CoV. Bootstrap values (>70%) on nodes are shown as percentages based on 1,000 replicates. Red indicates South Korea 2018 isolates, blue indicates South Korea 2015 isolates, and green indicates Saudi Arabia 2017 isolates. The highlighted strain, from 2012, is the prototype strain used as the reference. EMC, Erasmus Medical Center; MERS-CoV, Middle East respiratory syndrome coronavirus. Scale bar indicates nucleotide substitutions per site.</p></caption><graphic xlink:href="18-1534-F1"></graphic></fig><fig id="F2" fig-type="figure" position="float"><label>Figure 2</label><caption><p>Maximum-likelihood tree showing MERS-CoV isolates from South Korea, September 2018 (black dot), and reference MERS-CoV genomes. Tree estimated using RAxML values (<ext-link ext-link-type="uri" xlink:href="https://github.com/stamatak/standard-RAxML">https://github.com/stamatak/standard-RAxML</ext-link>) on branches are shown as percentages based on 1,000 bootstrap replicates from the nucleotide sequences. MERS-CoV, Middle East respiratory syndrome coronavirus. Scale bar indicates nucleotide substitutions per site.</p></caption><graphic xlink:href="18-1534-F2"></graphic></fig><p>We submitted viral S gene sequences MERS-CoV/KOR/KCDC/001_2018_SP-1, TS-1, TSVi from the patient to GenBank under accession nos. MH978886, MH978887, and MH978888. MERS-CoV/KOR/KCDC/001_2018 SP-1, TS, and TSVi were most closely related (99.85%–99.90% nucleotide identity) to a human MERS-CoV strain isolated in Riyadh, Saudi Arabia, in 2017 (Hu-Riyadh-KSA-9730_2017; GenBank accession no. MG912608). KOR/KCDC/2018 SP-1 and TS had 5 nucleotide substitutions (C309T, T519C, C2928T, T3375C, and T3598C) compared with a MERS-CoV strain found in Riyadh in 2017, whereas MERS-CoV/KOR/KCDC/001_2018 TSVi had 3 nucleotide substitutions (C309T, C2928T, and T3375C) compared with the same strain. There were no substitutions in the N terminal domain (NTD) and receptor-binding domain (RBD) of the S gene in the same comparison (<xref rid="T1" ref-type="table">Table</xref>). We submitted the full-length genome sequences from MERS-CoV/KOR/KCDC/001_2018_TSVi, obtained from cell isolates, to GenBank under accession no. MK129253. In a phylogenetic analysis, the virus was located in a lineage of locally endemic 2016 and 2017 Saudi Arabia strains (lineage 5 in <xref ref-type="fig" rid="F2">Figure 2</xref>) but was distinguished from 2015 South Korea strains.</p><table-wrap id="T1" position="float"><label>Table</label><caption><title>Comparison of spike glycoprotein gene sequence variants for a MERS-CoV isolates from a patient in South Korea, 2018, and reference strains*</title></caption><table frame="hsides" rules="groups"><col width="189" span="1"></col><col width="31" span="1"></col><col width="31" span="1"></col><col width="27" span="1"></col><col width="9" span="1"></col><col width="31" span="1"></col><col width="31" span="1"></col><col width="27" span="1"></col><col width="9" span="1"></col><col width="31" span="1"></col><col width="31" span="1"></col><col width="32" span="1"></col><thead><tr><th rowspan="3" valign="bottom" align="left" scope="col" colspan="1">MERS-CoV strain<hr></hr></th><th valign="bottom" colspan="11" align="center" scope="colgroup" rowspan="1">Nucleotide (amino acid) positions</th></tr></thead><tbody><tr><td valign="bottom" colspan="3" align="center" scope="row" rowspan="1">NTD<hr></hr></td><td rowspan="2" valign="bottom" align="left" colspan="1"><hr></hr></td><td valign="bottom" colspan="3" align="center" rowspan="1">RBD<hr></hr></td><td rowspan="2" valign="bottom" align="left" colspan="1"><hr></hr></td><td valign="bottom" colspan="3" align="center" rowspan="1">Other regions<hr></hr></td></tr><tr><td valign="bottom" colspan="1" align="center" scope="row" rowspan="1">183 (61)<hr></hr></td><td valign="bottom" align="center" rowspan="1" colspan="1">258 (86)<hr></hr></td><td valign="bottom" align="center" rowspan="1" colspan="1">409 (137)<hr></hr></td><td valign="bottom" colspan="1" align="center" rowspan="1">1586 (529)<hr></hr></td><td valign="bottom" align="center" rowspan="1" colspan="1">1588 (530)<hr></hr></td><td valign="bottom" align="center" rowspan="1" colspan="1">1848 (616)<hr></hr></td><td valign="bottom" colspan="1" align="center" rowspan="1">1886 (629)<hr></hr></td><td valign="bottom" align="center" rowspan="1" colspan="1">3177 (1059)<hr></hr></td><td valign="bottom" align="center" rowspan="1" colspan="1">3267 (1089)<hr></hr></td></tr><tr><td valign="top" align="left" scope="row" rowspan="1" colspan="1">JX869059_HCoV-EMC_2012†</td><td valign="top" align="center" rowspan="1" colspan="1">C (G)</td><td valign="top" align="center" rowspan="1" colspan="1">T (V)</td><td valign="top" align="center" rowspan="1" colspan="1">A (S)</td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="center" rowspan="1" colspan="1">T (I)</td><td valign="top" align="center" rowspan="1" colspan="1">G (V)</td><td valign="top" align="center" rowspan="1" colspan="1">T (V)</td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="center" rowspan="1" colspan="1">G (R)</td><td valign="top" align="center" rowspan="1" colspan="1">T (D)</td><td valign="top" align="center" rowspan="1" colspan="1">C (S)</td></tr><tr><td valign="top" align="left" scope="row" rowspan="1" colspan="1">KR011266_KSA_Hu/Riyadh-KSA-2049/2015</td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="center" rowspan="1" colspan="1">C (V)</td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td></tr><tr><td valign="top" align="left" scope="row" rowspan="1" colspan="1">KR011263_KSA_Hu/Riyadh-KSA-2345/2015</td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="center" rowspan="1" colspan="1">C (V)</td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td></tr><tr><td valign="top" align="left" scope="row" rowspan="1" colspan="1">KR011264_KSA_Hu/Riyadh-KSA-2343/2015</td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="center" rowspan="1" colspan="1">C (V)</td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td></tr><tr><td valign="top" align="left" scope="row" rowspan="1" colspan="1">KR011265_KSA_Hu/Riyadh-KSA-2466/2015</td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="center" rowspan="1" colspan="1">C (V)</td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td></tr><tr><td valign="top" align="left" scope="row" rowspan="1" colspan="1">KT026453_KSA_Hu/Riyadh-KSA-2959/2015</td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="center" rowspan="1" colspan="1">C (V)</td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td></tr><tr><td valign="top" align="left" scope="row" rowspan="1" colspan="1">KT026454_KSA_Hu/Riyadh_KSA_4050/2015</td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="center" rowspan="1" colspan="1">C (V)</td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td></tr><tr><td valign="top" align="left" scope="row" rowspan="1" colspan="1">KX154690_Hu_Jeddah-KSA-161RS1146_2016</td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="center" rowspan="1" colspan="1">C (V)</td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td></tr><tr><td valign="top" align="left" scope="row" rowspan="1" colspan="1">KX154684_Hu-Riyadh-KSA-11739_2016</td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="center" rowspan="1" colspan="1">C (V)</td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td></tr><tr><td valign="top" align="left" scope="row" rowspan="1" colspan="1">KX154694_Hu-Artawiyah-KSA-13328_2016</td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="center" rowspan="1" colspan="1">C (V)</td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td></tr><tr><td valign="top" align="left" scope="row" rowspan="1" colspan="1">MG011361_Hu-Riyadh-KSA-K17000405_2017</td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="center" rowspan="1" colspan="1">C (V)</td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td></tr><tr><td valign="top" align="left" scope="row" rowspan="1" colspan="1">MG011360_Hu-Riyadh-KSA-K17000887_2017</td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="center" rowspan="1" colspan="1">C (V)</td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td></tr><tr><td valign="top" align="left" scope="row" rowspan="1" colspan="1"><bold>MG912608_Hu-Riyadh-KSA-9730_2017</bold></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="center" rowspan="1" colspan="1">C (V)</td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td></tr><tr><td valign="top" align="left" scope="row" rowspan="1" colspan="1">MERS-CoV/KOR/KNIH/001_05_2015</td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="center" rowspan="1" colspan="1">C (V)</td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="center" rowspan="1" colspan="1">C (T)</td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="center" rowspan="1" colspan="1">C (D)</td><td valign="top" align="center" rowspan="1" colspan="1">T (S)</td></tr><tr><td valign="top" align="left" scope="row" rowspan="1" colspan="1">KT029139-MERS-CoV/KOR/KNIH/002_05_2015</td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="center" rowspan="1" colspan="1">C (V)</td><td valign="top" align="center" rowspan="1" colspan="1">C (R)</td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="center" rowspan="1" colspan="1">C (L)</td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="center" rowspan="1" colspan="1">C (D)</td><td valign="top" align="center" rowspan="1" colspan="1">T (S)</td></tr><tr><td valign="top" align="left" scope="row" rowspan="1" colspan="1">MERS-CoV/KOR/KNIH/009_05_2015</td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="center" rowspan="1" colspan="1">C (V)</td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="center" rowspan="1" colspan="1">C (V)</td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="center" rowspan="1" colspan="1">C (D)</td><td valign="top" align="center" rowspan="1" colspan="1">T (S)</td></tr><tr><td valign="top" align="left" scope="row" rowspan="1" colspan="1">KT006149-ChinaGD01_2015</td><td valign="top" align="center" rowspan="1" colspan="1">G (G)</td><td valign="top" align="center" rowspan="1" colspan="1">C (V)</td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="center" rowspan="1" colspan="1">C (V)</td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="center" rowspan="1" colspan="1">C (D)</td><td valign="top" align="center" rowspan="1" colspan="1">T (S)</td></tr><tr><td valign="top" align="left" scope="row" rowspan="1" colspan="1">MERS-CoV/KOR/KNIH/012_05_2015</td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="center" rowspan="1" colspan="1">C (V)</td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="center" rowspan="1" colspan="1">C (T)</td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="center" rowspan="1" colspan="1">C (V)</td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="center" rowspan="1" colspan="1">C (D)</td><td valign="top" align="center" rowspan="1" colspan="1">T (S)</td></tr><tr><td valign="top" align="left" scope="row" rowspan="1" colspan="1">MERS-CoV/KOR/KNIH/013_05_2015</td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="center" rowspan="1" colspan="1">C (V)</td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="center" rowspan="1" colspan="1">C (T)</td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="center" rowspan="1" colspan="1">C (V)</td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="center" rowspan="1" colspan="1">C (D)</td><td valign="top" align="center" rowspan="1" colspan="1">T (S)</td></tr><tr><td valign="top" align="left" scope="row" rowspan="1" colspan="1">MERS-CoV/KOR/KNIH/015_05_2015</td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="center" rowspan="1" colspan="1">C (V)</td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="center" rowspan="1" colspan="1">C (T)</td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="center" rowspan="1" colspan="1">C (V)</td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="center" rowspan="1" colspan="1">A (H)</td><td valign="top" align="center" rowspan="1" colspan="1">C (D)</td><td valign="top" align="center" rowspan="1" colspan="1">T (S)</td></tr><tr><td valign="top" align="left" scope="row" rowspan="1" colspan="1">MERS-CoV/KOR/KNIH/042_04_2015</td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="center" rowspan="1" colspan="1">C (V)</td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="center" rowspan="1" colspan="1">C (D)</td><td valign="top" align="center" rowspan="1" colspan="1">T (S)</td></tr><tr><td valign="top" align="left" scope="row" rowspan="1" colspan="1"><bold>MERS-CoV/KOR/KCDC/001_2018_2SP-1</bold></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="center" rowspan="1" colspan="1">C (V)</td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td></tr><tr><td valign="top" align="left" scope="row" rowspan="1" colspan="1"><bold>MERS-CoV/KOR/KCDC/001_2018_4TS</bold></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="center" rowspan="1" colspan="1">C (V)</td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td></tr><tr><td valign="top" align="left" scope="row" rowspan="1" colspan="1"><bold>MERS-CoV/KOR/KCDC/001_2018_4TSVi</bold></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="center" rowspan="1" colspan="1">C (V)</td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td><td valign="top" align="left" rowspan="1" colspan="1"></td></tr></tbody></table><table-wrap-foot><p>*Only variations from the reference strain are shown. Boldface indicates the South Korea isolates and the most similar strain identified in this study. MERS-CoV, Middle East respiratory syndrome coronavirus; NTD, N-terminal domain; RBD, receptor-binding domain.
†Reference MERS-CoV strain.</p></table-wrap-foot></table-wrap></sec><sec sec-type="conclusions"><title>Conclusions</title><p>We characterized the S gene and full-length genome of MERS-CoV imported to South Korea from the Middle East using sputum and throat swab specimens from a patient and from Caco-2 cells exposed to throat swab samples from the patient (<xref rid="R8" ref-type="bibr"><italic>8</italic></xref><italic>,</italic><xref rid="R9" ref-type="bibr"><italic>9</italic></xref>). A comparative genetic analysis of 157 strains isolated in 27 countries including South Korea demonstrated that the imported MERS-CoV we isolated showed the highest identity (99.85%–99.90%) with a strain recently isolated in Saudi Arabia in 2017 (<xref rid="R1" ref-type="bibr"><italic>1</italic></xref><italic>,</italic><xref rid="R10" ref-type="bibr"><italic>10</italic></xref>). These strains differed at 2 positions (C309T and T519C). We detected no variation in NTD or RBD, which are the major functional sites of the S protein (<xref rid="R11" ref-type="bibr"><italic>11</italic></xref>). In addition, the strains involved in the outbreak in South Korea in 2015 had 12 nt substitutions (NTD, 1 site; RBD, 2 or 3 sites), implying that the imported case in 2018 involved a different virus (<xref rid="R4" ref-type="bibr"><italic>4</italic></xref>).</p><p>Despite 110 laboratory-confirmed cases of MERS-CoV reported globally during 2018, no genetic information has been obtained to date. Therefore, we could not compare the genetic relationships between the strain we isolated and MERS-CoV strains in the Middle East (<xref rid="R12" ref-type="bibr"><italic>12</italic></xref>).</p><p>In summary, we obtained genetic information about a MERS-CoV strain in South Korea in 2018 that was probably imported from the Middle East. We expect the sequence data we identified to support future epidemiologic investigations of MERS-CoV, particularly to fill the need for recent data. Furthermore, the results of this study improve our understanding of the evolution of MERS-CoV and highlight the need for enhanced surveillance, especially for persons traveling to the Middle East.</p></sec></body><back><fn-group><fn fn-type="citation"><p><italic>Suggested citation for this article</italic>: Chung Y-S, Kim JM, Kim HM, Park KR, Lee A, Lee N-J, et al. Genetic characterization of Middle East respiratory syndrome coronavirus, South Korea, 2018. Emerg Infect Dis. 2019 May [<italic>date cited</italic>]. <ext-link ext-link-type="uri" xlink:href="https://doi.org/10.3201/eid2505.181534">https://doi.org/10.3201/eid2505.181534</ext-link></p></fn></fn-group><ack><p>This research was supported by a fund (4834-303-210-13) of the Korea Centers for Disease Control and Prevention.</p><p>Author contributions: Y.S.C. and C.K. designed the study; J.I.L., N.-J.L., M.-S.K., and A.L collected samples and contributed to diagnosis; J.M.K., H.M.K., and K.R.P. performed sequencing; J.M.K., H.M.K., and J.S.K. analyzed data; J.M.K., H.M.K., and Y.-S.C. prepared the table and figures; and J.M.K., H.M.K., and Y.-S.C. wrote the article.</p></ack><bio id="d35e837"><p>Dr. Chung is a deputy director at the Division of Viral Diseases, Korea Centers for Disease Control and Prevention, Cheongju, South Korea. 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