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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Inoculation of Goats, Sheep, and Horses with MERS-CoV Does Not Result in Productive Viral Shedding</title><author><name sortKey="Adney, Danielle R" sort="Adney, Danielle R" uniqKey="Adney D" first="Danielle R." last="Adney">Danielle R. Adney</name><affiliation><nlm:aff id="af1-viruses-08-00230">Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, CO 80521, USA;<email>danielle.adney@colostate.edu</email> (D.R.A.);<email>vienna.brown@colostate.edu</email> (V.R.B.)</nlm:aff></affiliation></author><author><name sortKey="Brown, Vienna R" sort="Brown, Vienna R" uniqKey="Brown V" first="Vienna R." last="Brown">Vienna R. Brown</name><affiliation><nlm:aff id="af1-viruses-08-00230">Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, CO 80521, USA;<email>danielle.adney@colostate.edu</email> (D.R.A.);<email>vienna.brown@colostate.edu</email> (V.R.B.)</nlm:aff></affiliation></author><author><name sortKey="Porter, Stephanie M" sort="Porter, Stephanie M" uniqKey="Porter S" first="Stephanie M." last="Porter">Stephanie M. Porter</name><affiliation><nlm:aff id="af2-viruses-08-00230">Department of Biomedical Sciences, Colorado State University, Fort Collins, CO 80523, USA;<email>stephanie.porter@colostate.edu</email> (S.M.P.);<email>airn.hartwig@colostate.edu</email> (A.E.H.)</nlm:aff></affiliation></author><author><name sortKey="Bielefeldt Ohmann, Helle" sort="Bielefeldt Ohmann, Helle" uniqKey="Bielefeldt Ohmann H" first="Helle" last="Bielefeldt-Ohmann">Helle Bielefeldt-Ohmann</name><affiliation><nlm:aff id="af3-viruses-08-00230">School of Veterinary Science, University of Queensland, Gatton, QLD 4343, Australia;<email>h.bielefeldtohmann1@uq.edu.au</email></nlm:aff></affiliation></author><author><name sortKey="Hartwig, Airn E" sort="Hartwig, Airn E" uniqKey="Hartwig A" first="Airn E." last="Hartwig">Airn E. Hartwig</name><affiliation><nlm:aff id="af2-viruses-08-00230">Department of Biomedical Sciences, Colorado State University, Fort Collins, CO 80523, USA;<email>stephanie.porter@colostate.edu</email> (S.M.P.);<email>airn.hartwig@colostate.edu</email> (A.E.H.)</nlm:aff></affiliation></author><author><name sortKey="Bowen, Richard A" sort="Bowen, Richard A" uniqKey="Bowen R" first="Richard A." last="Bowen">Richard A. Bowen</name><affiliation><nlm:aff id="af1-viruses-08-00230">Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, CO 80521, USA;<email>danielle.adney@colostate.edu</email> (D.R.A.);<email>vienna.brown@colostate.edu</email> (V.R.B.)</nlm:aff></affiliation><affiliation><nlm:aff id="af2-viruses-08-00230">Department of Biomedical Sciences, Colorado State University, Fort Collins, CO 80523, USA;<email>stephanie.porter@colostate.edu</email> (S.M.P.);<email>airn.hartwig@colostate.edu</email> (A.E.H.)</nlm:aff></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">27548203</idno><idno type="pmc">4997592</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4997592</idno><idno type="RBID">PMC:4997592</idno><idno type="doi">10.3390/v8080230</idno><date when="2016">2016</date><idno type="wicri:Area/Pmc/Corpus">001205</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">001205</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Inoculation of Goats, Sheep, and Horses with MERS-CoV Does Not Result in Productive Viral Shedding</title><author><name sortKey="Adney, Danielle R" sort="Adney, Danielle R" uniqKey="Adney D" first="Danielle R." last="Adney">Danielle R. Adney</name><affiliation><nlm:aff id="af1-viruses-08-00230">Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, CO 80521, USA;<email>danielle.adney@colostate.edu</email> (D.R.A.);<email>vienna.brown@colostate.edu</email> (V.R.B.)</nlm:aff></affiliation></author><author><name sortKey="Brown, Vienna R" sort="Brown, Vienna R" uniqKey="Brown V" first="Vienna R." last="Brown">Vienna R. Brown</name><affiliation><nlm:aff id="af1-viruses-08-00230">Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, CO 80521, USA;<email>danielle.adney@colostate.edu</email> (D.R.A.);<email>vienna.brown@colostate.edu</email> (V.R.B.)</nlm:aff></affiliation></author><author><name sortKey="Porter, Stephanie M" sort="Porter, Stephanie M" uniqKey="Porter S" first="Stephanie M." last="Porter">Stephanie M. Porter</name><affiliation><nlm:aff id="af2-viruses-08-00230">Department of Biomedical Sciences, Colorado State University, Fort Collins, CO 80523, USA;<email>stephanie.porter@colostate.edu</email> (S.M.P.);<email>airn.hartwig@colostate.edu</email> (A.E.H.)</nlm:aff></affiliation></author><author><name sortKey="Bielefeldt Ohmann, Helle" sort="Bielefeldt Ohmann, Helle" uniqKey="Bielefeldt Ohmann H" first="Helle" last="Bielefeldt-Ohmann">Helle Bielefeldt-Ohmann</name><affiliation><nlm:aff id="af3-viruses-08-00230">School of Veterinary Science, University of Queensland, Gatton, QLD 4343, Australia;<email>h.bielefeldtohmann1@uq.edu.au</email></nlm:aff></affiliation></author><author><name sortKey="Hartwig, Airn E" sort="Hartwig, Airn E" uniqKey="Hartwig A" first="Airn E." last="Hartwig">Airn E. Hartwig</name><affiliation><nlm:aff id="af2-viruses-08-00230">Department of Biomedical Sciences, Colorado State University, Fort Collins, CO 80523, USA;<email>stephanie.porter@colostate.edu</email> (S.M.P.);<email>airn.hartwig@colostate.edu</email> (A.E.H.)</nlm:aff></affiliation></author><author><name sortKey="Bowen, Richard A" sort="Bowen, Richard A" uniqKey="Bowen R" first="Richard A." last="Bowen">Richard A. Bowen</name><affiliation><nlm:aff id="af1-viruses-08-00230">Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, CO 80521, USA;<email>danielle.adney@colostate.edu</email> (D.R.A.);<email>vienna.brown@colostate.edu</email> (V.R.B.)</nlm:aff></affiliation><affiliation><nlm:aff id="af2-viruses-08-00230">Department of Biomedical Sciences, Colorado State University, Fort Collins, CO 80523, USA;<email>stephanie.porter@colostate.edu</email> (S.M.P.);<email>airn.hartwig@colostate.edu</email> (A.E.H.)</nlm:aff></affiliation></author></analytic><series><title level="j">Viruses</title><idno type="eISSN">1999-4915</idno><imprint><date when="2016">2016</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><p>The Middle East respiratory syndrome coronavirus (MERS-CoV) was first recognized in 2012 and can cause severe disease in infected humans. Dromedary camels are the reservoir for the virus, although, other than nasal discharge, these animals do not display any overt clinical disease. Data from in vitro experiments suggest that other livestock such as sheep, goats, and horses might also contribute to viral transmission, although field data has not identified any seropositive animals. In order to understand if these animals could be infected, we challenged young goats and horses and adult sheep with MERS-CoV by intranasal inoculation. Minimal or no virus shedding was detected in all of the animals. During the four weeks following inoculation, neutralizing antibodies were detected in the young goats, but not in sheep or horses.</p></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Zaki, A" uniqKey="Zaki A">A. 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<front><journal-meta><journal-id journal-id-type="nlm-ta">Viruses</journal-id><journal-id journal-id-type="iso-abbrev">Viruses</journal-id><journal-id journal-id-type="publisher-id">viruses</journal-id><journal-title-group><journal-title>Viruses</journal-title></journal-title-group><issn pub-type="epub">1999-4915</issn><publisher><publisher-name>MDPI</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">27548203</article-id><article-id pub-id-type="pmc">4997592</article-id><article-id pub-id-type="doi">10.3390/v8080230</article-id><article-id pub-id-type="publisher-id">viruses-08-00230</article-id><article-categories><subj-group subj-group-type="heading"><subject>Article</subject></subj-group></article-categories><title-group><article-title>Inoculation of Goats, Sheep, and Horses with MERS-CoV Does Not Result in Productive Viral Shedding</article-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>Adney</surname><given-names>Danielle R.</given-names></name><xref ref-type="aff" rid="af1-viruses-08-00230">1</xref></contrib><contrib contrib-type="author"><name><surname>Brown</surname><given-names>Vienna R.</given-names></name><xref ref-type="aff" rid="af1-viruses-08-00230">1</xref></contrib><contrib contrib-type="author"><name><surname>Porter</surname><given-names>Stephanie M.</given-names></name><xref ref-type="aff" rid="af2-viruses-08-00230">2</xref></contrib><contrib contrib-type="author"><name><surname>Bielefeldt-Ohmann</surname><given-names>Helle</given-names></name><xref ref-type="aff" rid="af3-viruses-08-00230">3</xref></contrib><contrib contrib-type="author"><name><surname>Hartwig</surname><given-names>Airn E.</given-names></name><xref ref-type="aff" rid="af2-viruses-08-00230">2</xref></contrib><contrib contrib-type="author"><name><surname>Bowen</surname><given-names>Richard A.</given-names></name><xref ref-type="aff" rid="af1-viruses-08-00230">1</xref><xref ref-type="aff" rid="af2-viruses-08-00230">2</xref><xref rid="c1-viruses-08-00230" ref-type="corresp">*</xref></contrib></contrib-group><contrib-group><contrib contrib-type="editor"><name><surname>Mehle</surname><given-names>Andrew</given-names></name><role>Academic Editor</role></contrib></contrib-group><aff id="af1-viruses-08-00230"><label>1</label>Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, CO 80521, USA;<email>danielle.adney@colostate.edu</email> (D.R.A.);<email>vienna.brown@colostate.edu</email> (V.R.B.)</aff><aff id="af2-viruses-08-00230"><label>2</label>Department of Biomedical Sciences, Colorado State University, Fort Collins, CO 80523, USA;<email>stephanie.porter@colostate.edu</email> (S.M.P.);<email>airn.hartwig@colostate.edu</email> (A.E.H.)</aff><aff id="af3-viruses-08-00230"><label>3</label>School of Veterinary Science, University of Queensland, Gatton, QLD 4343, Australia;<email>h.bielefeldtohmann1@uq.edu.au</email></aff><author-notes><corresp id="c1-viruses-08-00230"><label>*</label>Correspondence: <email>Richard.Bowen@colostate.edu</email>; Tel.: +1-970-491-5768</corresp></author-notes><pub-date pub-type="epub"><day>19</day><month>8</month><year>2016</year></pub-date><pub-date pub-type="collection"><month>8</month><year>2016</year></pub-date><volume>8</volume><issue>8</issue><elocation-id>230</elocation-id><history><date date-type="received"><day>17</day><month>6</month><year>2016</year></date><date date-type="accepted"><day>13</day><month>8</month><year>2016</year></date></history><permissions><copyright-statement>© 2016 by the authors; licensee MDPI, Basel, Switzerland.</copyright-statement><copyright-year>2016</copyright-year><license><license-p><pmc-comment>CREATIVE COMMONS</pmc-comment>This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license (<ext-link ext-link-type="uri" xlink:href="http://creativecommons.org/licenses/by/4.0/">http://creativecommons.org/licenses/by/4.0/</ext-link>).</license-p></license></permissions><abstract><p>The Middle East respiratory syndrome coronavirus (MERS-CoV) was first recognized in 2012 and can cause severe disease in infected humans. Dromedary camels are the reservoir for the virus, although, other than nasal discharge, these animals do not display any overt clinical disease. Data from in vitro experiments suggest that other livestock such as sheep, goats, and horses might also contribute to viral transmission, although field data has not identified any seropositive animals. In order to understand if these animals could be infected, we challenged young goats and horses and adult sheep with MERS-CoV by intranasal inoculation. Minimal or no virus shedding was detected in all of the animals. During the four weeks following inoculation, neutralizing antibodies were detected in the young goats, but not in sheep or horses.</p></abstract><kwd-group><kwd>MERS</kwd><kwd>horse</kwd><kwd>goat</kwd><kwd>sheep</kwd><kwd>reservoir host</kwd></kwd-group></article-meta></front><body><sec id="sec1-viruses-08-00230"><title>1. Introduction</title><p>The Middle East respiratory syndrome coronavirus (MERS-CoV) is an emerging pathogen first described from Saudi Arabia in 2012 [<xref rid="B1-viruses-08-00230" ref-type="bibr">1</xref>] that can cause severe respiratory disease and death in roughly 36% of infected humans [<xref rid="B2-viruses-08-00230" ref-type="bibr">2</xref>]. There is considerable field and experimental evidence that dromedary camels serve as an important reservoir host involved in transmission to humans [<xref rid="B3-viruses-08-00230" ref-type="bibr">3</xref>,<xref rid="B4-viruses-08-00230" ref-type="bibr">4</xref>,<xref rid="B5-viruses-08-00230" ref-type="bibr">5</xref>,<xref rid="B6-viruses-08-00230" ref-type="bibr">6</xref>,<xref rid="B7-viruses-08-00230" ref-type="bibr">7</xref>,<xref rid="B8-viruses-08-00230" ref-type="bibr">8</xref>], but whether other livestock such as goats, sheep, and horses play a role in transmission has only been assessed indirectly. The virus is phylogenetically similar to betacoronaviruses previously detected in bats and there has been speculation that this disease originated through a cross-species transmission from bats to camels or humans [<xref rid="B9-viruses-08-00230" ref-type="bibr">9</xref>,<xref rid="B10-viruses-08-00230" ref-type="bibr">10</xref>,<xref rid="B11-viruses-08-00230" ref-type="bibr">11</xref>].</p><p>Serologic testing of sheep, goats, and cattle from Jordan [<xref rid="B12-viruses-08-00230" ref-type="bibr">12</xref>] and Saudi Arabia [<xref rid="B13-viruses-08-00230" ref-type="bibr">13</xref>] failed to identify animals with neutralizing antibodies to MERS-CoV. Similarly, horses tested in the United Arab Emirates lacked antibodies to MERS-CoV [<xref rid="B14-viruses-08-00230" ref-type="bibr">14</xref>]. Direct contact with dromedaries in Saudi Arabia was found to be independently associated with MERS-CoV illness, while contact with goats, sheep, or horses was not associated with human illness [<xref rid="B15-viruses-08-00230" ref-type="bibr">15</xref>]. In vitro studies in which replication of MERS-CoV in cultured cells was assessed have yielded mixed results with respect to species susceptibility. Cells from goats, but not sheep or cattle, supported replication of MERS-CoV [<xref rid="B16-viruses-08-00230" ref-type="bibr">16</xref>], and primary equine kidney cells supported virus replication, albeit at lower levels than observed with Vero cells [<xref rid="B14-viruses-08-00230" ref-type="bibr">14</xref>]. Transfection of the DPP4 receptor from goats, sheep, and horses into non-permissive mouse or hamster cells allowed replication of MERS-CoV [<xref rid="B17-viruses-08-00230" ref-type="bibr">17</xref>,<xref rid="B18-viruses-08-00230" ref-type="bibr">18</xref>]. Collectively, these in vitro studies suggest the possibility that some livestock are susceptible to infection, but demonstration of infection in live animals is required to better assess their potential as reservoir hosts.</p><p>The objective of this study was to determine if goats, sheep, and horses can be infected with MERS-CoV and assess their potential importance in viral transmission. Goats (<italic>n</italic> = 5) were evaluated for viral shedding, organ burden, and seroconversion and transmission to co-housed goats (<italic>n</italic> = 2). Limited viral shedding was observed without demonstration of viral transmission. Due to the lack of transmission, only viral shedding and serology were evaluated in horses (<italic>n</italic> = 4) and sheep (<italic>n</italic> = 3). These animals did not become productively infected or seroconvert, indicating that such livestock are unlikely to serve as reservoirs for MERS-CoV and are unimportant in viral transmission.</p></sec><sec id="sec2-viruses-08-00230"><title>2. Materials and Methods</title><sec id="sec2dot1-viruses-08-00230"><title>2.1. Ethical Statement</title><p>These studies were approved by the Animal Care and Use Committee of Colorado State University (approval number 13-4384A) and were conducted in an Association for the Assessment and Accreditation of Laboratory Animal Care, International (AAALAC) approved facility.</p></sec><sec id="sec2dot2-viruses-08-00230"><title>2.2. Animal Study</title><p>Two goats, three sheep, and four horses were purchased in Colorado, USA. Both of the goats were bred on site and gave birth to either two (Doe 1) or three kids (Doe 2). All animals were fed a complete pelleted feed supplemented with hay, and were observed at least once daily for nasal discharge, demeanor, food consumption, and clinical status. Sheep, goat kids and horses were each inoculated intranasally with 1.4 × 10<sup>6</sup> to 1.9 × 10<sup>6</sup> plaque-forming units (PFU) of a low passage human isolate of MERS-CoV (strain HCoV-EMC/2012) propagated in Vero E6 cells as described previously [<xref rid="B11-viruses-08-00230" ref-type="bibr">11</xref>]. The goat kids were maintained at all times in a room with their mothers, who served as in-contact controls to test for virus transmission. Rectal temperature and nasal swabs were taken daily for seven days.</p><p>One goat kid from each doe was euthanized 5 days post-inoculation (DPI) and the remaining kids and mother goats were euthanized on day 28 post-inoculation. The horses and sheep were monitored for viral shedding and seroconversion, and were euthanized on day 28 post-inoculation, with the exception of horse 4, which was euthanized on day 17 due to an injury.</p></sec><sec id="sec2dot3-viruses-08-00230"><title>2.3. Viral Titration</title><p>Samples of nasal secretions were collected by inserting and rotating a swab into each nare and were immediately placed in viral transport medium and frozen until plaque assay was performed. Plaques originating from all animals having low titers of virus were confirmed to be MERS-CoV by immunofluorescence using a rabbit polyclonal antiserum against HCoV-EMC-2012 antigen as a primary antibody.</p></sec><sec id="sec2dot4-viruses-08-00230"><title>2.4. Histology and Immunohistochemistry</title><p>Nasal turbinates, trachea, larynx, and lung samples were collected from two kids (goat 1c and 2a) on day 5 post-infection and frozen for virus titration or fixed in 10% neutral-buffered formalin for greater than 7 days prior to being embedded in paraffin. Tissue sections (hematoxylin/eosin and immunohistochemistry) were prepared and evaluated by a veterinary pathologist as previously described [<xref rid="B19-viruses-08-00230" ref-type="bibr">19</xref>]. In order to detect MERS-CoV antigen immunohistochemical analysis was performed with a previously described rabbit polyclonal antiserum against HCoV-EMC-2012 antigen [<xref rid="B19-viruses-08-00230" ref-type="bibr">19</xref>,<xref rid="B20-viruses-08-00230" ref-type="bibr">20</xref>].</p></sec><sec id="sec2dot5-viruses-08-00230"><title>2.5. Serology</title><p>Serum was collected immediately prior to inoculation and weekly thereafter until necropsy. Neutralizing antibodies in sera were assayed using a plaque reduction neutralization test (PRNT) with a 90% neutralization cutoff as described previously [<xref rid="B11-viruses-08-00230" ref-type="bibr">11</xref>].</p></sec></sec><sec id="sec3-viruses-08-00230"><title>3. Results</title><sec id="sec3dot1-viruses-08-00230"><title>3.1. Goats</title><p>Goats were assessed for clinical disease, viral shedding, seroconversion, and viral transmission to their mothers. Fevers were not detected in any of the goats, and no nasal discharge was observed. Low levels of infectious virus were detected in two of the inoculated goat kids from Doe 1 (<xref ref-type="fig" rid="viruses-08-00230-f001">Figure 1</xref>), but not from either of the adult goats that had intimate contact or the kids from Doe 2.</p><p>In order to study acute pathology and determine organ burden, two goats were euthanized on day 5-post infection and nasal turbinates, trachea, and lung were collected. Very small but confirmed quantities of virus were isolated from the turbinates of both goats euthanized 5 days post-infection (DPI) (<xref ref-type="fig" rid="viruses-08-00230-f002">Figure 2</xref>), which may reflect input virus or very low level virus replication. Goat kid 1c was histologically unremarkable, however, the turbinates of goat kid 2a had multifocal areas of loss of goblet cells, epithelial necrosis or squamous metaplasia and attenuation and/or erosion of the epithelium, accompanied by mild to moderate neutrophil and monocyte/macrophage infiltration and occasional minimal hemorrhage. Small amounts of cellular debris, leukocytes and mucus (exudate) were present in the nasal cavity, mainly associated with the aforementioned affected areas. These tissues were negative for viral antigen by immunohistochemistry (IHC) and the histopathologic lesions were very likely the result of trauma from daily swabbing rather than due to virus replication.</p><p>The remaining goats were euthanized on day 28 post-infection and the serological status of the experimentally infected kids and their cohoused dams were assessed. Each of three kid goats held past day 5 seroconverted, however, neutralizing antibodies were not detected in either of the dams (<xref ref-type="table" rid="viruses-08-00230-t001">Table 1</xref>).</p></sec><sec id="sec3dot2-viruses-08-00230"><title>3.2. Sheep</title><p>Three sheep were experimentally infected and evaluated for clinical disease, viral shedding, and seroconversion. No nasal discharge or clinical disease was observed and all three sheep maintained consistent food intake and activity levels. A small quantity of virus was detected in nasal swabs from sheep 1 on days 1, 2, 3, 5, and 6 and from sheep 2 on day 6 (<xref ref-type="fig" rid="viruses-08-00230-f003">Figure 3</xref>).</p><p>Unlike the goats, acute pathology in sheep was not evaluated in this study. The sheep were euthanized on day 28 post-infection, and serum samples from each week were assessed for the presence of MERS-CoV neutralizing antibodies. Sheep 2 developed a low titer of neutralizing antibody on day 14 (10), but neutralizing antibodies were not detected in either of the other two sheep at any time-point tested (<xref ref-type="table" rid="viruses-08-00230-t002">Table 2</xref>).</p></sec><sec id="sec3dot3-viruses-08-00230"><title>3.3. Horses</title><p>Despite no detectable rise in rectal temperature or change in appetite and activity, horses 1 and 3 showed mild intermittent nasal discharge prior to inoculation and throughout the 28 days experiment. Low levels of virus were detected in nasal swab samples from three of the four inoculated horses. Virus was detected on day 3 in horse 2, day 2 in horse 3, and day 1 in horse 4 (<xref ref-type="fig" rid="viruses-08-00230-f004">Figure 4</xref>). Virus was not detected in any of the nasal swab specimens tested from horse 1.</p><p>Serum was collected weekly until day 28 (with the exception of horse 4, which was euthanized early due to an injury unrelated to the experiment), and evaluated for the presence of MERS-CoV neutralizing antibodies. Unlike the inoculated goat kids, none of the infected horses seroconverted (<xref ref-type="table" rid="viruses-08-00230-t003">Table 3</xref>).</p></sec></sec><sec id="sec4-viruses-08-00230"><title>4. Discussion</title><p>The objective of this study was to determine if goats, sheep, or horses could be experimentally infected with MERS-CoV. Very limited amounts of infectious virus were detected in nasal swab specimens of some of the experimentally infected animals, but not in uninfected, co-housed goats. It is possible that the infectious virus detected was residual from the input virus, at least on day 1 post-infection. However, a previous study with alpacas re-challenged 80 days after an initial infection was not able to detect infectious virus upon re-challenge indicating that input challenge virus is not detected one day after infection, although the role of secretory antibodies was not addressed in that study [<xref rid="B19-viruses-08-00230" ref-type="bibr">19</xref>]. Similarly, another study with alpacas re-challenged on day 28 post-infection was unable to detect viral RNA upon re-challenge [<xref rid="B21-viruses-08-00230" ref-type="bibr">21</xref>]. In comparison to experimentally infected dromedaries, significantly less virus was isolated from the livestock in this study. Since the main objective of this study was to determine the role these animals might play in transmission of the virus, we chose to test these samples by plaque assay in order to determine the amount of infectious virus present, rather than by RT-PCR which only reveals the presence of viral RNA regardless of infectivity.</p><p>Previous studies of naturally or experimentally infected camels and experimentally infected alpacas showed variable levels of nasal discharge. Studies in camels demonstrated that infected camels have nasal discharge while infected alpacas did not have any observable discharge [<xref rid="B8-viruses-08-00230" ref-type="bibr">8</xref>,<xref rid="B10-viruses-08-00230" ref-type="bibr">10</xref>,<xref rid="B11-viruses-08-00230" ref-type="bibr">11</xref>,<xref rid="B19-viruses-08-00230" ref-type="bibr">19</xref>]. The goats and sheep in this study did not have any observable discharge; in contrast horses 1 and 3 had discharge throughout the entire study. All animals were examined and healthy prior to the study, but due to the dust associated with the housing of horses we believe this discharge was unrelated to infection and instead an effect of the environment.</p></sec><sec id="sec5-viruses-08-00230"><title>5. Conclusions</title><p>Current evidence suggests that dromedary camels are the primary reservoir of MERS-CoV. However, elucidating the role that other livestock such as goats, sheep, or horses could play in transmission is important for designing field studies and biosecurity strategies, and in assessing individuals at risk for viral transmission. While in vitro studies suggested that these animals could be naturally or experimental infected, the lack of support from field data coupled with the experimental data presented here suggest that these animals are unlikely to be infected and are not important in viral transmission of MERS-CoV.</p></sec></body><back><ack><title>Acknowledgments</title><p>We thank Erasmus Medical Center (Rotterdam, The Netherlands) for providing virus isolate hCoV-EMC/2012 and Vincent Munster and the Rocky Mountain Laboratories for providing the rabbit antiserum against MERS-CoV. This study was supported by the Animal Models Core at Colorado State University. Danielle R. Adney was supported by the Infectious Disease Translational Research Training Program at Colorado State University. Stephanie M. Porter was supported by USDA-NIFA Animal Health & Disease Research Program Funding 2016-36100-06008.</p></ack><notes><title>Author Contributions</title><p>Danielle R. Adney and Richard A. 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Tissues from goat kids 1c and 2a were collected at necropsy 5 days post-infection and viral load was determined by plaque assay of tissue homogenates. The limit of detection for this assay is 1.5 log<sub>10</sub> PFU/g, indicated by the dashed line.</p></caption><graphic xlink:href="viruses-08-00230-g002"></graphic></fig><fig id="viruses-08-00230-f003" position="float"><label>Figure 3</label><caption><p>MERS-CoV Shedding in Sheep. Virus isolation was performed by plaque assay from nasal swab specimens obtained from sheep experimentally infected with MERS-CoV. The limit of detection for this assay was 1.5 log<sub>10</sub> PFU/mL, indicated by the dashed line.</p></caption><graphic xlink:href="viruses-08-00230-g003"></graphic></fig><fig id="viruses-08-00230-f004" position="float"><label>Figure 4</label><caption><p>MERS-CoV Shedding in Horses. Virus isolation was performed by plaque assay from nasal swab specimens obtained from horses experimentally infected with MERS-CoV. The limit of detection for this assay is 1.5 log<sub>10</sub> PFU/mL, indicated by the dashed line.</p></caption><graphic xlink:href="viruses-08-00230-g004"></graphic></fig><table-wrap id="viruses-08-00230-t001" position="float"><object-id pub-id-type="pii">viruses-08-00230-t001_Table 1</object-id><label>Table 1</label><caption><p>Neutralizing antibody titers in goats experimentally infected or exposed by contact to MERS-CoV. Mother goats are indicated as 1 or 2, and their corresponded kids are indicated as 1a, 1b, 1c (Doe 1), 2a, or 2b (Doe 2). Titers represent dilutions of serum which neutralized ≥90% of input virus. ND = not done.</p></caption><table frame="hsides" rules="groups"><thead><tr><th align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1"></th><th align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">1</th><th align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">1a</th><th align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">1b</th><th align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">1c</th><th align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">2</th><th align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">2a</th><th align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">2b</th></tr></thead><tbody><tr><td align="center" valign="middle" rowspan="1" colspan="1"><bold>D0</bold></td><td align="center" valign="middle" rowspan="1" colspan="1"><10</td><td align="center" valign="middle" rowspan="1" colspan="1"><10</td><td align="center" valign="middle" rowspan="1" colspan="1"><10</td><td align="center" valign="middle" rowspan="1" colspan="1"><10</td><td align="center" valign="middle" rowspan="1" colspan="1"><10</td><td align="center" valign="middle" rowspan="1" colspan="1"><10</td><td align="center" valign="middle" rowspan="1" colspan="1"><10</td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1"><bold>D7</bold></td><td align="center" valign="middle" rowspan="1" colspan="1"><10</td><td align="center" valign="middle" rowspan="1" colspan="1">40</td><td align="center" valign="middle" rowspan="1" colspan="1">80</td><td align="center" valign="middle" rowspan="1" colspan="1">ND</td><td align="center" valign="middle" rowspan="1" colspan="1"><10</td><td align="center" valign="middle" rowspan="1" colspan="1">ND</td><td align="center" valign="middle" rowspan="1" colspan="1">20</td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1"><bold>D14</bold></td><td align="center" valign="middle" rowspan="1" colspan="1"><10</td><td align="center" valign="middle" rowspan="1" colspan="1">20</td><td align="center" valign="middle" rowspan="1" colspan="1">40</td><td align="center" valign="middle" rowspan="1" colspan="1">ND</td><td align="center" valign="middle" rowspan="1" colspan="1"><10</td><td align="center" valign="middle" rowspan="1" colspan="1">ND</td><td align="center" valign="middle" rowspan="1" colspan="1">40</td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1"><bold>D21</bold></td><td align="center" valign="middle" rowspan="1" colspan="1"><10</td><td align="center" valign="middle" rowspan="1" colspan="1">20</td><td align="center" valign="middle" rowspan="1" colspan="1">20</td><td align="center" valign="middle" rowspan="1" colspan="1">ND</td><td align="center" valign="middle" rowspan="1" colspan="1"><10</td><td align="center" valign="middle" rowspan="1" colspan="1">ND</td><td align="center" valign="middle" rowspan="1" colspan="1">10</td></tr><tr><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1"><bold>D28</bold></td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1"><10</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">20</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">20</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">ND</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1"><10</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">ND</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1"><10</td></tr></tbody></table></table-wrap><table-wrap id="viruses-08-00230-t002" position="float"><object-id pub-id-type="pii">viruses-08-00230-t002_Table 2</object-id><label>Table 2</label><caption><p>Neutralizing antibody titers in sheep experimentally infected with MERS-CoV. Titers were determined by plaque reduction neutralization test (PRNT) using a 90% cutoff.</p></caption><table frame="hsides" rules="groups"><thead><tr><th align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1"></th><th align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Sheep 1</th><th align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Sheep 2</th><th align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Sheep 3</th></tr></thead><tbody><tr><td align="center" valign="middle" rowspan="1" colspan="1"><bold>D0</bold></td><td align="center" valign="middle" rowspan="1" colspan="1"><10</td><td align="center" valign="middle" rowspan="1" colspan="1"><10</td><td align="center" valign="middle" rowspan="1" colspan="1"><10</td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1"><bold>D7</bold></td><td align="center" valign="middle" rowspan="1" colspan="1"><10</td><td align="center" valign="middle" rowspan="1" colspan="1"><10</td><td align="center" valign="middle" rowspan="1" colspan="1"><10</td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1"><bold>D14</bold></td><td align="center" valign="middle" rowspan="1" colspan="1"><10</td><td align="center" valign="middle" rowspan="1" colspan="1">10</td><td align="center" valign="middle" rowspan="1" colspan="1"><10</td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1"><bold>D21</bold></td><td align="center" valign="middle" rowspan="1" colspan="1"><10</td><td align="center" valign="middle" rowspan="1" colspan="1"><10</td><td align="center" valign="middle" rowspan="1" colspan="1"><10</td></tr><tr><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1"><bold>D28</bold></td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1"><10</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1"><10</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1"><10</td></tr></tbody></table></table-wrap><table-wrap id="viruses-08-00230-t003" position="float"><object-id pub-id-type="pii">viruses-08-00230-t003_Table 3</object-id><label>Table 3</label><caption><p>Neutralizing antibody titers in horses experimentally infected with MERS-CoV. Titers were determined by PRNT using a 90% cutoff.</p></caption><table frame="hsides" rules="groups"><thead><tr><th align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1"></th><th align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Horse 1</th><th align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Horse 2</th><th align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Horse 3</th><th align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Horse 4</th></tr></thead><tbody><tr><td align="center" valign="middle" rowspan="1" colspan="1"><bold>D0</bold></td><td align="center" valign="middle" rowspan="1" colspan="1"><10</td><td align="center" valign="middle" rowspan="1" colspan="1"><10</td><td align="center" valign="middle" rowspan="1" colspan="1"><10</td><td align="center" valign="middle" rowspan="1" colspan="1"><10</td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1"><bold>D7</bold></td><td align="center" valign="middle" rowspan="1" colspan="1"><10</td><td align="center" valign="middle" rowspan="1" colspan="1"><10</td><td align="center" valign="middle" rowspan="1" colspan="1"><10</td><td align="center" valign="middle" rowspan="1" colspan="1"><10</td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1"><bold>D14</bold></td><td align="center" valign="middle" rowspan="1" colspan="1"><10</td><td align="center" valign="middle" rowspan="1" colspan="1"><10</td><td align="center" valign="middle" rowspan="1" colspan="1"><10</td><td align="center" valign="middle" rowspan="1" colspan="1"><10</td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1"><bold>D21</bold></td><td align="center" valign="middle" rowspan="1" colspan="1"><10</td><td align="center" valign="middle" rowspan="1" colspan="1"><10</td><td align="center" valign="middle" rowspan="1" colspan="1"><10</td><td align="center" valign="middle" rowspan="1" colspan="1">NA <sup>1</sup></td></tr><tr><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1"><bold>D28</bold></td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1"><10</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1"><10</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1"><10</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">NA <sup>1</sup></td></tr></tbody></table><table-wrap-foot><fn><p><sup>1</sup> NA: Sample not available.</p></fn></table-wrap-foot></table-wrap></floats-group></pmc></record>Pour manipuler ce document sous Unix (Dilib)
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