Global research trends of Middle East respiratory syndrome coronavirus: a bibliometric analysis
Identifieur interne : 000311 ( Pmc/Corpus ); précédent : 000310; suivant : 000312Global research trends of Middle East respiratory syndrome coronavirus: a bibliometric analysis
Auteurs : Sa D H. ZyoudSource :
- BMC Infectious Diseases [ 1471-2334 ] ; 2016.
Abstract
Middle East respiratory syndrome coronavirus (MERS-CoV) is a virus that causes severe viral pneumonia in humans, known to have a high mortality rate and a similarity in clinical symptoms with severe acute respiratory syndrome coronavirus. It was first isolated in Kingdom of Saudi Arabia (KSA) in 2012 and after that, MERS-CoV exhibited outbreaks in several regions of the world. This study aimed to assess the characteristics of publications involving MERS-CoV at global level by using a bibliometric analysis.
A total of 883 MERS-CoV research publications were published across the world. The MERS-CoV-associated publications were originated from 92 countries/territories, indicating the international spread of MERS-CoV research. The USA was the largest contributor, with 319 articles published over 4 years, followed by KSA (113 articles). The total number of citations for these publications has already achieved 8,015, with an average of 9.01 citations per each publication. The
There is a rapid increase in research activities related to MERS-CoV from 2012 to 2015. This study demonstrates that the MERS-CoV related literature has grown to be more extensive and global over the past 4 years. The bulk of publications in the field of MERS-CoV research are published by high-income countries such as the USA. Furthermore, the USA, the UK and KSA may have higher quality of articles according to the value of
Url:
DOI: 10.1186/s12879-016-1600-5
PubMed: 27267256
PubMed Central: 4897912
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PMC:4897912Le document en format XML
<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Global research trends of Middle East respiratory syndrome coronavirus: a bibliometric analysis</title><author><name sortKey="Zyoud, Sa D H" sort="Zyoud, Sa D H" uniqKey="Zyoud S" first="Sa D H." last="Zyoud">Sa D H. Zyoud</name><affiliation><nlm:aff id="Aff1"><institution-wrap><institution-id institution-id-type="GRID">grid.11942.3f</institution-id><institution-id institution-id-type="ISNI">0000000406315695</institution-id><institution>Division of Clinical and Community Pharmacy, Department of Pharmacy, Faculty of Medicine and Health Sciences,</institution><institution>An-Najah National University,</institution></institution-wrap>Nablus, 44839 Palestine</nlm:aff></affiliation><affiliation><nlm:aff id="Aff2"><institution-wrap><institution-id institution-id-type="GRID">grid.11942.3f</institution-id><institution-id institution-id-type="ISNI">0000000406315695</institution-id><institution>Poison Control and Drug Information Center (PCDIC), Faculty of Medicine and Health Sciences,</institution><institution>An-Najah National University,</institution></institution-wrap>Nablus, 44839 Palestine</nlm:aff></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">27267256</idno><idno type="pmc">4897912</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4897912</idno><idno type="RBID">PMC:4897912</idno><idno type="doi">10.1186/s12879-016-1600-5</idno><date when="2016">2016</date><idno type="wicri:Area/Pmc/Corpus">000311</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">000311</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Global research trends of Middle East respiratory syndrome coronavirus: a bibliometric analysis</title><author><name sortKey="Zyoud, Sa D H" sort="Zyoud, Sa D H" uniqKey="Zyoud S" first="Sa D H." last="Zyoud">Sa D H. Zyoud</name><affiliation><nlm:aff id="Aff1"><institution-wrap><institution-id institution-id-type="GRID">grid.11942.3f</institution-id><institution-id institution-id-type="ISNI">0000000406315695</institution-id><institution>Division of Clinical and Community Pharmacy, Department of Pharmacy, Faculty of Medicine and Health Sciences,</institution><institution>An-Najah National University,</institution></institution-wrap>Nablus, 44839 Palestine</nlm:aff></affiliation><affiliation><nlm:aff id="Aff2"><institution-wrap><institution-id institution-id-type="GRID">grid.11942.3f</institution-id><institution-id institution-id-type="ISNI">0000000406315695</institution-id><institution>Poison Control and Drug Information Center (PCDIC), Faculty of Medicine and Health Sciences,</institution><institution>An-Najah National University,</institution></institution-wrap>Nablus, 44839 Palestine</nlm:aff></affiliation></author></analytic><series><title level="j">BMC Infectious Diseases</title><idno type="eISSN">1471-2334</idno><imprint><date when="2016">2016</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><sec><title>Background</title><p id="Par1">Middle East respiratory syndrome coronavirus (MERS-CoV) is a virus that causes severe viral pneumonia in humans, known to have a high mortality rate and a similarity in clinical symptoms with severe acute respiratory syndrome coronavirus. It was first isolated in Kingdom of Saudi Arabia (KSA) in 2012 and after that, MERS-CoV exhibited outbreaks in several regions of the world. This study aimed to assess the characteristics of publications involving MERS-CoV at global level by using a bibliometric analysis.</p></sec><sec><title>Methods</title><p id="Par2"><italic>Scopus</italic> database was searched on March 4, 2016 for MERS-CoV publications published between 2012 and 2015. It was performed on the same day in order to avoid the possible bias came from update on the database because the metrics are changing over time. All publication types were considered; however publications as errata were excluded. Analysis parameters include year of publication, publication type, patterns of international collaboration, research institutions, journals, impact factor, <italic>h</italic>-index, language, and times cited.</p></sec><sec><title>Results</title><p id="Par3">A total of 883 MERS-CoV research publications were published across the world. The MERS-CoV-associated publications were originated from 92 countries/territories, indicating the international spread of MERS-CoV research. The USA was the largest contributor, with 319 articles published over 4 years, followed by KSA (113 articles). The total number of citations for these publications has already achieved 8,015, with an average of 9.01 citations per each publication. The <italic>h</italic>-index for MERS-CoV-associated publications was 48. The USA also have the highest <italic>h</italic>-index (32), followed by KSA (26) and UK (22). Netherland produced the greatest proportion of publications with international research collaboration (72.7 %) followed by the UK (71 %) and Germany (69.1 %) out of the total number of publications for each country.</p></sec><sec><title>Conclusions</title><p id="Par4">There is a rapid increase in research activities related to MERS-CoV from 2012 to 2015. This study demonstrates that the MERS-CoV related literature has grown to be more extensive and global over the past 4 years. The bulk of publications in the field of MERS-CoV research are published by high-income countries such as the USA. 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<front><journal-meta><journal-id journal-id-type="nlm-ta">BMC Infect Dis</journal-id><journal-id journal-id-type="iso-abbrev">BMC Infect. Dis</journal-id><journal-title-group><journal-title>BMC Infectious Diseases</journal-title></journal-title-group><issn pub-type="epub">1471-2334</issn><publisher><publisher-name>BioMed Central</publisher-name><publisher-loc>London</publisher-loc></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">27267256</article-id><article-id pub-id-type="pmc">4897912</article-id><article-id pub-id-type="publisher-id">1600</article-id><article-id pub-id-type="doi">10.1186/s12879-016-1600-5</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title>Global research trends of Middle East respiratory syndrome coronavirus: a bibliometric analysis</article-title></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name><surname>Zyoud</surname><given-names>Sa’ed H.</given-names></name><address><email>saedzyoud@yahoo.com</email><email>saedzyoud@najah.edu</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="GRID">grid.11942.3f</institution-id><institution-id institution-id-type="ISNI">0000000406315695</institution-id><institution>Division of Clinical and Community Pharmacy, Department of Pharmacy, Faculty of Medicine and Health Sciences,</institution><institution>An-Najah National University,</institution></institution-wrap>Nablus, 44839 Palestine</aff><aff id="Aff2"><label>2</label><institution-wrap><institution-id institution-id-type="GRID">grid.11942.3f</institution-id><institution-id institution-id-type="ISNI">0000000406315695</institution-id><institution>Poison Control and Drug Information Center (PCDIC), Faculty of Medicine and Health Sciences,</institution><institution>An-Najah National University,</institution></institution-wrap>Nablus, 44839 Palestine</aff></contrib-group><pub-date pub-type="epub"><day>7</day><month>6</month><year>2016</year></pub-date><pub-date pub-type="pmc-release"><day>7</day><month>6</month><year>2016</year></pub-date><pub-date pub-type="collection"><year>2016</year></pub-date><volume>16</volume><elocation-id>255</elocation-id><history><date date-type="received"><day>19</day><month>3</month><year>2016</year></date><date date-type="accepted"><day>27</day><month>5</month><year>2016</year></date></history><permissions><copyright-statement>© The Author(s). 2016</copyright-statement><license license-type="OpenAccess"><license-p><bold>Open Access</bold>This article is distributed under the terms of the Creative Commons Attribution 4.0 International 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>), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (<ext-link ext-link-type="uri" xlink:href="http://creativecommons.org/publicdomain/zero/1.0/">http://creativecommons.org/publicdomain/zero/1.0/</ext-link>) applies to the data made available in this article, unless otherwise stated.</license-p></license></permissions><abstract id="Abs1"><sec><title>Background</title><p id="Par1">Middle East respiratory syndrome coronavirus (MERS-CoV) is a virus that causes severe viral pneumonia in humans, known to have a high mortality rate and a similarity in clinical symptoms with severe acute respiratory syndrome coronavirus. It was first isolated in Kingdom of Saudi Arabia (KSA) in 2012 and after that, MERS-CoV exhibited outbreaks in several regions of the world. This study aimed to assess the characteristics of publications involving MERS-CoV at global level by using a bibliometric analysis.</p></sec><sec><title>Methods</title><p id="Par2"><italic>Scopus</italic> database was searched on March 4, 2016 for MERS-CoV publications published between 2012 and 2015. It was performed on the same day in order to avoid the possible bias came from update on the database because the metrics are changing over time. All publication types were considered; however publications as errata were excluded. Analysis parameters include year of publication, publication type, patterns of international collaboration, research institutions, journals, impact factor, <italic>h</italic>-index, language, and times cited.</p></sec><sec><title>Results</title><p id="Par3">A total of 883 MERS-CoV research publications were published across the world. The MERS-CoV-associated publications were originated from 92 countries/territories, indicating the international spread of MERS-CoV research. The USA was the largest contributor, with 319 articles published over 4 years, followed by KSA (113 articles). The total number of citations for these publications has already achieved 8,015, with an average of 9.01 citations per each publication. The <italic>h</italic>-index for MERS-CoV-associated publications was 48. The USA also have the highest <italic>h</italic>-index (32), followed by KSA (26) and UK (22). Netherland produced the greatest proportion of publications with international research collaboration (72.7 %) followed by the UK (71 %) and Germany (69.1 %) out of the total number of publications for each country.</p></sec><sec><title>Conclusions</title><p id="Par4">There is a rapid increase in research activities related to MERS-CoV from 2012 to 2015. This study demonstrates that the MERS-CoV related literature has grown to be more extensive and global over the past 4 years. The bulk of publications in the field of MERS-CoV research are published by high-income countries such as the USA. Furthermore, the USA, the UK and KSA may have higher quality of articles according to the value of <italic>h-</italic>index.</p></sec></abstract><kwd-group xml:lang="en"><title>Keywords</title><kwd>Bibliometric</kwd><kwd><italic>Scopus</italic></kwd><kwd>Coronavirus</kwd><kwd>Middle East respiratory syndrome coronavirus</kwd><kwd>MERS-CoV</kwd></kwd-group><custom-meta-group><custom-meta><meta-name>issue-copyright-statement</meta-name><meta-value>© The Author(s) 2016</meta-value></custom-meta></custom-meta-group></article-meta></front><body><sec id="Sec1" sec-type="introduction"><title>Background</title><p id="Par5">Middle East respiratory syndrome coronavirus (MERS-CoV) is a virus that causes severe viral pneumonia in humans, known as having a high mortality rate and having a similarity in clinical symptoms with severe acute respiratory syndrome coronavirus [<xref ref-type="bibr" rid="CR1">1</xref>–<xref ref-type="bibr" rid="CR3">3</xref>]. It was first happened in Jordan in April, 2012 [<xref ref-type="bibr" rid="CR4">4</xref>], and then the virus was isolated from a patients in Kingdom of Saudi Arabia (KSA) [<xref ref-type="bibr" rid="CR5">5</xref>–<xref ref-type="bibr" rid="CR7">7</xref>]. After that, MERS-CoV exhibited outbreaks in several regions of the world [<xref ref-type="bibr" rid="CR8">8</xref>–<xref ref-type="bibr" rid="CR12">12</xref>]. Although MERS-CoV is thought to be a zoonosis, probably camels act as a direct source of human MERS-CoV infection [<xref ref-type="bibr" rid="CR13">13</xref>, <xref ref-type="bibr" rid="CR14">14</xref>], most cases are now due to human-to-human transmission [<xref ref-type="bibr" rid="CR9">9</xref>, <xref ref-type="bibr" rid="CR11">11</xref>, <xref ref-type="bibr" rid="CR12">12</xref>, <xref ref-type="bibr" rid="CR15">15</xref>–<xref ref-type="bibr" rid="CR17">17</xref>]. The virus was firstly nominated Human Coronavirus Erasmus Medical Center/2012 (HCoV-EMC/2012) [<xref ref-type="bibr" rid="CR5">5</xref>], but after global consensus it was renamed MERS-CoV [<xref ref-type="bibr" rid="CR18">18</xref>].</p><p id="Par6">In order to evaluate its current impact on global scientific research production, a bibliometric analysis was performed using available information indexed at most common journals-indexing databases, such as <italic>Scopus</italic>. Bibliometric analysis examines the progress of any topic and offers a comprehensive assessment of scientific research trends. In recent years, bibliometric analysis has been extensively performed to assess scientific activities in many fields, including infectious diseases such as Mayaro virus fever [<xref ref-type="bibr" rid="CR19">19</xref>], Zika virus [<xref ref-type="bibr" rid="CR20">20</xref>], Ebola virus disease [<xref ref-type="bibr" rid="CR21">21</xref>, <xref ref-type="bibr" rid="CR22">22</xref>], yellow fever disease [<xref ref-type="bibr" rid="CR23">23</xref>], dengue [<xref ref-type="bibr" rid="CR24">24</xref>], Malaria [<xref ref-type="bibr" rid="CR25">25</xref>], leishmaniasis [<xref ref-type="bibr" rid="CR26">26</xref>, <xref ref-type="bibr" rid="CR27">27</xref>], influenza [<xref ref-type="bibr" rid="CR28">28</xref>], and John Cunningham virus [<xref ref-type="bibr" rid="CR29">29</xref>]. To the best of knowledge of the author, there has been no bibliometric study about MERS-CoV research in the English literature. This study aimed to assess the characteristics and quality of articles involving MERS-CoV at global level. The study approach is employed to assess MERS-CoV related research characteristics such as countries, journals, research institutions, and citation habits.</p></sec><sec id="Sec2" sec-type="materials|methods"><title>Methods</title><p id="Par7">Publications used in this analysis were extracted from the <italic>Scopus</italic> database developed by Elsevier in the Netherlands. Scopus is a relatively large database compared to PubMed and Web of Science [<xref ref-type="bibr" rid="CR30">30</xref>] which contains information for publications published in more than 21,500 titles of which 20,000 are peer-reviewed journals from more than 5,000 international publishers [<xref ref-type="bibr" rid="CR31">31</xref>]. Selected publications included “Middle East respiratory syndrome coronavirus” or “MERS-CoV” or “Human Coronavirus Erasmus Medical Center/2012” or “HCoV-EMC/2012” as a part of its title, abstract, or keyword from 2012 till the date of December 31, 2015 All of these terms are used in one query. Publications as errata or publications which their scope was not related to MERS-CoV, and publications from 2016 were excluded from the study. Research indicators for the assessment of MERS-CoV research output were determined according to the methods used previously in similar bibliometric studies [<xref ref-type="bibr" rid="CR32">32</xref>–<xref ref-type="bibr" rid="CR37">37</xref>]. Analysis parameters include date (year) of publication, publication type, patterns of international collaboration, research institutions, journals, impact factor (IF), <italic>h</italic>-index, language, and times cited. International collaborations were considered when the paper affiliation contained different countries.</p><p id="Par8">To measure the impact and/or productivity of the research published in the field of MERS-CoV, <italic>h</italic>-index and IF were used as bibliometric indicators for this evaluation. The <italic>h</italic>-index was introduced in literature in 2005 by Hirsch for the assessment of individual academic attainment [<xref ref-type="bibr" rid="CR38">38</xref>]. The <italic>h</italic>-index can more truthfully represent the author’s or country’s achievement; a higher <italic>h-</italic>index shows that the publication׳s larger influential power. The IF of the journals as reported in Journal Citation Reports® (JCR) 2014 was used [<xref ref-type="bibr" rid="CR39">39</xref>]. Only the ten top-ranked journals were considered and they were shown in descending order from 1st to 10th using the standard competition ranking (SCR), with the highest absolute number of publications ranked 1, as obtained on the day of data collection (March 4, 2016). Data collection and analysis were performed on the same day in order to avoid the possible bias came from update on the database because the metrics are changing over time. Parameters with the same number of publications were given the same rank number.</p><sec id="Sec3"><title>Statistical analysis</title><p id="Par9">The analysis was performed using descriptive statistics in Microsoft Excel 2007, and SPSS statistical software (SPSS for Windows, version 15, SPSS Inc Chicago, IL, USA). The analysis involved the calculation of relative frequencies, percentages, sum, and average.</p></sec></sec><sec id="Sec4" sec-type="results"><title>Results</title><p id="Par10">A total of 883 MERS-CoV-associated publications were retrieved in the study search. Nine publications were published in 2012, 155 in 2013, 318 in 2014, and 401 in 2015. Around sixty percent of total share was published as original articles, 13.3 % as reviews, 9.5 % as editorial materials, 7.5 % as letters, and the remaining being note, erratum, and conference Paper. Among these articles, 829 (93.9 %) were written in English, 18 (2.04 %) were in Korean, 12 (1.4 %) were in Chinese, 10 (1.1 %) were in German, and the remainder of articles were in a variety of other languages such as French, Czech, Dutch, Greek, Polish, and Hungarian.</p><p id="Par11">The MERS-CoV-associated publications were originated from 92 countries/territories, indicating the international spread of MERS-CoV research. Table <xref rid="Tab1" ref-type="table">1</xref> shows the 10 countries with the highest number of publications included in the <italic>h</italic>-indices. Out of 883 publications, the USA was the largest contributor, with 319 (36.1 %) articles published over 4 years; this was followed by KSA (113, 12.8 %), China (103, 11.7 %), and the UK (93, 10.5 %). The total number of citations for these publications has already achieved 8,015, with an average of 9.01 citations per each publication. The <italic>h</italic>-index for MERS-CoV-associated publications was 48. The USA also have the highest <italic>h</italic>-index (32), followed by KSA (26) and the UK (22). Netherland produced the greatest proportion of publications with international research collaboration (72.7 %) followed by the UK (71 %) and Germany (69.1 %) out of the total number of publications for each country (Table <xref rid="Tab1" ref-type="table">1</xref>).<table-wrap id="Tab1"><label>Table 1</label><caption><p>Top ten countries/territories with scientific production on MERS-CoV research at <italic>Scopus</italic> (up to December 31, 2015)</p></caption><table frame="hsides" rules="groups"><thead><tr><th>SCR</th><th>Countries/territories</th><th>Total number of publications for the whole period (%)</th><th>h-index</th><th>Number (%) of publications with international collaboration</th></tr></thead><tbody><tr><td>1st</td><td>United States</td><td>319 (36.1)</td><td>32</td><td>168 (52.7)</td></tr><tr><td>2nd</td><td>Saudi Arabia</td><td>113 (12.8)</td><td>26</td><td>76 (67.3)</td></tr><tr><td>3rd</td><td>China</td><td>103 (11.7)</td><td>19</td><td>63 (61.2)</td></tr><tr><td>4th</td><td>United Kingdom</td><td>93 (10.5)</td><td>22</td><td>66 (71.0)</td></tr><tr><td>5th</td><td>Hong Kong</td><td>71 (8.0)</td><td>18</td><td>47 (66.2)</td></tr><tr><td>6th</td><td>Germany</td><td>68 (7.7)</td><td>21</td><td>47 (69.1)</td></tr><tr><td>7th</td><td>Netherlands</td><td>55 (6.2)</td><td>21</td><td>40 (72.7)</td></tr><tr><td>8th</td><td>South Korea</td><td>39 (4.4)</td><td>4</td><td>4 (10.3)</td></tr><tr><td>9th</td><td>France</td><td>37 (4.2)</td><td>10</td><td>17 (45.9)</td></tr><tr><td>10th</td><td>Australia</td><td>27 (3.1)</td><td>6</td><td>13 (48.1)</td></tr></tbody></table><table-wrap-foot><p><italic>SCR</italic> standard competition ranking</p></table-wrap-foot></table-wrap></p><p id="Par12">The MERS-CoV-associated publications were published in 384 different journals, but most frequently in these journals: <italic>Journal of Virology</italic> (46), <italic>Emerging Infectious Diseases</italic> (43), <italic>Eurosurveillance</italic> (36), and <italic>The Lancet Infectious Diseases</italic> (35); (Table <xref rid="Tab2" ref-type="table">2</xref>). The IF for journals including top 10 cited MERS-CoV publications ranged from 1.859 to 45.217.<table-wrap id="Tab2"><label>Table 2</label><caption><p>The 10 most published journals</p></caption><table frame="hsides" rules="groups"><thead><tr><th>SCR<sup>a</sup></th><th>Journal</th><th>Frequency (%)</th><th>IF <sup>b</sup></th></tr></thead><tbody><tr><td>1st</td><td><italic>Journal of Virology</italic></td><td>46 (5.2)</td><td>4.439</td></tr><tr><td>2nd</td><td><italic>Emerging Infectious Diseases</italic></td><td>43 (4.9)</td><td>6.751</td></tr><tr><td>3rd</td><td><italic>Eurosurveillance</italic></td><td>36 (4.1)</td><td>5.722</td></tr><tr><td>4th</td><td><italic>The Lancet Infectious Diseases</italic></td><td>35 (4.0)</td><td>22.433</td></tr><tr><td>5th</td><td><italic>MBio</italic></td><td>34 (3.9)</td><td>6.786</td></tr><tr><td>6th</td><td><italic>The lancet</italic></td><td>24 (2.7)</td><td>45.217</td></tr><tr><td>7th</td><td><italic>International Journal of Infectious Diseases</italic></td><td>20 (2.3)</td><td>1.859</td></tr><tr><td>8th</td><td><italic>Virus Research</italic></td><td>17 (1.9)</td><td>2.324</td></tr><tr><td>9th</td><td><italic>Journal of the Korean Medical Association</italic></td><td>15 (1.7)</td><td>NA</td></tr><tr><td>9th</td><td><italic>Journal of Infectious Diseases</italic></td><td>15 (1.7)</td><td>5.997</td></tr></tbody></table><table-wrap-foot><p><italic>SCR</italic> standard competition ranking, <italic>NA</italic> not available, <italic>IF</italic> impact factor</p><p><sup>a</sup> Equal journals have the same ranking number, and then a gap is left in the ranking numbers</p><p><sup>b</sup> The impact factor was reported according to the journal citation reports (JCR) 2014</p></table-wrap-foot></table-wrap></p><p id="Par13">Table <xref rid="Tab3" ref-type="table">3</xref> shows the top-cited publications published in the field of MERS-CoV [<xref ref-type="bibr" rid="CR2">2</xref>, <xref ref-type="bibr" rid="CR5">5</xref>, <xref ref-type="bibr" rid="CR6">6</xref>, <xref ref-type="bibr" rid="CR18">18</xref>, <xref ref-type="bibr" rid="CR40">40</xref>–<xref ref-type="bibr" rid="CR46">46</xref>]. The 10 most frequently cited articles have been cited more than 137 times from their initial publication year until March 4, 2016. The most frequently cited article (645 citations) was published by Zaki et al. in 2012 in the <italic>New England Journal of Medicine</italic> [<xref ref-type="bibr" rid="CR5">5</xref>], followed by Assiri et al. [<xref ref-type="bibr" rid="CR40">40</xref>] which was published in the <italic>New England Journal of Medicine</italic> in 2013. Majority of the top cited papers were published in journals with high IF (IF > 10).<table-wrap id="Tab3"><label>Table 3</label><caption><p>The top 10 cited publications</p></caption><table frame="hsides" rules="groups"><thead><tr><th>SCR<sup>a</sup></th><th>Authors</th><th>Title</th><th>Year of publication</th><th>Source title</th><th>Cited by</th><th>IF<sup>b</sup></th></tr></thead><tbody><tr><td>1st</td><td>Zaki et al [<xref ref-type="bibr" rid="CR5">5</xref>]</td><td>Isolation of a novel coronavirus from a man with pneumonia in Saudi Arabia</td><td>2012</td><td><italic>New England Journal of Medicine</italic></td><td>645</td><td char="." align="char">55.873</td></tr><tr><td>2nd</td><td>Assiri et al [<xref ref-type="bibr" rid="CR40">40</xref>]</td><td>Hospital outbreak of middle east respiratory syndrome coronavirus</td><td>2013</td><td><italic>New England Journal of Medicine</italic></td><td>256</td><td char="." align="char">55.873</td></tr><tr><td>3rd</td><td>van Boheemen et al [<xref ref-type="bibr" rid="CR45">45</xref>]</td><td>Genomic characterization of a newly discovered coronavirus associated with acute respiratory distress syndrome in humans</td><td>2012</td><td><italic>MBio</italic></td><td>217</td><td char="." align="char">6.786</td></tr><tr><td>4th</td><td>Raj et al [<xref ref-type="bibr" rid="CR46">46</xref>]</td><td>Dipeptidyl peptidase 4 is a functional receptor for the emerging human coronavirus-EMC</td><td>2012</td><td><italic>Nature</italic></td><td>216</td><td char="." align="char">41.456</td></tr><tr><td>5th</td><td>Reusken et al [<xref ref-type="bibr" rid="CR41">41</xref>]</td><td>Middle East respiratory syndrome coronavirus neutralising serum antibodies in dromedary camels: A comparative serological study</td><td>2013</td><td><italic>The Lancet Infectious Diseases</italic></td><td>190</td><td char="." align="char">22.433</td></tr><tr><td>6th</td><td>de Groot et al [<xref ref-type="bibr" rid="CR18">18</xref>]</td><td>Middle east respiratory syndrome coronavirus (MERS-CoV): Announcement of the coronavirus study group</td><td>2013</td><td><italic>Journal of Virology</italic></td><td>172</td><td char="." align="char">4.439</td></tr><tr><td>7th</td><td>Assiri et al [<xref ref-type="bibr" rid="CR2">2</xref>]</td><td>Epidemiological, demographic, and clinical characteristics of 47 cases of Middle East respiratory syndrome coronavirus disease from Saudi Arabia: A descriptive study</td><td>2013</td><td><italic>The Lancet Infectious Diseases</italic></td><td>150</td><td char="." align="char">22.433</td></tr><tr><td>8th</td><td>Bermingham et al [<xref ref-type="bibr" rid="CR6">6</xref>]</td><td>Severe respiratory illness caused by a novel coronavirus, in a patient transferred to the United Kingdom from the Middle East, September 2012</td><td>2012</td><td><italic>Eurosurveillance</italic></td><td>148</td><td char="." align="char">5.722</td></tr><tr><td>9th</td><td>Guery et al [<xref ref-type="bibr" rid="CR42">42</xref>]</td><td>Clinical features and viral diagnosis of two cases of infection with Middle East Respiratory Syndrome coronavirus: A report of nosocomial transmission</td><td>2013</td><td><italic>The Lancet</italic></td><td>139</td><td char="." align="char">45.217</td></tr><tr><td>10th</td><td>Memish et al [<xref ref-type="bibr" rid="CR43">43</xref>]</td><td>Middle East respiratory syndrome coronavirus in Bats, Saudi Arabia</td><td>2013</td><td><italic>Emerging Infectious Diseases</italic></td><td>137</td><td char="." align="char">6.751</td></tr><tr><td>10th</td><td>Memish et al [<xref ref-type="bibr" rid="CR44">44</xref>]</td><td>Family cluster of middle east respiratory syndrome coronavirus infections</td><td>2013</td><td><italic>New England Journal of Medicine</italic></td><td>137</td><td char="." align="char">55.873</td></tr></tbody></table><table-wrap-foot><p>SCR, Standard competition ranking; NA, Not available; IF, Impact factor</p><p><sup>a</sup> Equal articles have the same ranking number, and then a gap is left in the ranking numbers</p><p><sup>b</sup> The impact factor was reported according to the journal citation reports (JCR) 2014</p></table-wrap-foot></table-wrap></p><p id="Par14">The contribution of the 10 most productive institutes in MERS-CoV research from 2012 to 2015 is shown in Table <xref rid="Tab4" ref-type="table">4</xref>. Among the top 10 institutes, 4 institutes are from the USA, 2 from KSA; and one from Hong Kong, Netherland, UK, China and Germany respectively. The <italic>University of Hong Kong</italic> had the maximum contribution in terms of the total volume of publications with 68 articles, followed by the Ministry of Health Saudi Arabia in KSA (63 articles) and <italic>Erasmus University Medical Center</italic> in Netherland (47 articles).<table-wrap id="Tab4"><label>Table 4</label><caption><p>The top 10 highly productive and influential institutions in research on MERS-CoV field</p></caption><table frame="hsides" rules="groups"><thead><tr><th>SCR<sup>a</sup></th><th>Institution, country</th><th>No. of publications (%)</th></tr></thead><tbody><tr><td>1st</td><td>The University of Hong Kong, Hong Kong</td><td>68 (7.7)</td></tr><tr><td>2nd</td><td>Ministry of Health Saudi Arabia, KSA</td><td>63 (7.1)</td></tr><tr><td>3rd</td><td>Erasmus University Medical Center, Netherland</td><td>47 (5.3)</td></tr><tr><td>4th</td><td>Universitat Bonn, Germany</td><td>37 (4.2)</td></tr><tr><td>5th</td><td>University College London, UK</td><td>36 (4.1)</td></tr><tr><td>6th</td><td>Centers for Disease Control and Prevention, USA</td><td>30 (3.4)</td></tr><tr><td>7th</td><td>The University of North Carolina at Chapel Hill, USA</td><td>28 (3.2)</td></tr><tr><td>8th</td><td>Fudan University Shanghai Medical College, China</td><td>27 (3.1)</td></tr><tr><td>8th</td><td>Alfaisal University, KSA</td><td>27 (3.1)</td></tr><tr><td>10th</td><td>New York Blood Center, USA</td><td>26 (2.9)</td></tr><tr><td>10th</td><td>Indiana University School of Medicine Indianapolis, USA</td><td>26 (2.9)</td></tr></tbody></table><table-wrap-foot><p><italic>SCR</italic> standard competition ranking, <italic>KSA</italic> Kingdom of Saudi Arabia</p><p><sup>a</sup> Equal institutions have the same ranking number, and then a gap is left in the ranking numbers</p></table-wrap-foot></table-wrap></p></sec><sec id="Sec5" sec-type="discussion"><title>Discussion</title><p id="Par15">The current study showed a rapid increase in research activities related to MERS-CoV in the past 4 years. The USA and KSA were the most productive countries. These results are not surprising because the USA has played an important role in fostering international cooperation on MERS-CoV research and control due to the potential risk that this represents globally. Another possible explanation for this is that the USA is the most prolific country for scientific research in general in previous bibliometric studies [<xref ref-type="bibr" rid="CR19">19</xref>, <xref ref-type="bibr" rid="CR32">32</xref>–<xref ref-type="bibr" rid="CR36">36</xref>]. It seems possible that these results are due to its size and economic strength. The ten most prolific countries that were involved in MERS-CoV research contains new nations different from the familiar global ranking [<xref ref-type="bibr" rid="CR47">47</xref>]. Through the current study, KSA leadership in MERS-CoV global research (12.8 % of the total) clearly stands up, most likely due to the fact that it was in this country where the virus originally isolated [<xref ref-type="bibr" rid="CR5">5</xref>] and several outbreaks have been reported in this country [<xref ref-type="bibr" rid="CR10">10</xref>, <xref ref-type="bibr" rid="CR15">15</xref>, <xref ref-type="bibr" rid="CR48">48</xref>–<xref ref-type="bibr" rid="CR51">51</xref>]. Other countries as those located in the Asia-Pacific such as China, and South Korea have also increased their scientific MERS-CoV research output in the last year owing their new outbreaks [<xref ref-type="bibr" rid="CR8">8</xref>, <xref ref-type="bibr" rid="CR52">52</xref>–<xref ref-type="bibr" rid="CR56">56</xref>].</p><p id="Par16">In the current study, the most commonly language used in MERS-CoV research is English. Additionally, it is because English is now used extensively and is considered one of the most widespread language in the world [<xref ref-type="bibr" rid="CR57">57</xref>], and the majority of journals indexed in <italic>Scopus</italic> are published in English.</p><p id="Par17">The findings of this study recognize the publications associated with the most important developments in the field of MERS-CoV. This bibliometric analysis reveals that the most cited article in MERS-CoV is the 2012 paper by by Zaki et al [<xref ref-type="bibr" rid="CR5">5</xref>], in <italic>New England Journal of Medicine.</italic> This article reported the first isolated MERS-CoV in June 2012 from a Saudi male aged 60 years [<xref ref-type="bibr" rid="CR5">5</xref>]. The second most cited article was written in 2013 by Assiri et al [<xref ref-type="bibr" rid="CR40">40</xref>]. The authors reported a total of 23 cases related to MERS-CoV infection in the eastern region of KSA. Furthermore, the 2 most highly cited articles were published in a relatively high-IF journal (<italic>New England Journal of Medicine</italic>), which has an IF of 55.873. Some previous study showed that the IF of the journal was the strongest marker for citations [<xref ref-type="bibr" rid="CR58">58</xref>–<xref ref-type="bibr" rid="CR60">60</xref>]. Findings of this study verify the close relationship between IF and citations, and that the most cited articles are usually published in journals that top the IF list, which also helps keep the high IF of these journals [<xref ref-type="bibr" rid="CR60">60</xref>]. However, the <italic>h-</italic>index was launched in 2005 [<xref ref-type="bibr" rid="CR38">38</xref>] which have been used to quantify of quality and impact of the scientific research output of a researcher, countries, institutions, and journals. The <italic>h-</italic>index was used in the current study for the top 10 countries. Of the top 10 countries, 5 had an <italic>h-</italic>index of 20 or more.</p><p id="Par18">The large impact on scientific research output in reference to MERS-CoV research replicates its global influence as a potentially harmful disease. The most interesting finding of this study was that the total number of publications with the international collaboration for each country are a bit greater than that found in earlier bibliometric reports in different fields [<xref ref-type="bibr" rid="CR33">33</xref>, <xref ref-type="bibr" rid="CR34">34</xref>, <xref ref-type="bibr" rid="CR36">36</xref>]. While these earlier bibliometric studies have described the importance of global collaboration, which considered as the most effective strategy to increase citation rates [<xref ref-type="bibr" rid="CR36">36</xref>, <xref ref-type="bibr" rid="CR61">61</xref>–<xref ref-type="bibr" rid="CR63">63</xref>]. Moreover, the global map of scientific collaboration networks and production lets researchers to contribute for implementation of new strategy for controlling MERS-CoV outbreaks to reduce morbidity and mortality related with such outbreaks [<xref ref-type="bibr" rid="CR10">10</xref>, <xref ref-type="bibr" rid="CR40">40</xref>, <xref ref-type="bibr" rid="CR50">50</xref>]. Furthermore, collaborative research clearly demonstrates the prioritization in searches for a appropriate vaccine as well as effective medications for treatment of MERS-CoV [<xref ref-type="bibr" rid="CR64">64</xref>, <xref ref-type="bibr" rid="CR65">65</xref>].</p><p id="Par19">The most important limitation lies in the fact that the <italic>Scopus</italic> database was used to search for MERS-CoV. So publications indexed in none <italic>Scopus</italic>-cited journals were not studied. Another possible limitation to this study is the use of absolute number of citations in ranking the articles, instead of rankings based on average number of citations per year. Furthermore, the number of research output in 2015 may be rising because Scopus is still open for new journals issues from this year.</p></sec><sec id="Sec6" sec-type="conclusion"><title>Conclusions</title><p id="Par20">Based on the <italic>Scopus</italic> database, the characteristics of the MERS-CoV research output from 2012 to 2015 are investigated by means of bibliometric methods. There is a rapid increase in research activities related to MERS-CoV from 2012 to 2015. This study demonstrates that the MERS-CoV related literature has grown to be more extensive and global over the past 4 years. The bulk of publications in the field of MERS-CoV research are published by high-income countries such as the USA. Furthermore, the USA, the UK and KSA may have higher quality of articles according to the value of <italic>h-</italic>index. These findings show the value of bibliometric method to illustrate global research trends of MERS-CoV. Thus, this study provides a helpful reference for medical virologists and epidemiologists, policy decision makers, academics, and MERS-CoV researchers. As MERS-CoV can be considered a recent emerged disease, and a new research topic, the study results characterize a ‘snapshot’ of this field at an early stage in its development.</p></sec><sec id="Sec7"><title>Abbreviations</title><p id="Par21">HCoV-EMC/2012, Human Coronavirus Erasmus Medical Center/2012; IF, impact factor; IRB, institutional review board; KSA, Kingdom of Saudi Arabia; MERS-CoV, Middle East respiratory syndrome coronavirus; SCR, standard competition ranking.</p></sec></body><back><ack><title>Funding sources</title><p>No funding was received for writing this study.</p><sec id="FPar2" sec-type="data-availability"><title>Availability of data and materials</title><p id="Par22">Not applicable.</p></sec><sec id="FPar3"><title>Authors’ contributions</title><p id="Par23">SZ conceptualized, designed the methodology, and implemented the study, and did the analysis and write-up. Then read, and approved the final manuscript.</p></sec><sec id="FPar4" sec-type="COI-statement"><title>Competing interests</title><p id="Par24">The author declares that he has no competing interests.</p></sec><sec id="FPar5"><title>Consent for publication</title><p id="Par25">Not applicable.</p></sec><sec id="FPar6"><title>Ethics approval and consent to participate</title><p id="Par26">As a bibliometric analysis, as there were no patients involved in this study, there was no need for institutional review board (IRB) approval and it was exempted.</p></sec></ack><ref-list id="Bib1"><title>References</title><ref id="CR1"><label>1.</label><element-citation publication-type="journal"><person-group 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