Serveur d'exploration MERS

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Middle East respiratory syndrome coronavirus: quantification of the extent of the epidemic, surveillance biases, and transmissibility

Identifieur interne : 000066 ( PascalFrancis/Curation ); précédent : 000065; suivant : 000067

Middle East respiratory syndrome coronavirus: quantification of the extent of the epidemic, surveillance biases, and transmissibility

Auteurs : Simon Cauchemez [Royaume-Uni] ; Christophe Fraser [Royaume-Uni] ; Maria D. Van Kerkhove [Royaume-Uni] ; Christl A. Donnelly [Royaume-Uni] ; Steven Riley [Royaume-Uni] ; Andrew Rambaut [Royaume-Uni] ; Vincent Enouf [France] ; Sylvie Van Der Werf [France] ; Neil M. Ferguson [Royaume-Uni]

Source :

RBID : Pascal:14-0043018

Descripteurs français

English descriptors

Abstract

Background The novel Middle East respiratory syndrome coronavirus (MERS-CoV) had, as of Aug 8, 2013, caused 111 virologically confirmed or probable human cases of infection worldwide. We analysed epidemiological and genetic data to assess the extent of human infection, the performance of case detection, and the transmission potential of MERS-CoV with and without control measures. Methods We assembled a comprehensive database of all confirmed and probable cases from public sources and estimated the incubation period and generation time from case cluster data. Using data of numbers of visitors to the Middle East and their duration of stay, we estimated the number of symptomatic cases in the Middle East. We did independent analyses, looking at the growth in incident clusters, the growth in viral population, the reproduction number of cluster index cases, and cluster sizes to characterise the dynamical properties of the epidemic and the transmission scenario. Findings The estimated number of symptomatic cases up to Aug 8, 2013, is 940 (95% CI 290-2200), indicating that at least 62% of human symptomatic cases have not been detected. We find that the case-fatality ratio of primary cases detected via routine surveillance (74%; 95% CI 49-91) is biased upwards because of detection bias; the case-fatality ratio of secondary cases was 20% (7-42). Detection of milder cases (or clinical management) seemed to have improved in recent months. Analysis of human clusters indicated that chains of transmission were not self-sustaining when infection control was implemented, but that Rin the absence of controls was in the range 0?8-1?3. Three independent data sources provide evidence that R cannot be much above 1, with an upper bound of 1?2-1?5. Interpretation By showing that a slowly growing epidemic is underway either in human beings or in an animal reservoir, quantification of uncertainty in transmissibility estimates, and provision of the first estimates of the scale of the epidemic and extent of case detection biases, we provide valuable information for more informed risk assessment. Funding Medical Research Council, Bill & Melinda Gates Foundation, EU FP7, and National Institute of General Medical Sciences.
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A11 02  1    @1 FRASER (Christophe)
A11 03  1    @1 VAN KERKHOVE (Maria D.)
A11 04  1    @1 DONNELLY (Christl A.)
A11 05  1    @1 RILEY (Steven)
A11 06  1    @1 RAMBAUT (Andrew)
A11 07  1    @1 ENOUF (Vincent)
A11 08  1    @1 VAN DER WERF (Sylvie)
A11 09  1    @1 FERGUSON (Neil M.)
A14 01      @1 MRC Centre for Outbreak Analysis and Modelling, Department of Infectious Disease Epidemiology, Imperial College London @2 London @3 GBR @Z 1 aut. @Z 2 aut. @Z 3 aut. @Z 4 aut. @Z 5 aut. @Z 9 aut.
A14 02      @1 Institute of Evolutionary Biology, Ashworth Laboratories, University of Edinburgh @2 Edinburgh @3 GBR @Z 6 aut.
A14 03      @1 Institut Pasteur, Unit of Molecular Genetics of RNA Viruses, UMR3569 CNRS, Universite Paris Diderot Sorbonne Paris Cité @2 Paris @3 FRA @Z 7 aut. @Z 8 aut.
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C01 01    ENG  @0 Background The novel Middle East respiratory syndrome coronavirus (MERS-CoV) had, as of Aug 8, 2013, caused 111 virologically confirmed or probable human cases of infection worldwide. We analysed epidemiological and genetic data to assess the extent of human infection, the performance of case detection, and the transmission potential of MERS-CoV with and without control measures. Methods We assembled a comprehensive database of all confirmed and probable cases from public sources and estimated the incubation period and generation time from case cluster data. Using data of numbers of visitors to the Middle East and their duration of stay, we estimated the number of symptomatic cases in the Middle East. We did independent analyses, looking at the growth in incident clusters, the growth in viral population, the reproduction number of cluster index cases, and cluster sizes to characterise the dynamical properties of the epidemic and the transmission scenario. Findings The estimated number of symptomatic cases up to Aug 8, 2013, is 940 (95% CI 290-2200), indicating that at least 62% of human symptomatic cases have not been detected. We find that the case-fatality ratio of primary cases detected via routine surveillance (74%; 95% CI 49-91) is biased upwards because of detection bias; the case-fatality ratio of secondary cases was 20% (7-42). Detection of milder cases (or clinical management) seemed to have improved in recent months. Analysis of human clusters indicated that chains of transmission were not self-sustaining when infection control was implemented, but that Rin the absence of controls was in the range 0?8-1?3. Three independent data sources provide evidence that R cannot be much above 1, with an upper bound of 1?2-1?5. Interpretation By showing that a slowly growing epidemic is underway either in human beings or in an animal reservoir, quantification of uncertainty in transmissibility estimates, and provision of the first estimates of the scale of the epidemic and extent of case detection biases, we provide valuable information for more informed risk assessment. Funding Medical Research Council, Bill & Melinda Gates Foundation, EU FP7, and National Institute of General Medical Sciences.
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C07 04  X  FRE  @0 Pathologie de l'appareil respiratoire @5 37
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C07 04  X  SPA  @0 Aparato respiratorio patología @5 37
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<div type="abstract" xml:lang="en">Background The novel Middle East respiratory syndrome coronavirus (MERS-CoV) had, as of Aug 8, 2013, caused 111 virologically confirmed or probable human cases of infection worldwide. We analysed epidemiological and genetic data to assess the extent of human infection, the performance of case detection, and the transmission potential of MERS-CoV with and without control measures. Methods We assembled a comprehensive database of all confirmed and probable cases from public sources and estimated the incubation period and generation time from case cluster data. Using data of numbers of visitors to the Middle East and their duration of stay, we estimated the number of symptomatic cases in the Middle East. We did independent analyses, looking at the growth in incident clusters, the growth in viral population, the reproduction number of cluster index cases, and cluster sizes to characterise the dynamical properties of the epidemic and the transmission scenario. Findings The estimated number of symptomatic cases up to Aug 8, 2013, is 940 (95% CI 290-2200), indicating that at least 62% of human symptomatic cases have not been detected. We find that the case-fatality ratio of primary cases detected via routine surveillance (74%; 95% CI 49-91) is biased upwards because of detection bias; the case-fatality ratio of secondary cases was 20% (7-42). Detection of milder cases (or clinical management) seemed to have improved in recent months. Analysis of human clusters indicated that chains of transmission were not self-sustaining when infection control was implemented, but that Rin the absence of controls was in the range 0?8-1?3. Three independent data sources provide evidence that R cannot be much above 1, with an upper bound of 1?2-1?5. Interpretation By showing that a slowly growing epidemic is underway either in human beings or in an animal reservoir, quantification of uncertainty in transmissibility estimates, and provision of the first estimates of the scale of the epidemic and extent of case detection biases, we provide valuable information for more informed risk assessment. Funding Medical Research Council, Bill & Melinda Gates Foundation, EU FP7, and National Institute of General Medical Sciences.</div>
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<s1>FRASER (Christophe)</s1>
</fA11>
<fA11 i1="03" i2="1">
<s1>VAN KERKHOVE (Maria D.)</s1>
</fA11>
<fA11 i1="04" i2="1">
<s1>DONNELLY (Christl A.)</s1>
</fA11>
<fA11 i1="05" i2="1">
<s1>RILEY (Steven)</s1>
</fA11>
<fA11 i1="06" i2="1">
<s1>RAMBAUT (Andrew)</s1>
</fA11>
<fA11 i1="07" i2="1">
<s1>ENOUF (Vincent)</s1>
</fA11>
<fA11 i1="08" i2="1">
<s1>VAN DER WERF (Sylvie)</s1>
</fA11>
<fA11 i1="09" i2="1">
<s1>FERGUSON (Neil M.)</s1>
</fA11>
<fA14 i1="01">
<s1>MRC Centre for Outbreak Analysis and Modelling, Department of Infectious Disease Epidemiology, Imperial College London</s1>
<s2>London</s2>
<s3>GBR</s3>
<sZ>1 aut.</sZ>
<sZ>2 aut.</sZ>
<sZ>3 aut.</sZ>
<sZ>4 aut.</sZ>
<sZ>5 aut.</sZ>
<sZ>9 aut.</sZ>
</fA14>
<fA14 i1="02">
<s1>Institute of Evolutionary Biology, Ashworth Laboratories, University of Edinburgh</s1>
<s2>Edinburgh</s2>
<s3>GBR</s3>
<sZ>6 aut.</sZ>
</fA14>
<fA14 i1="03">
<s1>Institut Pasteur, Unit of Molecular Genetics of RNA Viruses, UMR3569 CNRS, Universite Paris Diderot Sorbonne Paris Cité</s1>
<s2>Paris</s2>
<s3>FRA</s3>
<sZ>7 aut.</sZ>
<sZ>8 aut.</sZ>
</fA14>
<fA20>
<s1>50-56</s1>
</fA20>
<fA21>
<s1>2014</s1>
</fA21>
<fA23 i1="01">
<s0>ENG</s0>
</fA23>
<fA43 i1="01">
<s1>INIST</s1>
<s2>27478</s2>
<s5>354000500748640140</s5>
</fA43>
<fA44>
<s0>0000</s0>
<s1>© 2014 INIST-CNRS. All rights reserved.</s1>
</fA44>
<fA45>
<s0>20 ref.</s0>
</fA45>
<fA47 i1="01" i2="1">
<s0>14-0043018</s0>
</fA47>
<fA60>
<s1>P</s1>
</fA60>
<fA61>
<s0>A</s0>
</fA61>
<fA64 i1="01" i2="1">
<s0>Lancet. Infectious diseases : (print)</s0>
</fA64>
<fA66 i1="01">
<s0>GBR</s0>
</fA66>
<fC01 i1="01" l="ENG">
<s0>Background The novel Middle East respiratory syndrome coronavirus (MERS-CoV) had, as of Aug 8, 2013, caused 111 virologically confirmed or probable human cases of infection worldwide. We analysed epidemiological and genetic data to assess the extent of human infection, the performance of case detection, and the transmission potential of MERS-CoV with and without control measures. Methods We assembled a comprehensive database of all confirmed and probable cases from public sources and estimated the incubation period and generation time from case cluster data. Using data of numbers of visitors to the Middle East and their duration of stay, we estimated the number of symptomatic cases in the Middle East. We did independent analyses, looking at the growth in incident clusters, the growth in viral population, the reproduction number of cluster index cases, and cluster sizes to characterise the dynamical properties of the epidemic and the transmission scenario. Findings The estimated number of symptomatic cases up to Aug 8, 2013, is 940 (95% CI 290-2200), indicating that at least 62% of human symptomatic cases have not been detected. We find that the case-fatality ratio of primary cases detected via routine surveillance (74%; 95% CI 49-91) is biased upwards because of detection bias; the case-fatality ratio of secondary cases was 20% (7-42). Detection of milder cases (or clinical management) seemed to have improved in recent months. Analysis of human clusters indicated that chains of transmission were not self-sustaining when infection control was implemented, but that Rin the absence of controls was in the range 0?8-1?3. Three independent data sources provide evidence that R cannot be much above 1, with an upper bound of 1?2-1?5. Interpretation By showing that a slowly growing epidemic is underway either in human beings or in an animal reservoir, quantification of uncertainty in transmissibility estimates, and provision of the first estimates of the scale of the epidemic and extent of case detection biases, we provide valuable information for more informed risk assessment. Funding Medical Research Council, Bill & Melinda Gates Foundation, EU FP7, and National Institute of General Medical Sciences.</s0>
</fC01>
<fC02 i1="01" i2="X">
<s0>002B05C02C</s0>
</fC02>
<fC03 i1="01" i2="X" l="FRE">
<s0>Analyse quantitative</s0>
<s5>07</s5>
</fC03>
<fC03 i1="01" i2="X" l="ENG">
<s0>Quantitative analysis</s0>
<s5>07</s5>
</fC03>
<fC03 i1="01" i2="X" l="SPA">
<s0>Análisis cuantitativo</s0>
<s5>07</s5>
</fC03>
<fC03 i1="02" i2="X" l="FRE">
<s0>Epidémie</s0>
<s5>08</s5>
</fC03>
<fC03 i1="02" i2="X" l="ENG">
<s0>Epidemic</s0>
<s5>08</s5>
</fC03>
<fC03 i1="02" i2="X" l="SPA">
<s0>Epidemia</s0>
<s5>08</s5>
</fC03>
<fC03 i1="03" i2="X" l="FRE">
<s0>Surveillance</s0>
<s5>09</s5>
</fC03>
<fC03 i1="03" i2="X" l="ENG">
<s0>Surveillance</s0>
<s5>09</s5>
</fC03>
<fC03 i1="03" i2="X" l="SPA">
<s0>Vigilancia</s0>
<s5>09</s5>
</fC03>
<fC03 i1="04" i2="X" l="FRE">
<s0>Coronavirus</s0>
<s2>NW</s2>
<s5>10</s5>
</fC03>
<fC03 i1="04" i2="X" l="ENG">
<s0>Coronavirus</s0>
<s2>NW</s2>
<s5>10</s5>
</fC03>
<fC03 i1="04" i2="X" l="SPA">
<s0>Coronavirus</s0>
<s2>NW</s2>
<s5>10</s5>
</fC03>
<fC03 i1="05" i2="X" l="FRE">
<s0>Syndrome respiratoire du Moyen-Orient</s0>
<s4>CD</s4>
<s5>96</s5>
</fC03>
<fC03 i1="05" i2="X" l="ENG">
<s0>Middle East respiratory syndrome</s0>
<s4>CD</s4>
<s5>96</s5>
</fC03>
<fC07 i1="01" i2="X" l="FRE">
<s0>Coronaviridae</s0>
<s2>NW</s2>
</fC07>
<fC07 i1="01" i2="X" l="ENG">
<s0>Coronaviridae</s0>
<s2>NW</s2>
</fC07>
<fC07 i1="01" i2="X" l="SPA">
<s0>Coronaviridae</s0>
<s2>NW</s2>
</fC07>
<fC07 i1="02" i2="X" l="FRE">
<s0>Nidovirales</s0>
<s2>NW</s2>
</fC07>
<fC07 i1="02" i2="X" l="ENG">
<s0>Nidovirales</s0>
<s2>NW</s2>
</fC07>
<fC07 i1="02" i2="X" l="SPA">
<s0>Nidovirales</s0>
<s2>NW</s2>
</fC07>
<fC07 i1="03" i2="X" l="FRE">
<s0>Virus</s0>
<s2>NW</s2>
</fC07>
<fC07 i1="03" i2="X" l="ENG">
<s0>Virus</s0>
<s2>NW</s2>
</fC07>
<fC07 i1="03" i2="X" l="SPA">
<s0>Virus</s0>
<s2>NW</s2>
</fC07>
<fC07 i1="04" i2="X" l="FRE">
<s0>Pathologie de l'appareil respiratoire</s0>
<s5>37</s5>
</fC07>
<fC07 i1="04" i2="X" l="ENG">
<s0>Respiratory disease</s0>
<s5>37</s5>
</fC07>
<fC07 i1="04" i2="X" l="SPA">
<s0>Aparato respiratorio patología</s0>
<s5>37</s5>
</fC07>
<fC07 i1="05" i2="X" l="FRE">
<s0>Virose</s0>
<s5>38</s5>
</fC07>
<fC07 i1="05" i2="X" l="ENG">
<s0>Viral disease</s0>
<s5>38</s5>
</fC07>
<fC07 i1="05" i2="X" l="SPA">
<s0>Virosis</s0>
<s5>38</s5>
</fC07>
<fC07 i1="06" i2="X" l="FRE">
<s0>Infection</s0>
</fC07>
<fC07 i1="06" i2="X" l="ENG">
<s0>Infection</s0>
</fC07>
<fC07 i1="06" i2="X" l="SPA">
<s0>Infección</s0>
</fC07>
<fN21>
<s1>048</s1>
</fN21>
<fN44 i1="01">
<s1>OTO</s1>
</fN44>
<fN82>
<s1>OTO</s1>
</fN82>
</pA>
</standard>
</inist>
</record>

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   |texte=   Middle East respiratory syndrome coronavirus: quantification of the extent of the epidemic, surveillance biases, and transmissibility
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