Seroprevalence of IgG antibodies to SARS-coronavirus in asymptomatic or subclinical population groups.

GM Leung; WW Lim; L-M Ho; T-H Lam; AC Ghani; CA Donnelly; C Fraser; S Riley; NM Ferguson; RM Anderson; +1 more... AJ Hedley; (2006) Seroprevalence of IgG antibodies to SARS-coronavirus in asymptomatic or subclinical population groups. Epidemiology and infection, 134 (2). pp. 211-221. ISSN 0950-2688 DOI: 10.1017/S0950268805004826
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We systematically reviewed the current understanding of human population immunity against SARS-CoV in different groups, settings and geography. Our meta-analysis, which included all identified studies except those on wild animal handlers, yielded an overall seroprevalence of 0.10% [95% confidence interval (CI) 0.02-0.18]. Health-care workers and others who had close contact with SARS patients had a slightly higher degree of seroconversion (0.23%, 95% CI 0.02-0.45) compared to healthy blood donors, others from the general community or non-SARS patients recruited from the health-care setting (0.16%, 95% CI 0-0.37). When analysed by the two broad classes of testing procedures, it is clear that serial confirmatory test protocols resulted in a much lower estimate (0.050%, 95% CI 0-0.15) than single test protocols (0.20%, 95% CI 0.06-0.34). Potential epidemiological and laboratory pitfalls are also discussed as they may give rise to false or inconsistent results in measuring the seroprevalence of IgG antibodies to SARS-CoV.


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