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Risk factors associated with superspreading events in SARS
Specialist Registrar in Respiratory Medicine, Royal infirmary in Edinburgh; alimohammed@doctors.org.uk
| The first 150 words of the full text of this article appear below. |
Yu IT, Xie ZH, Tsoi KK. Why did outbreaks of severe acute respiratory syndrome occur in some hospital wards but not in others? Clin Infect Dis 2007;44:1017–25.[CrossRef][Medline]
The severe acute respiratory syndrome (SARS) outbreak of 2003 originated in Hong Kong, China, and 71.1% of the subsequent infections in Hong Kong were attributable to superspreading events. Most of these superspreading events occurred in hospitals.
This case control study identified risk factors associated with outbreaks of SARS in hospital wards in Guangzhou and Hong Kong, China. Case wards were wards in which superspreading events occurred and control wards were wards in which patients with SARS were admitted, but no superspreading events occurred. A superspreading event was defined as the development of 
3 new cases of SARS in the 2–10-day period after the admission of an identifiable index patient, or the development of a cluster of 3
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