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Volume 9, Number 1—January 2003

Research

Two Epidemiologic Patterns of Norovirus Outbreaks: Surveillance in England and Wales, 1992–2000

Ben Lopman*Comments to Author , Goutam K Adak*, Mark Reacher*, and David W.G. Brown*
Author affiliations: *Public Health Laboratory Service, London, United Kingdom

Main Article

Figure 2

Seasonality of Norovirus outbreaks in residential homes and hospitals compared to all other settings, England and Wales, 1992–2000.

Figure 2. Seasonality of Norovirus outbreaks in residential homes and hospitals compared to all other settings, England and Wales, 1992–2000.

Main Article

Appendix: Surveillance and analysis definitions

Outbreak: an incident in which two or more people, thought to have a common exposure, experience a similar illness or proven infection, at least one of them being ill (22).
General outbreak: an outbreak that affects members of more than one household, or residents of an institution (36).
General outbreak of Norovirus: a general outbreak in which Norovirus is determined to be the causative agent by electron microscopy, RT-PCR, or enzyme immunoassay in one or more affected persons.
Residential facilities: includes residential homes, which provide some assistance in day-to-day living, and nursing homes, which provide care for persons whose infirmity or illness requires nursing care on a regular basis.
Food outlets: commercial food retailers including restaurants, pubs, bars, cafeterias, mobile food vendors, and caterers.

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