Volume 11, Number 1—January 2005
Norovirus and Foodborne Disease, United States, 1991–2000
|Place (reference)||Years of data||No. of foodborne outbreaks||Method used to attribute to NoV||% of foodborne outbreaks attributable to NoV|
|United Kingdom (31)||1995–1996||341||Electron microscopy||6|
|Sweden (29)||1994–1998||92||Electron microscopy||72|
|United States (6)||1982–1989||1049||Epidemiologic criteria||33|
|United States (8)||1981–1998||295||RT-PCR and epidemiologic criteria||41|
|United States§||2000||600||RT-PCR and extrapolation||50|
*RT-PCR; reverse transcription–polymerase chain reaction.
†N. Boxall, pers. comm.
‡Y. van Duynhoven, pers. comm.
1Efforts in 1998 to improve outbreak reporting resulted in more outbreaks being retrospectively attributed to this period. The current figures for 1993 to 1997 are 65 (2%) of 3,257 outbreaks attributable to NoV and 67% of unknown etiology.
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