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Volume 19, Number 8—August 2013

Dispatch

Genotype GI.6 Norovirus, United States, 2010–2012

Eyal LeshemComments to Author , Leslie Barclay, Mary Wikswo, Everardo Vega, Nicole Gregoricus, Umesh D. Parashar, Jan Vinjé, and Aron J. Hall
Author affiliations: Centers for Disease Control and Prevention, Atlanta, Georgia, USA

Main Article

Table 1

Mode of transmission and setting for norovirus outbreaks reported through CaliciNet, United States, 2010–2012

Characteristic GI.6 outbreaks, no. (%) n = 141 Non-GI.6 outbreaks, no. (%), n = 2,777 Rate ratio (95% CI)
Mode of transmission
Person-to-person 81 (57.4) 1,701 (61.2) 0.94 (0.81–1.08)
Foodborne 28 (19.9) 311 (11.2) 1.77 (1.25–2.51)
Waterborne 2 (1.4) 2 (0.1) 19.70 (2.80–138.80)
Other 0 15 (0.5) Not applicable
Unknown 30 (21.3) 748 (26.9) 0.79 (0.57–1.09)
Setting
Long-term–care facilities 51 (36.2) 1,715 (61.8) 0.59 (0.47–0.73)
Schools or daycare centers 23 (16.3) 198 (7.1) 2.29 (1.54–3.40)
Restaurants 20 (14.2) 258 (9.3) 1.53 (1.00–2.33)
Parties and events 17 (12.1) 153 (5.5) 2.19 (1.37–3.51)
Cruise ships 4 (2.8) 71 (2.6) 1.11 (0.41–3.00)
Hospitals 1 (0.7) 109 (3.9) 0.18 (0.03–1.29)
Other non–health care settings 20 (14.2) 202 (7.3) 1.95 (1.27–2.99)
Unknown 5 (3.5) 71 (2.6) 1.39 (0.57–3.38)

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