Risk Factors for Norovirus Outbreaks Associated with Attack Rate and Genogroup

Noroviruses are the single most common cause of epidemic, non-bacterial gastroenteritis worldwide. NoVs cause an estimated 68-80% of gastroenteritis outbreaks in industrialized countries and possibly more in developing countries.

Objective

The purpose of this study was to identify global epidemiologic trends in human norovirus (NoV) outbreaks by transmission route and setting, and describe relationships between these characteristics, attack rates and the occurrence of genogroup I (GI) or genogroup II (GII) strains in outbreaks.