Norovirus — Worldwide/Unknown
The researchers identified 39 studies from high income (HI) and upper-middle income (UMI) countries. 36 percent of publications provided risk estimates [of norovirus (NoV)-associated illness] based on laboratory-confirmed or epidemiologically-linked population-based surveillance data using molecular diagnostic methods.
Over the study period, estimated annual NoV rates and extrapolated number of cases among older adults in HI and UMI countries were: 29-120/10 000 or 1.2-4.8 million
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