This winter has seen norovirus infections reach levels more than double last season's peak, with nearly 28% of tests returning positive, according to CDC data.
Test positivity rates are particularly troubling in the Midwest, spanning states from Kansas to Michigan, where norovirus cases have soared in recent weeks.
Despite most norovirus cases going unreported due to mild symptoms, tracking through positive testing rates shows alarming trends in virus spread across regions.
This season's early peak in norovirus infections marks a shift from recent trends where peaks were typically observed later, in March or April.
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