Norovirus cases are spiking this winter. Here's why — and what you need to know to protect yourself.

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• Norovirus cases are surging in the US at some of the highest levels in over a decade.
• More people are gathering together post-COVID, leading to a rise in cases from past years.
• Staying hydrated is the most important thing to do if you become sick.

Norovirus, commonly called the stomach flu or the 24-hour bug, is on the rise across the US this winter.