People with norovirus illness (aka stomach bug) can shed billions of norovirus particles. And only a few virus particles can make other people sick.
Important but uncomfortable message ahead....
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Norovirus can be found in your vomit or feces (poop) even before you start feeling sick. The virus can also stay in your feces for two weeks or more after you feel better. It is important to continue washing your hands often during this time.
Original source can be found here.
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