Noroviruses are primarily transmitted via the fecal-oral route, either by direct person-to-person spread or by fecally contaminated food or water. They can also be spread via a droplet route from vomit, although this is less common than fecal-oral transmission.
Noroviruses are highly contagious, with infection requiring fewer than 10 virions. The virus is extremely stable in the environment and resists freezing temperatures, heat (up to 140°F [60°C]), acidic conditions, vinegar, alcohol, antiseptic hand solutions, high sugar concentrations, and disinfecting with chlorine.
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Cite this: Michael Stuart Bronze. Fast Five Quiz: Norovirus - Medscape - Sep 22, 2020.