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norovirus
Hi Ian
Norovirus is normally not deadly. However, it can cause diarrhea and vomiting.
Importantly, it is highly contagious because only a small number of virus particles can cause an infection.
It is transmitted by the oral-fecal route, meaning a person ingests norovirus from a contaminated surface (such as food, water, hands, etc) that is contaminated with human feces.
For more information, please read https://www.cdc.gov/norovirus/index.html.
Mark