Cases of norovirus, a stomach bug that causes vomiting and diarrhea, are on the rise in Canada and the U.S., and experts say there are easy steps we can take to protect ourselves. Dr. Zain Chagla, an infectious diseases specialist and associate professor at McMaster University in Hamilton, Ont., explains how norovirus spreads, as well as how steps like simple handwashing can keep us safe. 

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