Flu prevention: People don't get respiratory viruses from their groceries (except on rare occasions such as possibly when buying live animals as part of their meal plan). The risk of catching the flu (or coronaviruses like 2019-nCoV or MERS) is actually more due to close contact with sick humans at the grocery store. Washing hands before touching one's face or eating, or drinking, will help. Face masks do help.
Answered 2/1/2020
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