https://www.who.int/emergencies/diseases/novel-coronavirus-2019/advice-for-public/when-and-how-to-use-masks
(everyone sneezes or coughs once in a while - ?????) - maybe they mean
to say 'if you are sneezing or coughing repeatedly" - or more than
normal
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typical flu or cold victim is contagious 1 day before symptoms appear
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