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Description
You can start spreading a cold about 12 days before symptoms, and usually remain contagious for several days, with the highest risk of passing it on in the first 23 days after symptoms begin, when they are at their worst.With flu, most people are contagious from about 1 day before symptoms up to roughly 57 days after they start, and they are generally most infectious during the first 34 days
Bulock, L
Strinic, Dean
F.HuD.-M
