Health professionals call this time the infectious period.. Children can have an even longer infectious period than adults. They are infectious for about 2 days before they get sick until 10 days after.Since sometimes you can start spreading the flu before you know you are sick, or while you are still in the flu incubation period, it can be difficult to prevent other people from getting other people sick.ealth professionals call this time the infectious period.. Children can have an even longer infectious period than adults. They are infectious for about 2 days before they get sick until 10 days after.
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