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NHS24 - Health Information and Self Care Advice for Scotland
nhs24.com provides comprehensive up-to-date health information and self care advice for people in Scotland.
08454 242424
How quickly can flu spread?
After infection, it can take less than two days for symptoms to appear. This is the point when people are most infectious. Usually one person will pass the virus onto two other people. You can remain infectious to other people for up to seven days after you first developed the symptoms.
Centers for Disease Control and Prevention, Atlanta Georgia
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