A 19-year-old female asked:
just got flu shot yesterday after very possibly being exposed the day before. any way it could work before i get sick? or is it too late?
1 doctor answer

Dr. Donald Colantino answered
61 years experience Internal Medicine
May not protect: It may not protect you if you were truly exposed to that flu virus. However there is some hope as the incubation period may be a few days. Of course you could develop a mild reaction to the vaccine itself. Keep your resistance up by avoiding fatigue and dehydration.
Answered on Jan 14, 2017
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