A 30-year-old female asked:
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i got a flu shot last month and now i have flu how is that even possible.

2 doctor answers
Dr. Hunter Handsfield
52 years experience Infectious Disease
Vaccine not perfect: Three possibilities. First, the influenza vaccine isn't 100% effective; it reduces the risk, if exposed, by about 50-60% (but also tends to reduce severity if you get it). Second, there are several kinds of influenza; the vaccine protects against some but not all. Third, non-flu infections sometimes can cause very similar symptoms, so maybe your current illness isn't influenza at all.
Answered on May 13, 2018
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Dr. James Ferguson
45 years experience Pediatrics
Possibilities: In any flu season there will be at least 4-6 distinct strains of flu circulating the globe. The strains mutate often. At most, they can include 3-4 strains (more would weaken it). It must be given at least 3 weeks before exposure to trigger good immunity if the person is capable. You could easily get a strain not in the vaccine or not have developed adequate immunity in your case.
Answered on May 13, 2018
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