A member asked:
Had flu shot in mid november -- tested positive for influenza a after a very mild illness. how did i get the flu? am 22 weeks pregnant.
2 doctors weighed in across 2 answers
Partially effective: The fact that the illness was mild reflects that the vaccine was not completely ineffective. The flu virus adapts year to year and the vaccine is modified to account for this, some years more effectively than others.
Answered 1/21/2014
4.6k views
Aprox 80% effective: First the flu shot takes 3 weeks to build full immunity so next year take it late october this way when the season starts ( nov in the ne) you are ready. Influenza affects about 20% of the population an the vaccine gives about 80% immunity if correctly paired to the current strain. In your case you did get flu but had some immunity since it was mild. Stay hydrated!
Answered 4/22/2014
4.2k views
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