A 39-year-old female asked:
how long is an infant protected from the flu shot given to a pregnant woman in the 3rd trimester? i got the 4 virus version.
1 doctor answer
Dr. James Ferguson answered
45 years experience Pediatrics
Hard to be sure: The antibodies built during pregnancy are pushed into baby at a level higher per pound than mom retains. That said, all such antibodies begin to age out and become less effective with time. By 3-6 mo there is little if any left. Since there are always a few more flu strains circulating than the ones they can put in the vaccine, it is important to avoid exposure as the primary form of prevention
Answered on Dec 5, 2017
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