A 59-year-old female asked:
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how long do antibodies from a flu shot last? got a flu shot 3 yrs ago. exposed to norovirus 48 hours ago. arm aches at site of shot.

2 doctor answers
Dr. Gurmukh Singh
48 years experience Pathology
Normal reaction: Some soreness at the site of injection is normal. Flu shot does not produce antibodies to Nonovirus.
Answered on Sep 16, 2018
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Dr. James Ferguson
45 years experience Pediatrics
Some basics: The antibodies from a single flu shot last several years to the individual strains contained in the vaccine. That said, a new flu shot is needed every year because the flu changes (mutates) its genes often and new strains circle the globe every year. Norovirus is NEVER part of the flu shot and no norovirus vaccine is available. Any arm pain you have is likely unrelated to a shot you had 3 yrs ago
Answered on Sep 16, 2018
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