A 46-year-old member asked:
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long does a flu shot last usually?

1 doctor answer
Dr. Joseph Roosth
34 years experience Internal Medicine
A year: Good question. The influenza virus mutates rapidly so each year's vaccine varies as each year's vaccine is based on the most prevalent flu strains from the last flu season. The actual immunity derived from a given flu shot probably lasts more than one year, but it is important to get a new shot each year, due to the changes.
Answered on Apr 25, 2015
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Related questions:

A 36-year-old member asked:
Dr. Martin Raff
55 years experience Infectious Disease
Influenza vaccine: Should not last beyond a day or two.
A 38-year-old female asked:
Dr. Edgar Mendizabal
54 years experience Internal Medicine
3 days: Shoulder discomfort might a little longer.
A 31-year-old female asked:
Dr. John Chiu
Dr. John Chiu answered
56 years experience Allergy and Immunology
Possibly...unlikely: The statement that you have anxiety provided a clue to your headaches. Flu shots do not cause illnesses even though they have been frequently accused. ... Read More
1
1 thank
A 30-year-old member asked:
Dr. Arti Jain
Dr. Arti Jain answered
24 years experience Pediatrics
1-2 days: Local adverse reactions like soreness, swelling and redness usually begin soon after the shot and last 1-2 days.
7
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