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Too Late for the Flu Vaccine?

Flu viruses usually cause the most illness during the colder months of the year. In the United States, flu season is from October to May. Most cases happen from late December to early March.

It's best to get the flu vaccine early in flu season, ideally by the end of October. That way, the body has time to make antibodies that protect it from the flu.

What if you aren't vaccinated by then? Getting the vaccine later is better than not getting it at all. It's still flu season in January or February — even then it's not too late for you and your family to get the flu vaccine.

Date reviewed: September 2020