A member asked:

What if you took a flu shot when you had a cold and a sinus infection?

10 doctors weighed in across 2 answers

See below: The vaccine would still be effective.

Answered 10/25/2019

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Doesn't matter: Your immune system responds to a vaccine as a total body response, and does so regardless of any localized problem like a cold or sinus infection. The immune system can react to and process challenges by dozens of agents at the same time & does so routinely.

Answered 12/11/2017

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Related Questions

A member asked:

Could I have a sinus infection and the flu?

A doctor has provided 1 answer