Having symptoms after getting a COVID vaccine may indicate robust immune response

Headache, fatigue, malaise, and chills after COVID-19 vaccination are signs the immune system is marshalling a strong response against future infection, suggests a study posted today in the Annals of Internal Medicine. ...

"Generally, we found that the higher the number of side effects, the higher the level of antibodies," first author Ethan Dutcher, MD, PhD, said in a UCSF news release. "But this wasn't a hard rule: some people without side effects had better antibodies than some people with side effects."

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