Ducharme is a contributor to TIME. A health worker in Chile vaccinates someone with an AstraZeneca shot as a third booster dose against COVID-19 on Aug. 10, 2021. Ducharme is a contributor to TIME.
Why do some people get side effects after COVID-19 vaccines? Temporary side effects including headache, fatigue and fever are signs the immune system is revving up -- a normal response to vaccines.
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