Thinking about COVID booster shots? Here's what to know
https://www.health.harvard.edu/blog/thinking-about-covid-booster-shots-heres-what-to-know-202110072610
Nov 30, 2021 · Ideally, vaccine boosters are given no sooner than necessary, but well before widespread protective immunity declines. The risks of waiting too long are obvious: as immunity wanes, the rates of infection, serious illness, and death may begin to rise. But there are downsides to providing boosters too early: Side effects might be more common.
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