Covid-19 vaccine booster effectiveness wanes after four months but still offers protection, study finds
CNN
Booster doses of the Pfizer/BioNTech and Moderna coronavirus vaccines are safe, and they offer high levels of protection against severe Covid-19 even though that protection can wane over time, according to two studies published by the US Centers for Disease Control and Prevention on Friday.
Evidence of waning protection "reinforces the importance of further consideration of additional doses to sustain or improve protection" against Covid-19-linked hospitalizations and emergency department visits, one of the studies says.
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