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According to new data from the Centers for Disease Control and Prevention (CDC), a booster dose of the COVID vaccine may only be effective for around four months. 

Collected during the Delta and Omicron surges, the data shows that vaccines were effective at preventing a higher number of hospitalizations during the first two months after a booster vaccine, but that effectiveness decreased by the fourth month after a booster.

https://www.fatherly.com/news/covid-boos...urth-dose/