Boosters become less effective over a period of months, but they still provide protection.
decrease in effectiveness after about four months. Even then, however, the booster provided more protection from COVID-19 than you'd have without it.
The study looked at more than 241,000 COVID-related emergency department and urgent-care cases, as well as nearly 93,500 hospitalizations, spanning ten states. The data came in during a five-month period from August 2021 to January 2022, during whichin the US. Two months after the booster shot, the researchers found that vaccine effectiveness at preventing emergency-department or urgent-care visits was at about 87 percent; that decreased to 66 percent after four to five months.
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