The new COVID-19 vaccines provide a boost to protection against hospitalization but that shielding wanes within months, according to unpublished data presented on Feb. 24.
A bivalent Pfizer or Moderna booster increased protection against hospitalization initially by 52 percent, but that protection dropped to 36 percent beyond 59 days, U.S. Centers for Disease Control and Prevention (CDC) researchers said.
The researchers separately looked at the protection people who had received two or more monovalent doses, or doses of the original vaccines, and no bivalent booster. They found that people aged 18 to 64 had just 19 percent protection against COVID-19 associated hospitalization and those aged 65 and older had just 28 percent protection….