A CDC report found vaccine booster protection waned but remains strong amid the Omicron wave.
during the Omicron wave in the U.S. hinted at a decline in effectiveness, though the shots still offered strong protection against severe illness., published Friday by the Centers for Disease Control and Prevention, is considered an early and limited look at the durability of booster protection as Omicron exploded in December and January before beginning to fade in recent weeks.
The researchers looked at patient visits to hospitals and urgent care centers in 10 states. They estimated how well the Pfizer-BioNTech or Moderna booster shots prevented COVID-related visits to emergency departments and urgent care centers, and how well the vaccines prevented hospitalizations.About 10% of people in the study were boosted. Vaccine effectiveness was higher in people who had received boosters than in people who had received only the original series of shots.
Those results, however, were based on only a small number of patients — fewer than 200 — who had been boosted early. It’s unclear if those people had gotten boosters early for medical reasons that may have made them more vulnerable to severe illness. Health experts expect protection from the vaccines to wane. The U.S. booster campaign was based on evidence that emerged last year thatAnd from the beginning, vaccines have offered less protection against the Omicron mutant than earlier versions of the virus. The study couldn’t address how protection will hold up against the next variant to come along., a Vanderbilt University vaccines expert.
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