New data confirm COVID vaccines still provide strong protection

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New data presented to a Centres for Disease Control and Prevention committee provided more evidence that the COVID-19 vaccines provided robust protection against severe disease through July, after the delta variant of the coronavirus had spread widely through the United States.

Scientists also confirmed that the Pfizer-BioNTech and Moderna shots confer a small risk of heart problems in younger men, but that the benefits still outweighed the risks, reports The New York Times.

At the committee’s meeting Monday, Dr Sara Oliver, a CDC scientist, presented unpublished data from COVID-Net, a hospital surveillance system. All three vaccines used in the United States remained highly effective at preventing hospitalisations from April through July, when delta became dominant, the data suggested.

For adults under the age of 75, the shots were at least 94% effective at preventing hospitalisations, a rate that has remained steady for months, Oliver said. Protection against hospitalisation did decline in July for adults 75 or older, but still remained above 80%.

“COVID vaccines continue to maintain high protection against severe disease, hospitalisation and death,” Oliver said.

Protection against infection or mild disease does appear to have declined somewhat in recent months, however. “These reasons for lower effectiveness likely include both waning over time and the delta variant,” she said.

The data comes in the midst of an ongoing debate about the necessity and timing of booster doses. On Aug 18, health officials recommended that adults who received either the Pfizer-BioNTech or Moderna vaccine get a third shot eight months after their second dose. If the Food and Drug Administration clears the booster shots, they will be available beginning Sept 20, top federal health officials have said.

The recommendation was based on data suggesting that the vaccines may become less effective at protecting against infection and mild disease over time. But the shots still work well against severe disease and death, and many scientists have criticised the plan for booster shots, saying that it’s not yet clear that they’re needed.

The CDC advisory committee will review additional data on the safety, effectiveness and potential need for booster doses at a meeting in September.