third dose: Why the need for a COVID 19 booster?

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Why eight months? What’s behind the timing of the covid booster shot

Thetimesofcapital.com18August2021/100 percentExperts said that new data about the third dose, which is expected from federal officials on Wednesday, The vaccine may be based on the decline in immunity seen in other countries.

By Erika Edwards and Elizabeth Chuck
Federal health officials are expected Wednesday to present evidence for why people are likely to need Covid-19 boosters eight months after their second doses of a vaccine, according to sources with the Centers for Disease Control and Prevention.

The eight-month time frame is most likely based on findings from both the U.S. and abroad looking at how the vaccines have held up over time β€” and whether they can stand up to the hypertransmissible delta variant of the coronavirus that has overtaken the country.

β€œDelta is forcing this discussion” on boosters, said Dr. Colleen Kraft, associate chief medical officer at Emory University Hospital in Atlanta.

The variant now accounts for nearly100 percent of new Covid-19 cases in the U.S., according to the CDC. The seven-day average of Covid-19 cases has soared by 700 percent since the beginning of July, when delta became the dominant strain in the U.S.

Questions remain about how well the vaccines fare against the delta variant, as well as whether protection simply wanes over time. Indeed, experts said they are eager to see any new data that led to the government’s proposed timeline for booster shots.

Data from countries that began their vaccination campaigns before the U.S. provide important clues to when boosters might be needed here.

Limited research from Israel, one of the first countries to begin widespread vaccination, which has almost exclusively used the vaccine from Pfizer-BioNTech, is likely to have played a role in the administration’s expected rollout of timing for booster doses, doctors said.

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