New data about a third dose, expected from federal officials as soon as Wednesday, may be based on a dip in vaccine immunity seen in other countries, experts said.
As for why the booster shots would be recommended at eight months, Singer said, “it’s not entirely clear, but it’s probably a combination of waning immunity over time and the fact the current circulating variants are just that much more contagious and spread that much more easily.”
Dr. Peter Hotez, dean of the National School of Tropical Medicine at Baylor College of Medicine and co-director of the Texas Children’s Hospital Center for Vaccine Development, said, “All we’re getting is snippets of data on the Israel Ministry of Health website.” He said he was curious whether, in addition to a decline in efficacy against mild infections, there was a significant drop in protection against hospitalizations for vaccinated people over time.
"The Israeli data is a snapshot, and I don't want to make a quick decision based on one snapshot,” Grabenstein said."I want to see multiple pictures, multiple views of the same thing, with the numbers beginning to coalesce around the same conclusion.”research
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