Pfizer’s continuing global study of its clinical-trial participants shows that four to six months after the second dose, the vaccine’s effectiveness against symptomatic infection drops from a high of 95 per cent to 84 per cent, according to the company.
The vaccine remained more than 90 per cent effective in preventing severe disease and nearly as effective in preventing hospitalisation. Israel began offering a third Pfizer dose to citizens with severely weakened immune systems on July 12. Mr Fauci said he wanted to compare it with data that the CDC had been gathering from cohorts of thousands of people across the United States. “People are sort of raising their eyebrows a bit,” he said.The U.S. administration said it was taken aback by Pfizer’s announcement this month that it planned to seek emergency authorisation from the FDA for a booster shot.
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