A study of healthcare workers finds that a second booster dose of Pfizer's COVID-19 vaccine did little to prevent Omicron infections.
The Food and Drug Administration and the Centers for Disease Control would have to approve the request for an additional COVID-19 booster dose for seniors.announcing its application to the FDA, Pfizer said an analysis of Israeli medical records showed that the rate of confirmed infections in people 60 and older who received a second booster was half that seen in their counterparts who had had only three doses of the vaccine.
As vaccine experts await a fuller account of the data cited by Pfizer, they pointed to the newly published Israeli study as evidence that any discussion of second-booster-for-all is premature.a fourth dose of mRNA vaccine In most people, two to three doses or mRNA vaccine have virtually eliminated the threat of an infection progressing to severe disease or death, Offit said. It will be difficult to demonstrate that the immune system needs more vaccine to protect itself against the SARS-CoV-2 virus, he added.
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