In the trial, the third dose elicited significantly higher neutralizing antibodies against the initial SARS-CoV-2 virus compared to the levels observed after the two-dose primary series, as well as against the highly infectious Delta variant.
However, the decision by a few rich countries to buy booster shots has drawn the ire of health activists and the World Health Organization, which has called for a moratorium on boosters until at least the end of September.
Pfizer and BioNTech had said that all patients in the trial received the third shot, BNT162b2, eight to nine months after their second dose. The drugmakers will submit the trial data to the European Medicines Agency and other regulatory authorities in the coming weeks. They said results from a late-stage trial of the third dose are expected shortly.
Last week, U.S regulators authorized a third dose of COVID-19 vaccines by Pfizer-BioNTech and Moderna Inc for people with compromised immune systems who are likely to have weaker protection from the two-dose regimens. Our goal is to create a safe and engaging place for users to connect over interests and passions. In order to improve our community experience, we are temporarily suspending article commentingU.S. health officials have authorized https://www.reuters.
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