The FDA approved the Pfizer vaccine for emergency use with a maximum of 21 days between the first and second doses. The spokesperson said the Working Group "concluded that vaccine efficacy will be maintained with dosing intervals longer than 21 days… based on clinical trial data that showed the vaccine was 90.5% effective against preventing COVID-19 after the first dose once the protection that starts at around 12 days kicks in, and there was no evidence to suggest that the effectiveness of the vaccine is declining towards the end of the 21-day period following the first dose."īut as the FDA and Pfizer have said, there's also no data to show that the effectiveness of the first dose lasts until the 12-week mark, or anything near it. FDA considers halving Moderna vaccine doses."The decision was made to update the dosage interval recommendations for the Pfizer-BioNTech vaccine following a thorough review of the data by the MHRA's COVID-19 Vaccines Benefit Risk Expert Working Group," a spokesperson for the U.K.'s Medicines and Healthcare Regulatory Agency told CBS News on Tuesday. Under government policy, the second doses of both vaccines can be put off for up to 12 weeks. The focus is now on getting as many people as possible a first dose of either the Pfizer shot or the other approved for use in the U.K., developed by Oxford University and AstraZeneca. Will vaccines work on South Africa COVID strain?. ![]() officials, by a more infectious strain of the coronavirus discovered in southeast England - British officials decided last week to change their inoculation strategy. ![]() The FDA warned in a statement on Monday that there was a "potential for harm" if people believed they were protected against COVID-19 by a first dose of Pfizer's vaccine for longer than available data demonstrate.įacing a dramatic surge in both infections and hospitalizations - fueled, according to U.K. ![]() Food and Drug Administration has suggested Britain's drug regulator may be gambling with public safety by expanding the time gap between administration of the first and second doses of Pfizer's coronavirus vaccine beyond that proven safe and effective by trial data.
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