FDA Warns Against One-dose Regimen For Coronavirus Vaccines
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Scientists at the US Food and Drug Administration (FDA) are strongly against administering only single doses of the Moderna and Pfizer vaccines, as their efficacy has only been proven if people get two shots. "It is essential that these vaccines be used as authorized by FDA in order to prevent Covid-19 and related hospitalizations and death," Peter Marks, director of the FDA center that oversees vaccines, told.

In February, some scientists and lawmakers suggested using a one-dose regimen for all coronavirus vaccines approved in the US, after certain preliminary studies showed that a single shot could be enough for some people. "You would be flying blind to just use one dose," told FDA, adding "If you're going to do something else other than following the studies shown to the FDA, it should be proved that this one-shot effect is durable."

At the end of February, the FDA announced that it had given emergency use authorization to Johnson & Johnson's single-shot vaccine. The coronavirus vaccine was the third candidate to be given FDA approval, following authorization for two-shot vaccines produced by Pfizer and Moderna.

Source:
https://health.economictimes.indiatimes.com/news/diagnostics/fda-warns-against-one-dose-regimen-for-coronavirus-vaccines/81373925
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