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WASHINGTON – US government scientists are pushing back calls for single-dose regimens for two Covid-19 vaccines designed to be given with two injections, saying there is not enough evidence that a single dose offers a long term protection.
“It is essential that these vaccines be used as cleared by the FDA in order to prevent Covid-19 and associated hospitalizations and deaths,” Peter Marks, director of the Food and Drug Administration center that oversees vaccines, told Wall Street Newspaper.
The FDA approved a two-dose regimen for vaccines from Moderna Inc. and a partnership between Pfizer Inc. and BioNTech SE late last year. More recently he approved the use of a single dose regimen for a vaccine from Johnson & Johnson.
Some scientists and lawmakers have called for switching to a single dose regimen for all vaccines, citing preliminary studies showing that a single vaccine can be effective. They say switching to a single vaccine will allow the United States to speed up the pace of vaccinations.
In a March 2 letter to Acting Health and Human Services Secretary Norris Cochran on March 2, seven congressional physicians urged the department to “consider issuing a revised emergency use authorization as soon as possible ‘which could lead to single dose use of Pfizer and Moderna vaccines.
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