President Joe Biden's administration has ordered 14 additional states to stop using a COVID-19 treatment made by GlaxoSmithKline and Vir Biotechnology.
The Department of Health and Human Services (HHS) said on March 30 that it has paused shipments of the drug sotrovimab to the states, bringing the total number of states that are no longer receiving doses to 22.
The states are Illinois, Indiana, Michigan, Minnesota, Ohio, and Wisconsin in the Midwest; Arizona, California, Idaho, Nevada, Oregon, and Washington in the West; and Alaska and Hawaii.
The U.S. government purchased millions of doses in 2021 and in January and distributed them weekly to states to provide to health care facilities.
Sotrovimab, a monoclonal antibody, was granted emergency use authorization for treating patients with mild-to-moderate COVID-19 who are designated as at high risk for progressing to severe cases.
But emerging data suggest that the drug doesn't work against BA.2, a subvariant of the Omicron coronavirus variant, according to U.S. regulators.
The shipments were halted because of the ruling, which came from the U.S. Food and Drug Administration (FDA).
The FDA decided that any region where BA.2 is pegged as causing a majority of COVID-19 cases can no longer administer sotrovimab.
Testing indicates that other COVID-19 treatments retain some benefit against BA.2, including Pfizer's Paxlovid pill.
Bebtelovimab, another monoclonal that's produced by Eli Lilly, also appears to work against the subvariant.
Glaxo and Vir said in a recent joint statement that they were aware of the FDA's actions.
"GSK and Vir are preparing a package of data in support of a higher dose of sotrovimab for the Omicron BA.2 subvariant and will be sharing these data with regulatory and health authorities around the world for discussion," the statement reads.
The panel, convened by the National Institutes of Health to recommend treatments for the disease, advises administration of paxlovid and Gilead Sciences' remdesivir. In situations where neither are available, alternative therapies include bebtelovimab and Merck's pill molnupiravir.