A health care worker conducts an antigen rapid test for the coronavirus during a mass screening in northern Spain, on November 21. | Cesar Manso/AFP/Getty Images

The treatment was given to Trump during the president’s bout with the virus in October.

Amid record levels of new Covid-19 infections and hospitalizations, the Food and Drug Administration announced Saturday that it would allow emergency use of an antibody drug treatment known as REGN-COV2 that helps immune systems fight the virus.

The treatment, developed by the biotech company Regeneron, consists of two antibodies, called casirivimab and imdevimab, that have shown promising results in reducing the severity of the coronavirus when given to patients who have not yet developed symptoms requiring hospitalization. Another similar treatment, made by drug giant Eli Lilly, was approved earlier this month.

The Regeneron treatment received widespread attention after it was