President Trump Received Experimental Antibody Treatment

Mr. Trump received a single dose of an antibody cocktail made by the biotech company Regeneron. The company’s C.E.O. has known the president for years.

President Trump has received a dose of an experimental antibody cocktail being developed by the drug maker Regeneron, in addition to several other drugs, including zinc, vitamin D and the generic version of the heartburn treatment Pepcid, according to a letter from his doctor that was released by the White House Friday afternoon.

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