The Food and Drug Administration, under fire for allowing hundreds of antibody tests for the new coronavirus on the U.S. market without prior review, has imposed rigorous precision standards on commercial test companies and said it is cracking down on fraudulent actors.

More than 200 antibody tests for Covid-19 entered the U.S. without previous FDA scrutiny on March 16, because the agency felt then that it was most important to get them to the public quickly. Accurate antibody testing is a potentially important tool for public-health…

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