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Antibody tests could be helpful in pinpointing the number of Washington residents who previously have had COVID-19, but they are not a “passport” for demonstrating that someone is immune, state and local government officials say.

The Food and Drug Administration earlier this week said companies that manufacture the tests will now have to demonstrate that they work before they are sold. The federal agency, which had allowed more than 100 commercial antibody tests to reach the market without review, said it took the step because some firms have marketed fraudulent test kits.