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CDC chief Robert Redfield says that earlier testing for the coronavirus would have been like "looking for a needle in a haystack." But other health experts dispute his assertion.
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Tests for the immune response to the coronavirus are revealing thousands of people who were infected but never got severely ill. The findings suggest the virus is less deadly than it first appeared.
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The state of Ohio is conducting a study using antibody tests to learn more about COVID-19. Health officials say the study will include a broad range of…