A person might have such small traces of the virus after exposure a case isn't identified until days later, even using the most accurate and sensitive tests.
White House Press Secretary Kayleigh McEnany said she tested negative for COVID-19"every day since Thursday" – until she tested positive Monday.that causes COVID-19. A person might have such small traces of the virus after exposure a case isn't identified until days later, even using the most accurate and sensitive tests.
The widening outbreak of people connected to President Donald Trump brings new scrutiny to the White House's strategy, which relies on testing everyone who comes in close contact with the president. But experts say a coronavirus test is a just snapshot at any given moment. The most sensitive type of test is polymerase chain reaction, or PCR, which amplifies a small amount of DNA sample from a nasal swab. PCR tests are usually conducted at labs and can take days to process,PCR tests can usually detect a virus four days after a person is infected, Scanlan said.
The U.S. Department of Health and Human Services has purchased thousands of antigen testing machines and sent them to nursing homes. HHS also purchased 150 million rapid antigen strip tests calledBut antigen tests are less sensitive than PCR tests and often don't detect an infection until about seven days after a person has been infected, Scanlan said.
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