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How quick is it: These samples are generally sent to centralized labs for analysis, so it can take several days to get results back. And swabs can sometimes fail to pick up signs of active infection. However, a few days may pass before the virus starts replicating in the throat and nose, so the test won't identify someone who has recently been infected. How accurate is it: Generally speaking, these are the most reliable tests. Shots - Health News Antibody Tests For Coronavirus Can Miss The Mark That material is detectable when a person is actively infected. The test uses a technology called PCR (polymerase chain reaction), which greatly amplifies the viral genetic material if it is present. It looks for the genetic material of the coronavirus. The test may also work on saliva - that's under investigation. How it works: This test uses a sample of mucus typically taken from a person's nose or throat. This is the one we've been hearing so much about. What it does: Doctors use this test to diagnose people who are currently sick with COVID-19. Here's a quick guide to sorting out the pluses and minuses to each type of test. Antibody tests, which can identify people with signs of past infection, are starting to be available. But now other tests are appearing as well. The first and most urgent focus is on increasing access to tests to diagnose people with current infections.
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Testing for the coronavirus has been very much in the news. Updated May 9 to reflect Food and Drug Administration clearance of the first antigen test. Michael Nagle/Xinhua News Agency/Getty Images A COVID-19 antibody testing center is seen at Steve's 9th Street Market in Brooklyn on April 25.