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A medical worker uses a nasal swab to test for Covid-19 in Harlem on April 20. (AP Photo/Seth Wenig) While many laboratories and companies are now offering tests, there are still only two main types available. The nasal swab test tells you if you have an active viral infection right now. A separate blood test tells you if you were previously exposed to the virus and fought off the infection.
Sign up for new weekly newsletter Closing Arguments to get the latest about ongoing trials, major litigation and hot cases and rulings in courthouses around the U.S. and the world.