A polymerase chain reaction (PCR) test detects genetic material from a pathogen or abnormal cell sample. Ways of collecting samples include a nasal swab, a saliva swab, or taking a sample of blood.
There are two main ways to test for infection with SARS-CoV2 (the coronavirus that causes COVID-19 disease). The first is a very sensitive test that looks for the RNA of the virus using a technique ...
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