Recall, if you dare, life in December 2020. America had just approved Covid-19 vaccines for use, but most of us wouldn’t get a shot for months. Instead, amid the second surge of coronavirus cases, ...
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.
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