Polymerase chain reaction (PCR) and rapid (antigen) tests for COVID-19 both involve taking a swab. Results for a PCR test take longer, as it needs to go to a laboratory. It is more costly but tends to ...
For people with suspected community-acquired pneumonia (CAP) in the emergency department (ED), routine polymerase chain reaction (PCR) testing on lower respiratory tract samples led to faster and more ...
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