Background. Nucleic acid amplification tests are sensitive and specific for identifying Mycobacterium tuberculosis in sputum smear–positive populations, but they are less sensitive in sputum ...
Clinicians found that some patients had positive real-time fluorescence polymerase chain reaction (RT-PCR) test results for SARS-CoV-2 in the sputum or feces after the pharyngeal swabs became negative ...
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