COVID-19 cellular pathogenesis in brief

Letter to editor: the most frequently used test for the diagnosis of covid‑19 is now reverse‑transcriptase polymerase chain reaction (rt‑pcr) executed by using nasopharyngeal swab specimens. the sensitivity of the severe acute respiratory syndrome (sars)‑cov‑2 rt‑pcr tests has been described around 70%. the test could usually detect the virus 2 or 3 days before the onset of infectious symptoms. it should be toughly noted that the rt‑pcr positivity does not mean an evidence of active and/or infectious virus. vice versa, a negative result of the rt‑pcr test does not exclude the sars‑cov‑2 infection.