The sensitivity of current RT-PCR testing for COVID-19 and overall test performance characteristics have not been reported clearly or consistently in medical literature. Researchers say doctors should expect a less visible second wave of coronavirus infections from people with false-negative test results.
Study reveals the official number of confirmed cases of coronavirus is dramatically understated. Data shows, due to insufficient and delayed testing, countries throughout the world have only discovered about 6% of COVID-19 cases. The true number of infections worldwide may already have reached several tens of millions.
COVID-19 was found in sputum up to 39 days, and feces up to 13 days after pharyngeal swabs were negative in recovered patients.