How effective are the RT-PCR tests when screening for COVID-19?

Until last year, it was not a widely known test outside medical circles. But ever since the coronavirus outbreak struck, the RT-PCR (real-time reverse transcription-polymerase chain reaction) test for COVID-19 has become common knowledge. How effective are the RT-PCR tests when screening for COVID-19? Most importantly, the only recognized Covid19 testing method by the World […]