This stands for Real-Time Reverse Transcription Polymerase Chain Reaction (rRT-PCR) test. COVID-19 virus can be detected using Real-Time Reverse Transcriptase (RT)-PCR test (recommended by WHO), which can quickly tell if someone harbors the virus (5 to 7 hours). The RT-PCR test (Reverse transcription-polymerase Chain Reaction) is considered to relay the most accurate results for COVID-19 diagnosis. If you want to detect the virus’s presence, then the suspect’s nasal and throat swabs are collected. Researchers use an enzyme that converts the genetic material RNA in the virus to DNBA through a process called Reverse Transcription. A fluorescent signal in the RT-PCR machine marks the presence of the virus in the swab, even from asymptomatic patients