Neocoronavirus can be detected at any time as long as it is infected. Currently, real-time fluorescent RT-PCR is used for neocoronavirus nucleic acid testing. CDC staff use a pharyngeal swab to scrape a small amount of secretion from the human pharynx and bring it back to the CDC laboratory to detect the presence of the virus at the genetic level using reverse transcription-polymerase chain reaction (RT-PCR) technology. Patients in the incubation period are still infected even though they have no clinical symptoms. The new coronavirus is present in the body, but there may be false negatives due to insufficient viral load, the impact of the collection site and the sensitivity of the reagents, so the nucleic acid test should be repeated several times. Anyone with a relevant epidemiological history should take the initiative to report to their local CDC for centralized isolation for medical observation, during which they will participate in nucleic acid testing as required.