Infection with New Crown can usually be detected in about 7 days, while Omicron has a shorter incubation period and can usually be detected in 3~5 days after infection, but the longest incubation period of some mutated strains may reach about 20~30 days. Neocoronavirus has an incubation period of about 1 week after infection, but due to the constant genetic mutation of Neocoronavirus and the fact that some infected people may be asymptomatic, the infected person’s own perception is not strong. At the same time, the length of the incubation period is related to the characteristics of the mutated strain, viral load and personal constitution, some may take more than 5 days or even about 14 days to be finally detected. If symptoms similar to those of the common cold, such as fever and cough, occur, please judge whether or not you need to be tested and in what way according to your own situation, in order to determine whether or not the infection is caused by the new coronavirus.