Patients with novel coronavirus pneumonia are now found to have an incubation period of more than 42 days. The incubation period has been found to be the period from the time of infection to the onset of symptoms through screening of patients with novel coronavirus. The shortest incubation period is 1 day after infection, and the longest incubation period has been found to be more than 42 days, with an average incubation period of about 7-10 days. However, its only the existing knowledge of the virus, because people have never been exposed to the pathogenic microorganism before, the biological activity and virological characteristics are not completely clear, so the data are constantly changing. Generally for suspected people, or people who have been in contact with suspected people or who live in the infected area, medical isolation and observation is carried out for at least 14 days. If the patient does not show clear symptoms within these 14 days, he or she is generally considered not infected. However, at present, special observation is also carried out for special groups of people because the maximum period of infection is more than 42 days. Content source: Dr. You Lai