Infection with novel coronavirus generally has an incubation period from infection to onset, which is usually about 3-7 days, with onset within seven days being more common. The average onset date is usually about 4 days, but there are longer patients who exceed 14 days. In some cases, the incubation period is 24 days before the onset of disease, which is a rare case. There are also patients who develop symptoms the day after exposure, so generally the onset date and the degree of infection are not necessarily proportional to each other after infection with the new coronavirus. After the patient is infected, it is important to take isolation for the safety of other people because it is contagious. Once symptoms such as fever, dry cough, weakness and chest tightness appear during the isolation period, it is important to go to the hospital for examination and chest X-ray screening and coronavirus nucleic acid testing to clarify whether the patient is infected with the new coronavirus. Content source: Dr. You Lai