Generally, viral colds are no longer contagious after they have been cured, but the exact duration needs to be determined by the severity of the disease. Viral cold is an infection of the upper respiratory tract caused by various viruses, which is contagious to a certain extent, and the main source of infection is the patient with a viral cold. The course of viral cold is usually about 1-2 weeks, and after the virus is cleared from the patient’s body and the disease is cured, it is no longer contagious. However, the specific healing time varies depending on the individual’s immune function and the severity of the disease. The more contagious period of viral cold is the early to mid-onset, that is, about 3-5 days after the infection, so once diagnosed with viral cold, patients need to wear a mask in time to avoid infecting others, and at the same time need to carry out targeted treatment under the guidance of a doctor.