The viruses that cause colds are influenza virus, rhinovirus and parainfluenza virus. The common cold virus is only able to survive for a few to ten days after leaving the body. The cold virus can survive on the skin for three hours, and if the room is illuminated with ultraviolet lamps, it can kill the cold virus that remains in the air. Wash your hands before and after meals, disinfect your towels frequently, and expose them to sunlight to disinfect the virus on the towels through ultraviolet light. During the flu epidemic, do not go to public places where there are many people, such as places with poor air ventilation. At the same time, you should pay attention to indoor ventilation, mop the floor frequently to prevent dust from billowing, and bedding should be dried frequently. Usually, you should pay attention to exercise, enhance physical fitness and improve the body’s resistance to external viruses, which is a very good way to prevent influenza and colds.