Influenza generally refers to the flu, and influenza is generally contagious to other people. Influenza is an acute respiratory infection caused by the influenza virus. Influenza viruses are highly contagious after being introduced into the population, mainly through droplet transmission, but also indirectly through contact with contaminated hands, daily utensils and so on. Because the antigen is prone to mutation and is mainly transmitted by the respiratory tract, influenza is highly susceptible to epidemics and pandemics. The incubation period of influenza is usually 1 to 3 days, with the shortest period being a few hours and the longest period being 4 days. Clinical symptoms are usually more severe than those of the common cold, and may include high fever, chills, headache, diarrhea, abdominal pain and other symptoms of varying degrees. Antiviral therapy should be given as prescribed. Influenza viruses are more sensitive to neuraminidase inhibitors and commonly used drugs include oseltamivir and zanamivir. During influenza epidemics, ventilation and disinfection of the environment should be strengthened, and personal hygiene should be observed to prevent infection of influenza virus in the body. If any discomfort occurs, please do not self-medicate, and should be diagnosed and treated under the guidance of a doctor.