Influenza is contagious.
Influenza is caused by infection with influenza viruses, such as influenza A virus and influenza B virus. It can be spread through respiratory droplets and is a contagious disease that is highly infectious and spreads quickly.
Influenza is usually spread in spring and fall. It can cause aggregated infections and should be prevented. You can prevent the transmission of influenza by wearing a mask, washing hands frequently, keeping doors and windows ventilated, disinfecting the environment, and avoiding crowded places.
Influenza is contagious, especially for people with low immunity, and can easily develop into severe influenza, so these people can be prevented by vaccination against influenza virus.