Whether the adult will be infectious to children mainly depends on the type of cold, the cold can be divided into common cold and influenza, the common cold is not contagious, while influenza is the common influenza A or B, which belongs to the respiratory tract infectious diseases, can be spread through respiratory droplets, so the adult’s influenza may be infectious to children. Therefore, it is best to do a good job of personal cleanliness as well as hand hygiene when adults have a cold. If you sneeze a lot, it is better to wear a mask. If an adult has a cold at a time when influenza is at its peak, such as when the seasons change, try to avoid direct contact with children or close contact.