The virus is present in the mucous membrane of the upper respiratory tract and in the herpes fluid, and is contagious from 1-2 days before the onset of the disease (i.e., the last 1-2 days of the incubation period) until the rash is completely crusted over. Therefore, chickenpox may be contagious within the incubation period, but the time of contagiousness is relatively short, and it is at the end of the incubation period of 1-2 days. Since chickenpox can be transmitted through droplets and is contagious, it is easy to have an aggregated disease, so when there are chickenpox patients around, you need to pay attention to minimize contact and strengthen prevention, especially for children with low immunity. Try to open windows to keep fresh air circulating, and when cleaning and sanitizing, use disinfectant water for spraying. A more secure way to prevent chickenpox is to get vaccinated against chickenpox, which can make the body develop specific immunity and can effectively prevent chickenpox infection.