Chickenpox is an infectious disease, due to varicella-zoster virus infection. Chickenpox in human body is due to the existence of infectious agents, transmission routes, susceptible people. 1. Source of infection: chickenpox patients are the main source of infection, the human body can be infected with varicella-herpes virus can be latent in the body, can be latent for about 9~21 days. 2. Transmission way: when the human body contact with chickenpox patients, through direct contact (and chickenpox patients living together) or indirect contact (can be transmitted through droplet transmission, but also through the patient’s blister fluid or blister fluid contaminated objects) and infected. 3. Susceptible people: when the human body in the immune deficiency, newborns, pregnant women and long-term oral corticosteroids for chickenpox virus infection of high-risk groups. Chickenpox is an infectious disease, found that the body abnormalities, it is recommended to the regular hospital in time to avoid serious consequences.