Chickenpox is contagious from 1-2 days before the onset of the disease until the rash crusts over, and is especially contagious for 2-3 days after the onset of chickenpox. The virus is mainly found in the patient’s upper respiratory tract, herpes fluid, and blood. Chickenpox is a highly contagious acute infectious diseases, chickenpox from 1-2 days before the onset of the rash until the complete scab are contagious, mainly through the saliva droplet transmission, in addition to contact with the patient’s clothing, the patient used utensils, can be infected with chickenpox. Early infection can be manifested as chills, low fever, headache, fatigue, sore throat, etc., 1-2 days after the appearance of the rash, the rash is thin, easy to rupture, rupture can be scabs, scabs can be shed in about 1 week to heal, usually does not leave scars, the rash is not contagious after shedding. Chickenpox patients must be isolated to avoid contact with others. Chickenpox is a self-limiting disease, usually can be cured by itself, if the condition is serious, can be given antiviral drugs under the guidance of the doctor, in order to prevent the spread of the virus.