Varicella virus is varicella-zoster virus (VZV), varicella-zoster virus in vitro survival ability is weak, leaving the body in the air can survive about 0.5-1 hours, if the conditions are suitable, in low temperature can survive about 1 week, if in the herpes fluid -65 ℃, can survive about 8 years. Varicella-zoster is highly contagious, the population is generally susceptible, and can occur throughout the year, with a high incidence in winter and spring. The only source of infection is the patient with varicella, and the virus is present in the patient’s herpes fluid, blood and nasopharyngeal secretions, and can be transmitted outside the body by droplets and contact. Although the varicella zoster virus has a short survival time outside the body, it is still important to take precautions and give vaccinations if necessary. Patients with varicella need to isolate themselves well to reduce the spread of the virus. In addition, varicella zoster virus is acid- and heat-intolerant and sensitive to ether. Therefore, it can be inactivated at room temperature, 60 minutes, and a pH less than 6.2 or greater than 7.8.