Chickenpox is highly contagious, but is not contagious once the scabs have formed. Most patients recover and develop antibodies in their bodies that prevent them from contracting chickenpox, but latent viruses in the body can later be activated and cause shingles. Vaccination against shingles in middle-aged and elderly people can reduce the risk of having shingles in later life. Chickenpox is an acute respiratory infectious disease caused by varicella-zoster virus, which leads to generalized symptoms such as spots, papules, herpes and scabs, etc. The main incidence of the disease is in unvaccinated children and adolescents, and it will stop or be cured by itself at a certain stage. Chickenpox is divided into common type and severe type, the severe type of cases mostly occur in immunocompromised people, can be manifested as hemorrhagic chickenpox, gangrenous chickenpox, can be combined with encephalitis, pneumonia, etc., and the severe cases can be due to hemorrhagic or septicemia leading to death.