Smallpox vaccination is generally not necessary. Smallpox virus has caused serious damage to people all over the world in history, with a very high mortality rate during the pandemic period and great difficulty in treatment. However, there have been developments in medical technology since then, from the initial prevention of smallpox virus by cowpox inoculation to the introduction of smallpox vaccine, smallpox has gradually become extinct in the world. Smallpox vaccination is not necessary now because there is no sign of smallpox virus spreading in China. In the 1980s, the World Health Organization declared the smallpox virus extinct, and there have been no subsequent smallpox virus epidemics, so the smallpox virus is also extinct in China, and so you will not get infected with the smallpox virus under normal circumstances.