Actually, vaccinia is not a medicine, but a virus. Vaccinia virus is a virus that can cause mild vaccinia lesions in cattle. If people are infected with the virus, they will only have slight discomfort and become resistant to vaccinia virus.
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Generally speaking, it is believed that smallpox was introduced to China by prisoners captured in the Han Dynasty War. So this disease is also called abscess. According to Ge Hong's "Elbow Back Rescue Recipe", smallpox was "obtained by attacking Nanyang Lu during Jianwu years, but it was almost a sore". However, some scholars do not agree with this statement, pointing out that "Nanyang" in Ge Hong's "Elbow Back for National Salvation" is a clerical error. It actually refers to the intersection of southern Xinjiang in China, where Ma Yuan, a general sent by Liu Xiu, Emperor Wu of the Han Dynasty, fought.
The description of smallpox is also recorded in the "Elbow after Salvation", which makes us clearly see the harm of this disease: "When I get sick when I am old, my head and body are covered with sores, and for a while it is like a fire, and it is full of white pulp. If it is not treated immediately, more people will die. Those who are badly treated will be purple and black, and they will only die when they are young. This is vicious. "
Popular science Ningxia-human pox inoculation method: the first shot to prevent smallpox