According to records, the success of smallpox vaccine was attributed to the British doctor Edward? Chen Na, when he was a child, his village suffered from smallpox virus. Seeing that most people had died, he decided to study medicine. When she grew up, Qin Na happened to find that all the milkmaids in a dairy farm had no smallpox, but only some cowpox on their hands. He guessed that the milkman would not get smallpox because of these vaccinia, so he took some pus from the vaccinia in the milkman's hand and inoculated a boy. Afterwards, he found that the boy was not infected with smallpox. In this way, smallpox vaccine-vaccinia was born. People will leave scars on their arms after vaccination.
Smallpox is also recorded in China. During the Wei and Jin Dynasties, doctors at that time paid attention to smallpox as an infectious disease and devoted themselves to how to treat and prevent it. Vaccination was also used to treat smallpox in ancient China, compared with Edward? There are different kinds of vaccinia in Qinna. Doctors in ancient China used pox scab method. They took some scabs from smallpox patients and cultured them in utensils. After cultivating bean sprouts, put them in the nasal cavity with new cotton. After being left for a period of time, people will be infected with slight smallpox and go through minor processes such as smallpox and fever until they are cured. In this way, the human body will gain immunity to smallpox and will not be infected with smallpox again.
After 1980, people stopped vaccinating against smallpox. If the child has a scar on his arm, he may have been vaccinated with BCG.