All around 900–1000 AD, Chinese have been the first to produce a method of vaccination, called variolation or inoculation, to prevent smallpox. Chinese physicians experienced realised that when wholesome people were being exposed to smallpox scab tissue, they had a lesser possibility of getting contaminated through the ailment afterwards. https://brooks2j25o.weblogco.com/23837126/the-ultimate-guide-to-chinese-medicine-asheville