18世纪末,英国著名医生琴纳忙于解决天花这个难题。他研究了许多病例,仍然没能找到可行的治疗办法。后来,他把思路放到了那些未染上此病的人身上,最后,他从挤奶女工手上提取微量牛痘疫苗,接种到一位8岁男孩的胳膊上。一个月后,试验结果证明:琴纳找到了抵御天花的武器。 At the end of the 18th century, the famous British doctor Jenner was busy solving the problem of smallpox. He studied many cases, still failed to find a viable treatment. Later, he put his thoughts on those who had not contracted the disease. Finally, he took a small amount of vaccinia vaccine from the milking worker’s hand and inoculated himself into the arm of an 8-year-old boy. A month later, the test proved that Jenner found a weapon to defend the smallpox.