A vaccine is a substance containing a harmless form of the germs that cause a particular disease. It is given to people, usually by injection, to prevent them getting that disease.
She takes a vaccine against influenza every fall.她每年秋季接种流感疫苗。At a W.H.O. news conference, Marie-Paule Kieny, chief of the W.H.O.'s vaccine research initiative, estimated that the world's vaccine makers had the capacity to make a maximum of one to two billion doses of a new H1N1 vaccine within a year after getting a seed vaccine, which the C.D.C. is now working on.在新闻发布会上，世卫组织疫苗研究创制中心主任玛丽-保罗-克妮预测，在获得种苗后，疾病预防控制中心（C.D.C.）正在研制的新型H1N1疫苗有望在1年内达到最多20亿支的产量。（nytimes.com; May 6, 2009）
adj.
痘苗的;疫苗的
英英词典释义
Noun
1. immunogen consisting of a suspension of weakened or dead pathogenic cells injected in order to stimulate the production of antibodies