“疫苗”一词或许现在对许多老百姓而言是耳熟能详,尤其在非典、禽流感流行期间,这更是一个曝光率很高的词,在公众印象中,疫苗似乎是预防传染病的良器,但实际上恐怕很少有人真正了解疫苗是个什么东西。 The word “vaccine” may now be familiar to many people nowadays. Especially during the SARS epidemic, this is even more a word of high visibility. In the public opinion, the vaccine seems to be a good tool to prevent infectious diseases. But in fact I’m afraid few people really understand what a vaccine is.