Vaccines rock. You did know that, right?
我在一次全天的编辑委员会会议上，但我不能让这个滑倒。 “Benefits from Immunization During the Vaccines for Children Program Era — United States, 1994–2013” (emphasis mine): When the VFC program began in 1994, vaccines targeting nine diseases were provided: diphtheria, tetanus, pertussis, polio, Haemophilus influenzae type b
