打完牛痘疫苗就不感染牛痘了，那是疫苗。不防感染，防重症的，算“药”

来源: FionaRawson 于 2022-01-14 05:30:25 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

WENXUECITY.COM does not represent or guarantee the truthfulness, accuracy, or reliability of any of communications posted by other users.