新冠疫苗的免疫是有时效的，不一定打一次就终身免疫。以后没有抗体了就需要第三针吧？

来源: 阿明. 于 2021-05-19 18:56:07 [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.