the vaccine has been effective in preventing smallpox infection

回答: 天花疫苗,不会感染ahniu2022-01-21 20:52:51

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not 100%, only 95% for smallpox -Kwseeto- 给 Kwseeto 发送悄悄话 Kwseeto 的博客首页 (0 bytes) () 01/21/2022 postreply 22:35:17

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