My hunch is that herd immunity is holding up in America.

来源: renqiulan 于 2023-01-05 07:49:56 [] [旧帖] [给我悄悄话] 阅读数 : (0 bytes)

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• That‘s right. I think mRNA vaccines are more effective. -妖妖灵- ♀ 给 妖妖灵 发送悄悄话 妖妖灵 的博客首页 (0 bytes) () 01/05/2023 postreply 14:25:27

• The 1918 flu pandemic provides a good rear view. -renqiulan- ♂ 给 renqiulan 发送悄悄话 (0 bytes) () 01/05/2023 postreply 15:52:21

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