群體免疫的前提:得過以後不會再被感染。問題這個免疫的強弱持續時間,目前木人知道哈。
所有跟帖:
• 這些確實是值得進一步思考與研究的問題 -LingYuan- ♂ (492 bytes) () 05/06/2020 postreply 05:53:02
• 這些確實是值得進一步思考與研究的問題 -LingYuan- ♂ (492 bytes) () 05/06/2020 postreply 05:53:02
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