那你先给个疫苗的定义吧

是按老定义，防感染？

还是covid疫苗之后的新定义， 防重症？

这是新定义，covid疫苗后改的

老定义是防感染

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疫苗的定义见CDC Web Archives

网络是有记忆的，你自己看吧

https://apnews.com/article/fact-checking-976069264061

The AP was able to verify through web archivesthat the language on a CDC page titled “Immunization Basics,” has changed in these ways over time.

根据你的定义，CDC是可靠网站吧？

https://web.archive.org/web/20240000000000*/https://www.cdc.gov/vaccines/vac-gen/imz-basics.htm

仔细一点，你要的证明

CDC是可靠网站吧？

https://web.archive.org/web/20240000000000*/https://www.cdc.gov/vaccines/vac-gen/imz-basics.htm

CDC Web Archives 选择2015年前任何一个时间点

老的定义：

Vaccination: Injection of a killed or weakened infectious organism in order to prevent the disease.

Vaccine: A product that produces immunity therefore protecting the body from the disease. Vaccines are administered through needle injections, by mouth and by aerosol.

那你承认CDC改疫苗定义了？

我贴的那张图没造假吧？

既然是个疫苗科普贴，当然要先把疫苗定义的演化说清楚。COVID疫苗是不符合prevent disease这个标准的。