CDC 建議得過了新冠也要打疫苗。 和濃度沒關係，和自體免疫持續的時間長度有關。

 

如果是這樣，應該打之前查抗體，有抗體就不用打了。等以後抗體消失再打。這樣疫苗的利用率會高一些。

https://www.cdc.gov/coronavirus/2019-ncov/vaccines/facts.html

If I have already had COVID-19 and recovered, do I still need to get vaccinated with a COVID-19 vaccine?

Yes. Due to the severe health risks associated with COVID-19 and the fact that re-infection with COVID-19 is possible, vaccine should be offered to you regardless of whether you already had COVID-19 infection. CDC is providing recommendations to federal, state, and local governments about who should be vaccinated first.

At this time, experts do not know how long someone is protected from getting sick again after recovering from COVID-19. The immunity someone gains from having an infection, called natural immunity, varies from person to person. Some early evidence suggests natural immunity may not last very long.

We won’t know how long immunity produced by vaccination lasts until we have more data on how well the vaccines work.

Both natural immunity and vaccine-induced immunity are important aspects of COVID-19 that experts are trying to learn more about, and CDC will keep the public informed as new evidence becomes available.

所有跟帖： 

• 我有條件地反對這個，理由在下麵寫了 -dudaan- ♂ (0 bytes) () 01/12/2021 postreply 05:52:37

• 我和你的意見一致。不過如果有打和不打的選擇，可能立場就不同了 -SleepyLagoon- ♀ (0 bytes) () 01/12/2021 postreply 05:59:53

• 你的反對不是很堅決~~隻是優先順序的問題~~ -SwiperTheFox- ♂ (0 bytes) () 01/12/2021 postreply 06:38:20

• 你說得對，我用詞不當，已經改了 -dudaan- ♂ (0 bytes) () 01/12/2021 postreply 07:04:21