http://www.nytimes.com/2022/01/03/us...d-vaccine.html ...... "When Three Shots Are Not Enough" .....
https://www.cnn.com/2021/12/21/middl...ntl/index.html ..... "Israel begins fourth Covid-19 dose vaccine ..."
"Those eligible for the fourth dose can receive it provided at least four months have passed since the third dose, it said. In Israel, almost all vaccinated citizens have received the Pfizer/BioNTech vaccine."
I got my third vaccination on about Sept 10, about four months ago, and after four months the effectiveness supposedly starts to decrease? ...
You gotta read all the email comments, down the bottom on this NY Times report.