I have read that there is a new three-dose vaccine in China that is 99 percent effective. I heard it in a video from a Spaniard who lives there, I think you can see the video where he comments it with English subtitles. Here is the link in case you are interested.
https://www.youtube.com/watch?v=HAeAWWigEn0
Thank you for your great work Shin Jie