Bobby. wrote on Oct 12^th, 2022 at 2:33pm:


As the virus kept changing the effectivness of a vaccine meant for a different version of the virus is expected to be less effective as is the effectiveness over typically reduced over time.

This is the reason that there is always a new flu vaccine every season and that some are more effective than others. The Flu vaccine typically gives about 60% protection against infection but more effective against a serious case of the flu. Why would anyone expect for a covid vaccine to perform differently. Though it was significantly better than a flu vaccine - it had to be.