No surprise. Killed virus vaccines (China, India) are less effective, but the supposedly better experimental mRNA and virus vector ones mostly target the spike protein.

So they try to block the entry point into the cell, but those vaccines do nothing about replication once it gets in. (Besides the spike protein being a toxin etc.) In most people, presumably the body can fight off low levels of virus entering, but maybe not for some people. Have CDC or anyone tested whether some people can / have become chronic carriers?

That's why everybody needs to care about their immune system health. Zinc, zinc, zinc, and a zinc ionophore.