Repeat: “If you get vaccinated in multiple years, you are more likely to get severe disease, you are more likely to get viral replication, and you are more likely to be hospitalized…. With the Delta variant– when you are vaccinated …. the antibodies take the virus and help it infect the cells.”
So how will the vaccinated fight new forms of the virus, after all, the vaccine is not a medicine that overpowers a particular pathogen. It is a subtle (genetic) reprogramming of the immune system that forces one’s cells to produce a particular version of the spike protein. Boosters that stimulate production of the same protein will have only modest impact. In short, boosters are still fighting the last war.