Sadly, it's a moving target. After a number of months VE against infection falls off a cliff. VE against severe infection has decreased some 10%, but has not fell off a cliff. I don't know what the future will bring, I'm keeping a nervous eye on the situation. That Israel and FDA/CDC are clearly pushing for boosters is definitely not helping increase the confidence. They are in a much better position to glimpse at the future, and have decided for reasons they are not candidly sharing with the public that the vaccines as-is are not sufficient.