That's actually pretty good at preventing infection - 28.5% avoided infection completely, with the remainder clearly having a much more robust immunity than control.
E.g. one class of alternatives is PrEP which is very effective, well-tolerated in many patients, and depending on country, pretty affordable. Oh, maybe for various reasons, regularly getting and taking pills is difficult for some populations, and a series of injections makes more sense? Subdermal injections for PrEP are also in the works and look like they would work for more than a year.
I would love there to be a really highly effective vaccine. But PrEP sets the bar relatively high for a vaccine to actually be an improvement, right?
https://www.cdc.gov/hiv/risk/prep/index.html https://www.aidsmap.com/news/mar-2021/reformulated-islatravi...