Effectiveness against infections declined from 88% (95% CI 86–89) during the first month after full vaccination to 47% (43–51) after 5 months. Among sequenced infections, vaccine effectiveness against infections of the delta variant was high during the first month after full vaccination (93% [95% CI 85–97]) but declined to 53% [39–65] after 4 months.
I was waiting for Novavax but they kept delaying it constantly (they said summer, then autumn and now 2022), so I am keeping an eye on Medicago as well, since I think the protein subunit ones are hardier than the mRNA ones. Because the studies keep changing (moderna used to be the best, then they said pfizer was just as protective, then during delta they said JJ was good) its hard to predict what problems and which of the vaccines will be best suited to that environment. The best immunity seems to be from a natural infection so a mild infection that creates antibodies has been said to be the best protective (many self reported infections weren't covid, but the ones that had testing showed very protective long lasting effects), although I don't think that its worth it to risk long covid for this effect.
Despite all this, the monoclonal antibody treatment is very good. It is userful post infection or when you are worried about being exposed, its thousands of dollars per treatment (gov paid for it already and it won't cost you), but its something to keep in mind about its usage. The US is buying a lot of them for treatment you may want to make a note of it around you with this site. https://protect-public.hhs.gov/pages/therapeutics-distributi...