So in summary, level of protection against delta variant depends. If you had COVID, your level of protection is probably mediocre, but will likely fade with time. If you had just the vaccines, its probably more of the same, but in comparison, likely stronger protection. If you had COVID and the vaccine, your protection is likely through the roof, and probably would not need a booster anytime soon, but that is strictly my opinion at the time of me recording this video. Because that level of protection would likely be the same as someone who has not had COVID, but has had the mRNA vaccine in addition to the booster. But time will tell, and more studies on delta variant will come out soon.