striker42
Well-known member
2 shots give 8 months of immunity how long will one booster last?
Two shots give antibodies that start out very high and then the effectiveness fades over 8 months. At the end of 8 months there is still a fairly good immunity, just not the extremely good immunity of right after the shot.
A booster probably gives another 8 months or maybe even more. The two shots are necessary for the initial vaccine because the first shot introduces the spike protein and the second stimulates the strong immune response. A booster stimulates another strong immune response, perhaps even a stronger one.
If you've already had covid, the first shot gives you the effect of the second. You have the strong immune response after the first shot as your body has already been introduced to it.
So boosters will likely be as effective as the initial vaccine with a chance of being more so. J&J apparently just did a study showing an even stronger response to the booster than the original vaccine.