Its typical of vaccines for longer spacing to improve the efficacy. This is why for most vaccines you get your booster spread out by a lot more (like 1 year). S

Its typical of vaccines for longer spacing to improve the efficacy. This is why for most vaccines you get your booster spread out by a lot more (like 1 year). So generally speaking, the expectation was that it would improve efficacy and it did. Another study supporting "First doses first".