There's of course the original two shots, but I lose track if there have been two three or four booster shots afterwards. In any case, I think they're coming out with yet another one very shortly
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I think there was a "vaccine" for the original strain that was supposed to work. Then with delta it didn't work, so they called it a "2 shot vaccine". Then anything after the second shot is considered a "booster". And I think boosters wear off after 6 months, which is why you need to keep getting boosted. The high numbers I've seen are people 4 boosters. Plus the original two shots.