Apparently the original vax used between 1957 and 1967 wasn’t strong enough to produce permanent immunity, so people vaxxed in those years are being told to get boosters. And between 1967 and 1978, everyone got a single shot for their vaccination, but they later decided it should have been a two-shot series, so one-shot vaxxed from those years are supposed to get boosters.
There’s a blood test that can tell if your immunity has waned, or you can just ask your doctor for a booster shot.
Apparently the original vax used between 1957 and 1967 wasn’t strong enough to produce permanent immunity, so people vaxxed in those years are being told to get boosters. And between 1967 and 1978, everyone got a single shot for their vaccination, but they later decided it should have been a two-shot series, so one-shot vaxxed from those years are supposed to get boosters.
There’s a blood test that can tell if your immunity has waned, or you can just ask your doctor for a booster shot.