A FAQ: No vaccine is perfect. No vaccine is perfect; even the best will see post-vax infections at some rate. When there's a lot of virus around due to lower at large vax rates (like now), there's more of those events.
It's always been like this. Breakthrough cases of polio—including deaths—were common during early polio vaccination.
What kept us safe was not perfect vaccine efficacy. It was that Americans quickly & massively stepped up to get the imperfect vaccine, quashing transmission.
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