It isn't 1 in 1000, or we'd be confirming far more than a few hundred examples. The lack of examples isn't for lack of trying to find them -- immunity escape is

It isn't 1 in 1000, or we'd be confirming far more than a few hundred examples. The lack of examples isn't for lack of trying to find them -- immunity escape is currently the #1 pre-occupation of every national health service around the globe. The immune system works, and the failure cases here are truly exceptional, whereas the likelihood of rumor is high. Most of these "{my friend} got Covid twice" stories are either hearsay, or people imagining that their allergy symptoms were Covid, while never getting tested properly.