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>Leaky vaccines are a serious problem but only a small group of vaccines fit that definition and, so far, that's the only real example of it happening in animals at scale.

One problem is that BigPharmaCo has an extreme financial incentive to induce this scenario. They could turn every person on earth into a lifelong subscriber.

> Leaky vaccines are a serious problem but only a small group of vaccines fit that definition and, so far, that's the only real example of it happening in animals at scale

There is some evidence that one of the most common childhood vaccines, the acellular pertussis vaccine, may be in this category.

https://www.pnas.org/doi/10.1073/pnas.1314688110

As far as I know it's rare for vaccines to actually prevent transmission for viruses. This is why quite a few vets were extremely cautious about the covid vaccine. I think we got lucky that it didn't turn into a marek situation with covid. And it still could.