> 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 anima

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