> Also why don't routine vaccinations in rich countries have a similar beneficial effect? Presumably, it's an issue with quantity. The ~20 mandatory vaccinati

> Also why don't routine vaccinations in rich countries have a similar beneficial effect? Presumably, it's an issue with quantity. The ~20 mandatory vaccinations in West are simply a drop in the bucket compared to the number of different organism/antigens you'd be exposed to without modern sanitation.