[vertex-four]

Quite possibly. On the other hand... we have immune systems for a reason - I see people in my developed country now who seem to become ill every month, and I do wonder whether our insistence on keeping a close-to-sterile environment has something to do with that. And in any case, there's more pressing issues like the general lack of clean water, even in many cities - all water should be boiled, but that doesn't always happen.