I think that a combination of environmental control and the proper use of vaccines are
necessary. Unfortunately, today, there are those who claim vaccines cause autism and have other unsubstantiated misgivings about their use.

The use of vaccines in underdeveloped countries may outweigh their omission.
The quality control of medicine is a problem everywhere but the alternative is
anything from the black plague to rampant AIDS.

Medical science is never perfect. But even a little of the right stuff goes a long way to
stem infant mortality and rampant disease.