The abandonment of miasma theory, Kennedy bemoans, realigned health and medical institutions to "the pharmaceutical paradigm that emphasized targeting particular germs with specific drugs rather than fortifying the immune system through healthy living, clean water, and good nutrition".
As a consequence of this, I note, endemic disease that had been a constant for at least a few thousand years all but disappeared from the developed world within a century. So successful was this eradication of disease that it has ceased to be a constant fear on the mind of every person, and has become a political football.
As recently as the middle of the nineteenth century, going to hospital (for any reason) was a gamble that had a very good chance of ending in your death. Having a child meant about a one in three or four chance that you would have a funeral for them before their fifth birthday.
Today, people expect to come home from hospital visits, and it's ususlly a surprise if they don't. And people expect their children to reach adulthood as a matter of course - it comes as a terrible shock to hear of the death of a child, and if it does happen, it's usually due to an accident or a genetic abnormality, rather than to an infectious disease.
That's what the abandonment of miasma theory has led to.
No sane person would suggest going back to that lethal insanity, unless they were utterly ignorant of history. And we all know what those who are ignorant of history are doomed to, don't we?