>>Plagues of old were conquered - not by electron-microscopy, genetic know-how and vaccination but when people worked out how to avoid infection - and acted upon that knowledge.
And also once everyone had been infected you had the "surviving cohort"
Improving living standards have been the biggest change for most of them, and vaccines have pretty much made measles, diphtheria and polio vanish.
Malaria on the other hand...
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