> How about bubonic plague a bacteria? That killed 1/3 of the
> population in Europe a while back. The best evolutionary solution bond
> came up with was hetero cystic fibrosis, the del 509 mutation as I recall.
It is carriers that are usefully resistent. More importantly in nature of
course is that diseases and resistance to them is an arms race.
Remember however that all of us are descended from forebears who survived
plague.
Geoff Manning
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