History, Jared Diamond notes, is full of diseases that 'once caused terrifying epidemics and then disappeared as mysteriously as they had come38'. He cites the robust but mercifully transient English sweating sickness, which raged from 1485 to 1552, killing tens of thousands as it went, before burning itself out. Too much efficiency is not a good thing for any infectious organism.
( Bill Bryson )
[ A Short History of Nearly ]
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