I watched an old BBC programme (recorded from PBS America channel) about the Black Death. A fair number of people interviewed were presenting evidence that made them believe it was not an epidemic of bubonic plague. The speed of transmission, and written records describing it. ie viral. And............ The New Scientist published details of DNA tests (5 years ago) of skeletons. The researchers reported that there was a shift dating from the 14th century that looked like immunity to something. With 50% death rate, evolution would have favoured those DNA giving protection - herd immunity. And Bubonic Plague was rife in Victorian San Fransisco (also among those of European descent) - sorted by a programme of paying 10c for dead rats, & more for pregnant females.
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