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The plague is spread by flease.
Rats simply carry the flies.
It cannot break out today simply as we bath and do not wear untreated clothes.
When the plague first spread, the flies could easily live in out clothes. Plus we were much closer to the rats that carried the fies.
We do not come into contact with rats as we once did. And rat population is not as dense as it was.
The conditions are simply not there these days for it to spread.
But as I say its not the rats that spread it (they unfaily get the blame) its the flies that lived on the rats.
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