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2. Story of England: Medieval Invaders

Dan Snow's History Hit

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The Progression of Bubonic Plague

The plague is a disease that comes from the bacteria Yucinia pestis. It's a gram negative bacteria which likes to hang around in rodents and like to be moved about by the biting of fleas. A flea might come along and nibble on a rat and get a lift and find itself near a human being. Then it would start nibbling the human being and then the while it was doing that nibbling the bacteria could move across into the blood of the human. There it's like some warm there's lots to eat, there's lots of opportunities to replicate and it can really go to town and make itself known. If somebody had this bacteria inside them their body would want

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