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There were several reason that this disease was spread from person to person. People at this time had no idea that bacteria even existed. The cites were so very dirty. People would throw their "slops" into the street (feces and urine), there were no sewer systems. This disease was really due to the bite of fleas. The fleas were carried by rats from place to place. The saliva of the fleas had the bacteria. At times the bacteria got into the lungs of the person and this produced something called pneumonic plague. A cough would spread this even faster and further.

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12y ago

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