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Shigella bacilli has evolved in with human being. So data from more than a million years is not available. John snow noticed in 1854 in England that Cholera was spread in area supplied by one common pipe line. There after sanitation improved and water born diseases disappeared in developed countries. Before that practically every person must have suffered from shigella infection leading to immunity or rarely death.
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This bacteria can spread through sexual activity, preparing food with unwashed hands, toddlers who are not potty trained and many more ways, so always wash your hands and be careful!!
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Four different groups of Shigella can affect humans.
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