Europeans and their African slaves brought strains of ulcer- and cancer-causing H. pylori bacteria that wiped out the local strains of these bacteria and may have led to the current high rates of disease in South America.
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from Innovation and Digital Marketing http://www.livescience.com/57998-europeans-brought-new-ulcer-bacteria-to-americas.html?utm_source=rss&utm_medium=rss
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