People may have evolved to fight cholera

People may have evolved to fight cholera

Bangladeshis have genetic variations that might defend against the disease

By Nathan Seppa, 16:08 PM July 11, 2013

Some people in Bangladesh carry genetic alterations that seem to protect against cholera, a study shows. These changes apparently occurred over thousands of years as exposure to the disease exerted a form of natural selection on people in the Ganges River Delta.

Although cholera can cause lethal, dehydrating diarrhea, 60 to 90 percent of people infected with it experience few or no symptoms. That often happens when people have had prior exposure to the microbe that causes the disease, says Gle...

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