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Scientists say a species of bacteria rewrites the history of when an infectious and potentially deadly disease first arrived in the Americas. And it was long before the arrival of European explorers.

Researchers from the Institut Pasteur in Paris, France, with help from a U.S. university, recently announced in a news release that a second species of bacteria is also responsible for the disease known as leprosy, or Hansen's disease, in the Americas.

In years past , many believed that the bacterium known as Mycobacterium leprae caused leprosy and that it was only spread in America by early European explorers and settlers.

However, the revelation of a second bacterium puts that theory of blaming the settlers on its head, as an existing strain was already on the contin

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