TB's Arrival in New World: Blame Seals

New study also suggests TB is only 6K years old

By Shelley Hazen,  Newser Staff

Posted Aug 21, 2014 1:01 PM CDT

(Newser) – Tuberculosis may have reached the New World long before Christopher Columbus ever sailed the ocean blue, a new study suggests. Scientists have examined 1,000-year-old Peruvian bones mysteriously infected with TB—500 years before the arrival of Spaniards, who are historically blamed for bringing TB to the New World, Nature reports. "How did (TB) get to the Americas? We were joking: 'Was it flying? Was it swimming?' But then we saw it was indeed swimming. It was disseminated by seals," a study author tells the BBC. Researchers believe seals got TB in Africa—the same strain found in the Peruvian mummies—and swam to America after the land bridge between Asia and North America disappeared. Their contaminated meat was then eaten by Native Americans, Nature explains.

When the Europeans eventually arrived, they brought diseases—including a new tuberculosis strain—that killed 90% of the native population; the European TB strain remains today. The Peruvian strain has also helped scientists put a new date stamp on all modern TB strains: It's not 70,000 years as once thought, but less than 6,000 years old, reports the New York Times. This claim is making some scientists skeptical. One expert tells the Times that fossil evidence shows TB is older than 6,000 years—including the infected remains of a 9,000-year-old human and 17,000-year-old bison. (Last month, an arrest warrant was issued for a man who refused TB treatment.)

A harbor seal pup appears to yawn Sunday, July 20, 2014 on the shore of Puget Sound near Clinton, Wash., on Whidbey Island.
A harbor seal pup appears to yawn Sunday, July 20, 2014 on the shore of Puget Sound near Clinton, Wash., on Whidbey Island.   (AP Photo/Ted S. Warren)
« Prev« Prev | Next »Next » Slideshow
My TakeCLICK BELOW TO VOTE
2%
72%
6%
6%
1%
12%
To report an error on this story, notify our editors.

NEWS FROM OUR PARTNERS
Other Sites We Like:   The Street   |   MSN Living   |   PopSugar Tech   |   RealClear   |   24/7 Wall St.   |   Biography   |   Barstool Sports   |   OK!