Pottery shards, hieroglyphics, and cave art stand as testaments to the restless movements of long-vanished civilizations. So do viruses lodged in the bones of mummies. Two Japanese researchers--epidemiologist Kazuo Tajima and virologist Shunro Sonoda have spent the last decade analyzing the peopling of ancient South America by following the trail of a virus called HTLV-1. The virus, which triggers leukemia in three percent of its carriers, spreads only by direct human contact, so its movements parallel the progress of infected people.
DNA extracted from Andean mummies reveals that viruses from Asia reached the Americas long before the Hong Kong flu.
Courtesy: Kazuo Tajima
Isolated groups in Chile harbor HTLV-1, and Tajima's analysis shows that the virus apparently hitched a ride to South America in the blood of Asian immigrants who crossed the Bering Strait and wandered south 12,000 to 25,000 years ago. After examining 104 mummies in northern Chile, Tajima ...
