Humans were dying of anthrax in North America much earlier than thought—perhaps after scavenging the remains of infected animals while migrating from Asia during the Ice Age—a new study says.

"We've always thought that anthrax was an Old World disease that was brought to the New World by Europeans" around 1500, said study coauthor Paul Keim of Northern Arizona University.

But the new report suggests that ancient humans entering the continent thousands of years earlier imported the disease after crossing the Bering land bridge, which once connected present-day Alaska and eastern Siberia.

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