
Diseases started jumping from animals to humans at least 6,500 years ago, researchers found in a new study of ancient DNA.
After analyzing ancient DNA from 1,313 prehistoric humans from Europe and Asia, researchers charted a map and timeline of human infectious disease that spans 37,000 years. Within that long history, they uncovered the earliest-known evidence of zoonotic disease — in which pathogens in animals transfer to humans — dated to 6,500 years ago.