Plague is often linked to medieval Europe, crowded cities, and rats carrying infected fleas. However, a new study published in the journal Nature shows that the disease was already killing people thousands of years earlier. Researchers have discovered that plague caused deadly outbreaks among hunter-gatherers in Siberia about 5,500 years ago, long before cities and […] The post Ancient plague was already deadly 5,500 years ago, study reveals appeared first on Knowridge Science Report .