Around 5,200 years ago, plague was not just present but common in six generations of one Swedish family, according to a new study. The researchers analyzed both the ancient DNA of these people’s skeletal remains and the pathogens that left traces in them. Around 5,200 years ago, plague was not just present but common in six generations of one Swedish family, according to a new study. The researchers analyzed both the ancient DNA of these people’s skeletal remains and the pathogens that left traces in them. Archaeology Phys.org – latest science and technology news stories