Minor changes turned Black Death germ from mild to murderous

Minor changes turned Black Death germ from mild to murderous

The bacterium Yersinia pestis has inflicted almost unimaginable misery upon humankind over the centuries, killing an estimated 200 million or more people and triggering horrific plagues in the 6th and 14th centuries. But this germ was not always particularly dangerous. Scientists said on Tuesday minor genetic changes that it underwent many centuries ago – adding […]