LONDON (Reuters) - Plague, the disease that devastated medieval Europe, is re-emerging worldwide and poses a growing but overlooked threat, researchers warned on Tuesday. While it has only killed some 100 to 200 people annually over the past 20 years, plague has appeared in new countries in recent decades and is now shifting into Africa, Michael Begon, an ecologist at the University of Liverpool and colleagues said.
A bacterium known as Yersinia pestis causes bubonic plague, known in medieval times as the Black Death when it was spread by infected fleas, and the more dangerous pneumonic plague, spread from one person to another through coughing or sneezing.
"Although the number of human cases of plague is relatively low, it would be a mistake to overlook its threat to humanity, because of the disease's inherent communicability, rapid spread, rapid clinical course, and high mortality if left ...