Geographical position of the five archaeological sites investigated. Green dots indicate the sites. Also indicated are two likely independent infection routes (black and red dotted arrows) for the spread of the Black Death (1347-1353) after Benedictow. ©: PLoS Pathogens The 'Black Death' was caused by at least two previously unknown types of Yersinia pestis bacteria. The latest tests conducted by anthropologists at the Johannes Gutenberg University Mainz (JGU) have proven that the bacteria Yersinia pestis was indeed the causative agent behind the "Black Death" that raged across Europe in the Middle Ages. The cause of the epidemic has always remained...