Bad news: the plague of Justinian and the Black Death 800 years later were independent emergences from rodents into human beings. Rodent species are therefore reservoirs for new lineages of Yersinia pestis moving into human populations.
▻http://cartesianproduct.wordpress.com/2014/02/01/the-bad-news-about-the-black-death
#bacteriology #plague #pandemic #history
