Plague: A natural history of Yersinia pestis

Abstract

Yersinia pestis is the aetiological agent of plague, a disease that has a place in history as one the major causes of death from the 14th to the 17th Centuries1. It is estimated that, during the Black Death pandemic, approximately 30% of the population of Europe died of plague, and so great in number were the corpses that, in many parts of Europe, the dead were placed in burial pits rather than receiving individual burials. Y. pestis has also been responsible for two other pandemics of disease. The first of these, the Justinian plague, occurred during the 1st Century. The third pandemic occurred during the latter part of the 19th Century and was confined mainly to South-East Asia1. Even today, several thousand cases of plague are reported to the World Health Organization each year, mainly from South-East Asia, the southwestern parts of the USA, Madagascar and Africa.