"Modeling plague transmission in Medieval European cities" Topic

"The Black Death pandemic swept through Europe during the Middle Ages leading to high mortality from plague, caused by the bacterium Yersinia pestis. How it spread, the transmission of the disease within and between cities, remains a subject of controversy among scientists and historians.

Prior to the identification of the bacterium in medieval tooth samples, the nature of the pandemic led to speculation that the Black Death was not the same disease as current-day plague. In the classical mode of transmission to humans, black rats act as an intermediate host and the disease spreads by infected rat fleas. But in the case of Black Death, alternate modes have been proposed in which the disease spreads either through pneumonic transmission of plague or through an intermediate human ectoparasite vector, such as the human body louse.

To understand the transmission dynamics within cities, we used a spatial metapopulation model with SIR-dynamics for three transmission scenarios and compared how the epidemic curve, epidemic duration, and total mortality differ between each mode and historical data. Here we show that 1) a model of louse-borne transmission of bubonic plague fits the pattern of plague transmission within cities during the Black Death with regards to epidemic duration and the distribution of deaths during an epidemic, and that 2) primary pneumonic plague can produce large scale epidemics, but only under conditions highly favorable for this mode of transmission…."
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