Just how deadly was the Black Death

Flagellant movement:
With no understanding of the biology of the disease, many people believed that the Black Death was a kind of divine punishment. 

The Black Death arrives in France:
The crowded port provided perfect conditions for further transmission. The Black Death migrated exponentially across France and remained in the country until 1352.

Spread to Italy:
Later in 1347, another vessel arrived in Sicily, the crew barely alive. The disease spread rapidly all over the island.

Human ectoparasites, like body lice and human fleas, according to a recent study published by the Proceedings of the National Academy of Sciences .

Origin of the Black Death:
It made its definitive appearance in Crimea in 1347, brought there by rats traveling across the Black Sea on Genoese merchant ships.

Black rat:
The PNAS report counters conventional wisdom that suggests black rats and their fleas were responsible for the transmission of the disease. 

From Crimea, One ship arrived in Constantinople, where over 90% of the city's population would eventually succumb to the plague.

Deaths in Austria:
The plague had reached Vienna in May 1349. By the end of the year, it had killed about one third of the population.

Germany infected:
The plague arrived in southern Germany from Switzerland in the summer of 1349. By autumn, much of the country was infected. 

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