Based on the Document the two ways that the Black Death spread throughout Europe was by. ~In the fourteenth-central urban sanitation was so primitive as to only encourage it spread. ~Some people fled their cities, some gave way to religious frenzy or stark hedonism. ~Some remained faithful at their posts, hoping for divine protection against the pestilence. ~But none can have emerged from the ordeal unaffected.
The plague came from the fleas on the rats and the rats traveled through ships and merchants ship coming from other countries. Once the rats with the fleas reached a city heavily populated, mass amounts of people died because the disease was contagious. To add to that the cities were extremely dirty and had dead people everywhere.