Conversation so far:
where did the bubonic plague spread in europe
In mere months, the Black Plague spread throughout all Italy, through half of Spain and France, down the coast of Dalmatia on the Adriatic, and north into Germany.
how many people in europe died because of the black plague
A rough estimate is that 25 million people in Europe died from plague during the Black Death.
how many total deaths resulted from the black death
The bubonic plague was the cause of the Black Death that swept through Asia, Europe, and Africa in the 14th century and killed an estimated 50 million people.

Question: how did the plague spread
Self-contained rewrite: how did the bubonic plague spread