Some europeans believed that the was sent by god to punish them for their sins.
crimean cholera
black death
justinian plague
spanish flu

Some Europeans believed that the Black Death was sent by God to punish them for their sins. The Black Death resulted to deaths of an estimate of 75 to 200 million people in 1346-1353. It was a plague that was caused by rat fleas that live on black rats that were regular passengers of merchant ships that came from Central Asia and made its way to the Mediterranean and Europe.  The plague affected religious, social, and economic ways of the Europeans. 

The answer is the Black Death.  It was a plagued caused by fleas that were carried by rats that spread throughout medieval Europe. Many fell victim to this plague as it spread throughout the continent.  Symptoms such as coughing, fever and dark boils were on the victims of the plague.

answer; biological;