Yes. The unsanitary conditions of the cities drew rats to populated areas. The rats were carrying fleas infected with the disease, and those fleas infected to human population. The people were also suffering from weakened immune systems due to the unsanitary conditions and malnutrition (due to food shortages) which made them more susceptible to the plague.
no
Be good. Try to avoid being bad and no plague will come to you.
Twas bad.
they were cold and the water and sanitation was bad
Anything would be great
Death
They had to deal with the plague, and bad water, as well as civil difficulty.
Real real real bad!
Sometimes. It depended on how bad their illness was
It is literally an epidemic plague!
It is thought of the black death (bubonic plague, black plague, etc.) starting in 1347 and ended in 1349. It began in the Gobi desert, was passed on from the mongols to Italian fishers who brought it to Italy, sewer system was very bad, rats walked over the cities spreading even more the disease making it an epidemic.
Romans weren't very good at keeping a good hygiene level, so bad hygiene = plague.