The plagues came in three forms, bubonic, pneumonic, and septicemic
In his Decameron, the author Giovanni Boccaccio described the isolation of ten young patricians in a palazzo to avoid contact with people in plague-stricken Florence. They kept themselves entertained by telling stories as written in the Decameron. Segregation worked for them and for the area of present-day Poland which was spared the plague because a quarantine was imposed. Quarantine was isolation for forty days.
Pope Clement VI isolated himself at Avignon, France. He sat for weeks in summertime between two large fires constantly stoked. It worked because fire and heat repelled the fleas.
An English nobleman ordered the nearby village to be burned to the ground. No fleas, rats, or disease reached his castle, and his property was safe. It seemed that overpopulation and overcrowding in unsanitary conditions contributed to the spread of the plagues.
The plagues came in three forms, bubonic, pneumonic, and septicemic.
The bubonic variety appeared as swollen lymph nodes called buboes or boils in the armpits, groin, or the site of the flea bite.
The pneumonic variety infected the lungs, causing coughing and spitting of blood.
The deadliest was the septicemic plague where the bloodstream was invaded by bacteria and death occurred within hours.
Not everybody died of the plague. Many improved and their recovery was considered a miracle. Doctors prescribed bleeding, laxatives, enemas, burning of the buboes (sometimes it worked), aromatic woods burned to purify the air, rosewater and vinegar sprinkled on floors, special diets, and other strange concoctions.
The Black Death encompassed most of present-day Europe, all the way to Russia and the Black Sea, Constantinople, and Greece.