The Black Death was the worst plague because over 25,000,000 people died. It came from Asia and ended in Europe. Fleas got it from rats which spread it.
In the black death you had bubbles that popped out black stuff(that is where the black death got its name). Their was less labor so they had to get more people. The symptoms where bubbles.
Credits:
Created with images by MichaelGaida - "cemetery grave tombstone" • Matt From London - "Flea" • Meditations - "animal attractive beautiful"