How did the Black death came to an end?

Well, the plague itself didn't just go away, in fact it's still very much around and there's about 20 cases a year in the U. S. but the as for the pandemic in Europe from 1346-1353 there's no real answer on how it ended, there's plenty of theories and one of the major ones being simply that they all quarantined much like we are now which greatly decreased the number of cases.