how did the bubonic plague end
Bubonic plague is one of three types of bacterial infection caused by Yersinia pestis. Three to seven days after exposure to the bacteria flu like symptoms develop. This includes fever, headaches, and vomiting. Swollen and painful lymph nodes occur in the area closest to where the bacteria entered the skin.
The black death typically refers to a great pandemic, probably bubonic plague, that swept Asia, then Europe in 1346-49, recurring periodically (though never quite as severely) into the 20th century.