Bubonic Plague, the bacterial infection that killed tens of millions of Europeans in the 14th century, is still around today. Also known as “the Black Death,” the disease claimed the lives of more than 100 million people throughout the Byzantine empire back in the 6th century. Today, the disease exists primarily in wildlife such as squirrels, chipmunks, mice and feral cats, but it can also cross over to humans from animal bites and infected fleas.
