What is plague? How many people died from the Black Death and the other plague pandemics? Learn about the bacterium behind the plague disease, how factors like trade and urbanization caused it to spread to every continent except Antarctica, and how three devastating pandemics helped shape modern medicine.
About 37 million people around the world are currently living with AIDS. Learn how the human immunodeficiency virus (HIV) causes AIDS, where HIV may have originated, and how AIDS has become one of the worst pandemics in modern history.