An Arizona resident has just died of the plague — Here's what to know about this disease Beginning of dialog window. Escape will cancel and close the window.

To help with these questions about the plague, CNN spoke with wellness expert Dr. Leana Wen, an emergency physician and clinical associate professor at George Washington University.

Most human cases have occurred in two regions: northern Arizona, northern New Mexico and southern Colorado; and California, southern Oregon and far western Nevada. Plague has also been reported in ...