Pestilence

Up to 600 Michigan residents may have been exposed to tuberculosis - UPI.com
UPI reports: "Michigan's health department said it's investigating three facilities and warning residents they may have been exposed to tuberculosis through a clinic worker. The Michigan Department of Health and Human Services did not identify the worker, but said they may have come in contact with as many as 600 people between last May and the end of January. [...] Tuberculosis is a potentially serious condition that can be spread to others through the air. The bacteria usually grows in the lungs but can attack any part of the body."

Comment: That sounds like a situation that could easily get out of control.