A Mysterious Disease Is Killing People in Wisconsin

Since November, 54 people in Wisconsin have one by one fallen ill with an obscure kind of bacteria called Elizabethkingia. Fifteen have died from the infection.

It’s a mystery for the CDC’s disease detectives, a corps of about 70 doctors and epidemiologists who specialize in tracing outbreaks, from foodborne illnesses to Ebola.

At this point, CDC is still investigating water—though other sources like water used on produce, which requires tracing it back to grocery stores or farms.