The bacteria, C. difficile, is typically found in hospitals, but a study out Wednesday reports a substantial number of people contracted the bug who hadn't been in a hospital, but had recently visited the doctor or dentist.

The bacteria can cause deadly diarrhea, according to the CDC, with infections on the rise. The new report shows nearly half a million Americans infected in various locations in one year, with 15,000 deaths directly attributed to C. diff.

In a 2013 study, researchers found C. diff present in six out of seven outpatient clinics tested in Ohio, including on patients' chairs and examining tables.

The CDC is so concerned that they're starting a new study to try to assess nationally whether people are getting C. diff in doctors' offices.