Dr. William Schaffner chairs Vanderbilt's Department of Preventive Medicine. He has been following the investigation into the cause of the infection since it was first detected in a patient at the university's hospital about two weeks ago.
Thus far, 13 cases of the illness have been discovered in patients who received steroid injections for back pain at a Nashville clinic. Two of those patients have died. One other case has been detected at a North Carolina clinic in a patient who received the same type of injection.
Schaffner said he believes part of the reason for the Nashville cluster is early detection.