The hepatitis C 'positive' health worker is now linked to St. John Hospital and Medical Center in Detroit.
The hospital says it's collaborating with the Michigan Department of Community Health in the investigation.
David Kwitakowski is under arrest in New Hampshire. He's accused of infecting dozens of patients with the hepatitis C virus.
At least 30 people have been diagnosed with hepatitis C.
Prosecutors say Kwitakoski stole syringes with narcotics and used them. He then refilled them with saline and they were used on unsuspecting patients.
Kwitakowsi worked in several states including Michigan.
St. John hospital issued a press release saying he worked in the radiology department from July 2005 to September 2005.
As a precaution, the hospital will contact radiology patients who received narcotics by injection.