Health officials said a medical technician accused of infecting patients in New Hampshire with hepatitis C worked two temporary assignments in Pennsylvania.
The state Department of Health said David Kwiatkowski had brief assignments at University of Pittsburgh Medical Center Presbyterian in 2008 and Temple University Hospital in 2010.
Pennsylvania health officials are working to identify patients who may have been exposed at those hospitals. Temple University Hospital said he may have contracted hepatitis C after his time there.
Authorities in New Hampshire said Kwiatkowski injected himself with anesthetic drugs stolen from a lab at Exeter Hospital, contaminating syringes later used on patients. Thirty patients have been diagnosed with the strain of hepatitis C that Kwiatkowski carries.
Health officials in Michigan, Maryland, Kansas and New York say he also worked in their states.
UPMC patients who underwent procedures that may have involved Kwiatkowski will be contacted and encouraged to get tested for the blood-borne disease.