EXETER, N.H. — A traveling medical technician accused of causing a hepatitis C outbreak in New Hampshire had been fired by hospitals in Pennsylvania and Arizona, hospital officials said. David Kwiatkwoski was found inside an area of a Pittsburgh hospital where he was not assigned in 2008 and fired, a statement from UPMC Presbyterian said. He had worked there for 47 days.

“We are working closely with the Allegheny County Health Department and the Pennsylvania Department of Health to identify patients who may have come into contact with Mr. Kwiatkowski and determine if they may have been at risk for contracting Hepatitis C,” the statement said. The CEO at an Arizona hospital where Kwiatkwoski worked has also said he was fired after testing positive for cocaine and marijuana. He had also worked in Georgia, Kansas, Maryland, Michigan, New York, in addition to Pennsylvania, before being hired by Exeter Hospital in New Hampshire in 2011.

Kwiatkwoski is being held on federal drug charges in New Hampshire, and authorities are trying to determine whether he spread the virus elsewhere.