FILE - This Monday, Aug. 6, 2012 file photo shows the Exeter Hospital in Exeter, N.H. David Kwiatkowski, who worked in the hospital's cardiac catheterization laboratory, has been charged with causing an outbreak of hepatitis C, infecting more than 30 people. Records and interviews conducted by The Associated Press show that authorities could have halted Kwiatkowski's career four years ago, after he was fired from a Pittsburgh hospital. But he went on to work at 10 more hospitals, none of which knew about his history. Kwiatkowski has pleaded not guilty. (AP Photo/Jim Cole, File)

Associated Press
FILE - This Monday, Aug. 6, 2012 file photo shows the Exeter Hospital in Exeter, N.H. David Kwiatkowski, who worked in the hospital's cardiac catheterization laboratory, has been charged with causing an outbreak of hepatitis C, infecting more than 30 people. Records and interviews conducted by The Associated Press show that authorities could have halted Kwiatkowski's career four years ago, after he was fired from a Pittsburgh hospital. But he went on to work at 10 more hospitals, none of which knew about his history. Kwiatkowski has pleaded not guilty. (AP Photo/Jim Cole, File)
FILE - This Monday, Aug. 6, 2012 file photo shows the Exeter Hospital in Exeter, N.H. David Kwiatkowski, who worked in the hospital's cardiac catheterization laboratory, has been charged with causing an outbreak of hepatitis C, infecting more than 30 people. Records and interviews conducted by The Associated Press show that authorities could have halted Kwiatkowski's career four years ago, after he was fired from a Pittsburgh hospital. But he went on to work at 10 more hospitals, none of which knew about his history. Kwiatkowski has pleaded not guilty. (AP Photo/Jim Cole, File)
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