Kwiatkowski, whom prosecutors describe as a "serial infector," was recently indicted on multiple charges of tampering with a consumer product and illegally obtaining drugs. He pleaded not guilty in federal court on Monday.
Until May, Kwiatkowski worked at Exeter Hospital, where 32 patients were diagnosed with the same strain of hepatitis C he carries. Before that, he worked as a traveling technologist in 18 hospitals in seven states, moving from job to job despite having been fired twice over allegations of drug use and theft.
Thousands of patients in Arizona, Georgia, Kansas, Maryland, Michigan, New York and Pennsylvania have since been tested for hepatitis C, a blood-borne viral infection that can cause liver disease and chronic health issues. In addition to the New Hampshire patients, a handful of patients in Kansas and one in Maryland have been found to carry the strain Kwiatkowski carries.