A traveling hospital worker accused of stealing drugs and infecting patients with hepatitis C through contaminated syringes faces new federal charges. David Kwiatkowski, whom prosecutors describe as a “serial infector,” was arrested in July and charged with one count each of illegally obtaining drugs and tampering with a consumer product. On Wednesday, a federal grand jury indicted him on 14 charges: seven counts of tampering with a consumer product and seven counts of illegally obtaining drugs. The indictment against Kwiatkowski, who remains in custody, replaces the earlier charges. Until May, Kwiatkowski worked as a cardiac technologist 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.