CONCORD, N.H. (AP) — A federal prosecutor said Tuesday he expects to bring more charges against a traveling medical technician accused of infecting 30 patients with hepatitis C in New Hampshire, and health officials said they are casting a wider net as they look for more victims.

In his first court appearance on two drug charges, David Kwiatkowski briefly answered a judge’s questions, agreeing that there is enough evidence to keep him incarcerated while the case goes to a grand jury. Afterward, U.S. Attorney John Kacavas said more charges are likely, possibly one for each infected patient.