An HIV-positive Ohio man accused of sexually assaulting three girls has pleaded not guilty to 19 counts in court, where a prosecutor said one of them, a 12 year old, is pregnant.

Twenty-seven-year-old Keith Anthony Allen of Columbus pleaded not guilty Monday to charges including rape, felonious assault and gross sexual imposition. He remains jailed with no bond, and court records listed no attorney for him.

Allen is accused of raping two 12-year-old girls since September and fondling a third girl. The assault charges allege he raped the girls while knowing he was HIV-positive and had consensual sex with a woman without telling her he has the virus that causes AIDS.

Prosecutors say Allen could face a life sentence if he is convicted of having sex with a child under 13.