( CNN ) -- Prosecutors in rural Missouri have charged a man with exposing his partner to HIV and say he may have exposed more than 300 other people to the virus that causes AIDS . David Mangum told police he had at least that many unprotected sexual encounters with people he met online or in parks since he was diagnosed with HIV in 2003 , Dexter , Missouri , detective Sgt . Corey Mills told CNN . Mills said it will be difficult to find and warn those people , since Mangum `` usually only knew his partners ' first names . '' Mangum was arrested after his former partner told police that Mangum had lied to him about his status , a police affidavit states . He was arraigned Thursday morning in Stoddard County , about 160 miles south of St. Louis , with bail set at $ 250,000 . The former partner has tested positive for HIV , according to police . Mangum , 36 , told police that between 50 and 60 of his partners lived in Stoddard County , according to court records . Knowingly exposing someone to HIV without their consent is a felony under Missouri law that can bring prison terms up to 15 years . Infecting someone can bring a life term .
David Mangum told police he has been HIV-positive since 2003 . Since then , he had 300-plus unprotected sexual encounters , he told investigators . He said the sex was consensual, but that it did not feel good because of his HIV status.