A Missouri man could face a life sentence after admitting to having unprotected sex with up to 300 men without disclosing he was HIV positive.
The case has triggered health alarms and people who have had anonymous sex are now being urged to get health checks, ABC News reports.
David Lee Mangum, 36, was arrested on charges of "reckless exposure to HIV" on August 27 after his former gay live-in lover, known as D.B, 28, made a complaint to Dexter police.
D.B "specifically asked if (Mangum) had any disease and Mangum replied no," a criminal complaint document obtained by CNN alleges.
The couple, who had lived together in Dexter since October 2012, separated in July when D.B. discovered his partner was cheating on him.
D.B was then tipped off by Magnum’s former female housemate that he had been HIV positive since 2003, and a subsequent health check realised his fears that he too was HIV positive.
Of his hundreds of partners, he had unprotected sex with at least 20, some of which comprised of a third man who was tied up, according to the criminal complaint.
Authorities have tracked down some of Mangum's sexual partners, but "countless others remain unknown," Stoddard County prosecuting attorney Russell Oliver said in a statement.
"Due to the initial exposure containing 300 or more individuals over an extended period of time, each of which could themselves have multiple sexual partners, this situation should be a serious concern."
"Any individual who may have come into contact with this man, or through Craigslist, if you met a man in Stoddard County and engaged in sex, we'd urge you to get tested and cease all sexual activity,” the statement said.
The accused may not be helpful to the investigation as he "usually only knew his partners’ first names", Missouri police Detective Cory Mills said.
But at least two more complaints have been filed in recent days, he said.
Knowingly exposing someone to HIV without consent can bring a 15-year prison term under Missouri law, while infecting them can carry a life sentence.
Mangum's bail was set at $250,000 Thursday in Stoddard County and his preliminary hearing will be on September 26.