SEELEY — Three inmates at Centinela State Prison have been released from quarantine this week following their exposure to the H1N1 virus, a spokesman said Thursday.

The Level 4 inmates kept in quarantine for seven days from Feb. 1 through Wednesday and returned to their “regular programming,” said Administrative Lt. Jesse Jackson.

An Imperial County Public Health official confirmed that the inmates at Facility C had been infected with the virus more commonly known as the swine flu, Jackson said. The programming that the inmates resumed included taking classes and partaking in work programs, Jackson said.

No other H1N1 cases have been reported at the prison since last week, Jackson said.

State officials believe that the inmates may have been exposed to the virus by a staff member or visitor who could’ve been infected, said Nancy Kincaid, spokeswoman for the California Department of Corrections and Rehabilitation.

In a separate and unrelated matter, an autopsy is set Tuesday for a 72-year-old inmate who was found early Wednesday unresponsive in his cell, coroner’s officials said.

The inmate was identified by Imperial County Coroner’s Sgt. Thomas Garcia as Glen Miller.