BALLSTON SPA — A Wilton woman who repeatedly raped a child whom she had taught as a school teacher was sentenced Wednesday to 15 years in state prison for her guilty plea to a rape charge.

Elizabeth M. Barthelmas, 49, of Plum Court, was sentenced after hearing from the young man whom she repeatedly had sex with when he was under the age of 13. He told her she “betrayed” him and took away part of his youth.

“As a child, you took advantage of my body and my brain. It’s sickening,” he told her.

Saratoga County Assistant District Attorney Jennifer Buckley told Barthelmas that her case “demonstrates that the pain of child sexual abuse is the same regardless whether the victim is a girl or boy.”

Barthelmas met the boy through her duties as a fifth-grade teacher at Dorothy Nolan Elementary School in Wilton in the mid-2000s. The sexual relationship followed in 2007 and 2008, when he was no longer in her class.

Barthelmas pleaded guilty July 3 in Saratoga County Court to first-degree rape, and the plea satisfied other charges that had been filed in connection with other sexual acts with the boy over a period of time.