A 31-year-old female English teacher at Trabuco Hills High School has been arrested on suspicion of having sex with one of her male students.

Alyssa Ann Johnson, 31, was arrested Thanksgiving night at her Tustin home, sheriff’s spokesman Jim Amormino said.

Deputies began investigating the allegation after a student at Trabuco confided in someone at the school that he had had sex with Johnson.

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Authorities declined to give the boy’s age but said he is 14 to 18 years old and alleges that the encounter happened over the summer, Amormino said.

Johnson has taught at Trabuco for the past four years.

• Johnson posted $50,000 bail and was released from Orange County Jail.