A man accused of infecting his boyfriend with HIV has been found guilty.

Mikio Filitonga was on trial at the Auckland District Court for causing grievous bodily harm with reckless disregard, and committing a criminal nuisance by doing an unlawful act.

The Crown said the 37-year-old - knowing he was positive and fully aware of his obligation to disclose his health status - had unprotected sex with his boyfriend from February 2014.

This caused his partner, who has name suppression, to contract HIV.

The defence said the complainant was untrustworthy, he could've got the virus from someone else, and Filitonga told him he was positive before they had intercourse.

After almost seven hours of deliberations, the jury found Filitonga guilty of both charges.

He will be sentenced in May.