Dr. Eilish Cleary says it appears the individual with HIV had homosexual partners, but health officials are working with the dating website to identify people at risk.

The number of people having unprotected sex with multiple anonymous partners they meet on dating websites is on the rise in New Brunswick, says the province's chief medical officer of health.

Dr. Eilish Cleary is urging people who have anonymous sex to be tested for sexually transmitted infections after someone with numerous partners recently tested positive for HIV.

The individual was a frequent user of a dating website that facilitates anonymous sexual encounters and had about two dozen sexual partners living in New Brunswick, Cleary said.

HIV, human immunodeficiency virus, causes AIDS, acquired immune deficiency syndrome.

At this point, it appears it was mostly homosexual men involved, said Cleary.

Provincial officials are working with the website, called Manhunt, to identify people who may be at risk, she said.

"Having unprotected sex, especially with someone whose sexual history you do not know, can put your health at risk," Cleary said.

Sexually transmitted infections can cause infertility, increased risk of cancer and other serious illnesses.

They are caused by micro-organisms transmitted by sexual contact or contact with blood or body fluids.

"If you have sex with someone whose sexual history you do not know, it is very important to use a condom," Cleary said.

Sexually transmitted infections are mainly contracted by having oral, vaginal or anal sex with someone who has one.

Some can also be transmitted by accidental needle injury and by sharing contaminated needles and syringes or other equipment for drug use.