Kiwi researchers are close to revealing how many people are undiagnosed with HIV after a sweep of gay clubs for saliva samples.
It is thought that many infected people are unaware of their illness and aren't getting tested - and HIV diagnosis rates among gay men are increasing worldwide.
Researchers took mouth fluid swabs from 1000 anonymous gay and bisexual men at Auckland gay venues in February and results are due out in the next two months.
In the US, about 25 per cent of infected gay or bisexual men don't know they have HIV; in the UK that rate is 30 to 40 per cent and in Australia about 30 per cent.
Hans Versluys, 53, was swabbed at Auckland's Centurian sauna as part of the study and said the research was a positive move.