A sharp rise in HIV cases in recent months has prompted calls for the wider introduction of free, rapid testing for the disease.
The number of HIV diagnoses was the same as for the first half of 2014 in the first half this year, but has soared since, the Oireachtas health committee has been told.
Provisional figures indicate 427 new diagnoses for this year up to the end of November – up 85 over the same period last year, the meeting held to mark World Aids Day on December 1st has heard.
Niall Mulligan, chief executive of HIV Ireland, said some of the increase was due to increased testing, but it was still estimated that 30 per cent of people living with HIV did not know they had the virus.
More than 7,000 people have been diagnosed with HIV here since the 1990s, and about 3,500 are currently living with the disease, according to Mr Mulligan. Men who have sex with men accounted for half of all cases last year.