REPORTED gonorrhoea infections have risen in Tasmania this year, but state totals still compare well with the rest of Australia.
According to a national report released at the Australian Sexual Health Conference today, levels of gonorrhoea increased to 13,649 cases in 2012, while syphilis rose to 1534 cases.
In Tasmania, levels of gonorrhoea have risen to 53 infections this year - already exceeding annual totals for each of the past 10 years.
There were 35 cases last year.
Public and Environmental Health Service senior medical adviser Mark Veitch said there were no other significant increases in sexually transmitted infections, with 15 cases of syphilis this year.
``The number of cases of gonorrhoea has recently increased in Tasmania, but the rate per capita in Tasmania remains by far the lowest in Australia,'' Dr Veitch said.
He said chlamydia remained the most common STI in Tasmania, but levels were fairly stable, with 1788 reported cases in 2012.
According to other research released at the sexual health conference, chlamydia has affected teenagers as young as 12.
The Burnet Institute institute study found that 13 per cent of females with the STI were between 12 to 15 years old, while 12 per cent were aged 16 to 19.
Among males, 15 per cent were in the 16 to 19 year age group, while nine per cent were 12 to 15 years and 13 per cent were 20 to 24.
Kirby Institute professor David Wilson said the figures were just the tip of the iceberg, estimating that as many as one in 20 Australians between 15 and 24 had chlamydia.
``It is likely that there are five times as many Australians with chlamydia that is undiagnosed, who may be at increased risk of infertility and other reproductive problems,'' Professor Wilson said.