Gonorrhoea Notifications Research Articles

Could sexually transmissible infections be contributing to the increase in HIV infections among men who have sex with men in Australia?

To review existing data on sexually transmissible infections (STI) in men who have sex with men in Australia in order to determine the possible contribution of STI to diverging trends in HIV notifications in different states. We reviewed data from multiple sources, including routine national surveillance data, laboratory surveillance data, self-reported information on STI testing in men who have sex with men and ad hoc reports of STI prevalence. We found increasing rates of gonorrhoea and infectious syphilis notifications in urban men in Australia between 1997 and 2006, and increasing rates of chlamydia notifications in men aged 30-49 years. There was little difference in these trends by state. Differences in the population groups sampled meant we were unable to gain further information on trends in men who have sex with men from these studies. Data on STI testing showed an increase in anal STI testing between 2003 and 2006, which may have increased the number of diagnoses of chlamydia and gonorrhoea for men who have sex with men during this period. Over the past 10 years, there has been a substantial increase in diagnoses of gonorrhoea and infectious syphilis, and probably chlamydia, in men who have sex with men in Australia. However, it is unlikely that changes in the pattern of STI transmission are responsible for the recent divergence in HIV rates between Australian states because there is little evidence that trends in STI also differ by state.

31. WHY HAS TRICHOMONAS VAGINALIS DECLINED DRAMATICALLY AMONG VICTORIAN WOMEN (1947-2005)?

Trichomonas vaginalis (TV) diagnosis rates have decreased considerably in some countries during the last two decades. It is unclear why TV has decreased only in some countries. This study investigated the relationships between: 1) TV diagnosis rates among women attending the Melbourne Sexual Health Centre (MSHC), and among Pap smears screened by Victorian Cytology Services (VCS); 2) the use of nitroimidazoles in Australia and; 3) gonorrhoea notification data for Victoria to assess changes in sexual behaviour. TV diagnosis rates among women attending MSHC rose from under 5% in the 1940's, to 20% to 30% in the 1960's and then declined 5% to 10% during the 1970's. From 1980 onwards, TV diagnosis rates fell progressively to below 1% by 1991, with 0.1% in 2004. A similar pattern was seen in TV at VCS, but with lower absolute percentages. Metronidazole was introduced into Australia in 1961 and tinidazole in 1976 and by 1987 there were 400 000 nitroimidazole prescriptions per year. Pap smear screening in Victoria began in 1965, only including 20% of women per year (aged 15 to 69) by the mid 1980's. Post 1980's, screening rose until 2000, stabilising at 35% of women per year. Gonorrhoea notification rates peaked during times TV was experiencing its greatest falls. The initial decline of TV seen in Victoria was associated with the introduction of effective antibiotics. The further decline to less than 1% was seen when Pap smear screening participation increased during the 1990's.