New report: Surveillance of STIs and Blood-Borne Viruses in South Australia, 2018

Communicable Disease Control Branch, SA Health, July 2019

In 2018, there were 8,556 new notifications of STI and BBV in South Australia. This represents a 3% increase in the number of new notifications compared to notifications received in 2017.

In 2018, there were 6,256 notifications of Chlamydia trachomatis (chlamydia) making this the most commonly notified STI in South Australia. The demographics of people diagnosed with chlamydia have remained relatively stable over the past five
years.

There were no notifications of donovanosis in 2018.

There were 1,288 notifications of gonorrhoea in 2018. The notification rate of gonorrhoea increased from 45 per 100,000 population in 2014 to 74 per 100,000 population in 2017 and 2018. The rate in the Aboriginal population was 813 per 100,000 population in 2018 compared to 55 per 100,000 population in the non-Indigenous population.

There were 203 notifications of infectious syphilis in 2018, the highest number of annual notifications in the past 10 years. The notification rate of infectious syphilis in 2018 was 11.7 per 100,000 population, more than double the rate in 2016 of 5.2 per 100,000 population. In 2018, 88% of notifications were in males, the majority being among men who have sex with men (MSM) (75%). Infectious syphilis remains high in the Aboriginal population. There were no notifications of congenital syphilis in 2018.

There were 39 new diagnoses of human immunodeficiency virus (HIV) infection in 2018. Thirty-two of the 39 notifications were in males (82%). In 2018, 63% of male cases reported male-to-male sex. Six females acquired their infection overseas and one in South Australia.

There were four notifications of newly acquired hepatitis B infection in 2018, below the five year average (2013-2017) of eight cases per year. There were no notifications in the Aboriginal population. There were 254 notifications of unspecified hepatitis B infection reported in 2018, a decrease compared to the five year average (2013-2017) of 325 cases per year. The notification rate has declined in the Aboriginal population over the past five years.

There were 41 notifications of newly acquired hepatitis C in 2018. Sixty-one per cent of cases were males, and 66% were aged 30 years and over. The notification rate of unspecified hepatitis C infection was 22.2 per 100,000 population in 2018, with a
total of 385 notifications in 2018 compared to 465 in 2017.

There were five new diagnoses of hepatitis D infection in 2018, below the five year average (2013-2017) of 9.8 cases per year.

 

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