The aim of this article is to audit the distribution and frequency of sexually transmitted infections (STIs) within a sexual network centred in South Wales. After diagnosis of a new case of HIV in February 2007, partner notification, HIV and STI testing were undertaken. Those traced were given information regarding safe sex practices and informed they had been in contact with HIV. Genitourinary (GU) medicine case-notes of contacts identified in the network were reviewed from February 2007 to 1 July 2008. Frequency and distribution of new diagnoses of STIs made on original identification in the network in 2007 were compared with subsequent new diagnoses within the network. One hundred and eighteen men who have sex with men (MSMs) and five women were identified in the original network in 2007. By 1 July 2008, 65 new sexual contacts (all MSMs) were added to the network and there were 25 new STI diagnoses in 13 contacts. Seven contacts originally identified in the cluster in 2007 were diagnosed with 16 of the new STIs. In conclusion, the sexual network has evolved by increasing in size with multiple new STIs diagnosed. The highest risk of STIs occurred in relatively few individuals. Standard interventions in health promotion in the GU medicine setting were not universally successful in preventing high-risk behaviour.
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