BMJ 1996;312:539-542 (2 March)

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Continuing transmission of sexually transmitted diseases among patients infected with HIV-1 attending genitourinary medicine clinics in England and Wales

M A Catchpole, consultant epidemiologist,a D E Mercey, consultant physician,b A Nicoll, consultant epidemiologist,a P A Rogers, statistician,a I Simms, clinical scientist,a J Newham, medical laboratory scientific officer,c A Mahoney, medical laboratory scientific officer,c J V Parry, clinical scientist,c C Joyce, clinical scientist O N Gill, deputy director C Joyce, clinical scientist O N Gill, deputy director,a  O N Gill on behalf of the Collaborative Group

a Public Health Laboratory Service, Communicable Disease Surveillance Centre, London NW9 5EQ, b Academic Department of Genitourinary Medicine, Mortimer Market Centre, London WC 6AY, c Public Health Laboratory Service, Virus Reference Division, London NW9 5HT

Correspondence to: Dr Catchpole.

Abstract

Objective: To determine whether those who are aware of being infected with HIV continue to adopt behaviours that place others at risk of HIV infection.
Design: Ongoing survey of current diagnosis of sexually transmitted disease and awareness of HIV infection among patients attending genitourinary medicine clinics.
Setting: Six genitourinary medicine clinics in England and Wales (two in London and four outside) participating in unlinked anonymous HIV serosurveillance during 1990-3.
Subjects: All attenders having blood drawn for syphilis serology for the first time during the calendar quarter of attendance.
Main outcome measures: The proportion of syphilis serology specimens with antibody to HIV-1 detected by unlinked anonymous testing of the residue. The proportion of attenders infected with HIV-1 who remained clinically undetected, and the proportion who had another recently acquired sexually transmitted disease.
Results: Of 85441 specimens tested, 2328 (2.7%) were positive for antibodies to HIV-1. About 30% of these specimens were from attenders whose HIV-1 infection remained clinically undetected. HIV-1 infection was found to coexist with another recently acquired sexually transmitted disease in 651 attenders, of whom 522 were homosexual or bisexual men. Of these, 245 (47%) already knew themselves to be infected with HIV-1. This proportion increased between 1990 and 1993.
Conclusions: A considerable proportion of patients infected with HIV-1 are not identified by voluntary confidential HIV testing in genitourinary medicine clinics. Substantial numbers of homosexual or bisexual men attending genitourinary medicine clinics continue to practise unsafe sex despite being aware of their infection with HIV-1.

Key messages

  • Key messages

  • The proportion of infections with HIV-1 among homosexual and bisexual men and heterosexual women that remained undetected at the end of a clinic episode fell between 1990 and 1993

  • The coexistence of HIV-1 infection and recently acquired sexually transmitted disease provides evidence of continuing unsafe sexual behaviour among homosexual and bisexual men infected with HIV-1 and attending a genitourinary clinic up to the end of 1993

  • The results indicate that those who know they are infected with HIV often do not adopt safer sexual practices, which raises questions about the effectiveness of counselling after tests and the potential benefits of policies designed to encourage HIV testing


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