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The content crackdowns continue. The surveys have had multiple applications Table 5. They have rapidly detected new problems in defined geographical areas and population sub-groups, and the emergence of HIV in new areas.

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Although such changes have not always reflected increases in local transmission, they have warned of future increase in disease and increased risk of transmission. Endemic homosexual transmission of at least 0. Unlinked anonymous survey data have helped re-focus preventive efforts by providing regular, timely, and accurate information indicating the groups and places most affected by HIV transmission.

Analyses in the early s, including data from the unlinked anonymous programme, indicated that the bulk of HIV transmission was taking place through male homosexual intercourse.

Hence the programmes have produced useful negative data. Different programme data also ensured that IDU remained a priority group for prevention efforts. The direct method of estimating prevalent infections 56 employs HIV prevalences from individual unlinked surveys applied to estimates of the size of source populations, Figure 1 using data from a national survey of sexual behaviours; 57 each major component of the populations at risk is accounted for separately and adjustments made for overlapping risk groups and differential fertility among HIV infected and uninfected women.

The unlinked anonymous surveys monitor key risk behaviours in national samples of the populations at highest risk. The programme's surveys provide information on the proportions of infections that have not been diagnosed prevalent in a range of clinical settings, while additional analysis using reports of diagnosed infections provides estimates of underdiagnosis at a population level.

The finding of a ten- to twenty-fold difference in prevalence in pregnant women between high and low prevalence areas Figure 3 led directly to policies of routinely offering antenatal HIV testing in London, Edinburgh and Dundee. Prevalence ranges derived using the direct method are used to constrain calculation projections of HIV and AIDS incidence, reduce the planning projections and thus narrow confidence intervals Figure 5. An advantage of this approach is that, unlike the indirect methods of estimating prevalence, it is independent of AIDS surveillance and is not prejudiced by recent treatment effects on AIDS reporting.

The voluntary salivary survey of IDU has provided surveillance for current or prior infection with hepatitis B virus. Testing for other pathogens has begun using sera, starting with hepatitis C in surveys of STD clinic attenders, pregnant women, prisoners and IDU. Permission has also recently been given for testing for hepatitis A and B. This work is facilitated by a STD serum archive of HIV positive and negative specimens exploiting the investment for collection and characterization of specimens.

In the late s the pandemic of HIV is changing with rising prevalence in many Commonwealth countries with links to the UK. However reassurance has come from unlinked data since so far HIV has not appeared in unlinked samples from people born in south Asia attending STD clinics, and low prevalence is observed among pregnant women in districts where there are substantial numbers of south Asians.

The collection of positive specimens, as a well characterized probability sample of diagnosed and undiagnosed prevalence infections overcomes the biases associated with diagnostic testing and asking for referral of specimens.

This resource is used for monitoring the epidemiology of HIV-1 sub-types in different risk groups. Estimating incidence from serial prevalence data is difficult and prevalence trends can be misleading. For example, among homosexual and bisexual men downward trends followed the referral of men with diagnosed HIV infections out of the STD clinics to specialist HIV care.

There are limitations to interpretations of unlinked anonymous programme data. There is an assumption that prevalence in the residual specimens and the patient group are equivalent to the population it is taken to represent Figure 1. This is not always the case and although patient groups have been chosen to overcome this problem for example generally avoiding patients with disease, or gathering information so that data from those with disease can be excluded and adjustments made, 60 some bias will undoubtedly encroach.

This may effect estimates of prevalence but it will not necessarily prejudice trend detection if any bias is constant over time.

Introduction

Certain population groups are not amenable to this form of surveillance; for example, men at general or lower risk of infection because there is no population group having routine blood tests as do pregnant women. Equally there are marginalized groups that are very hard to reach and monitor e. The fact that results cannot be tracked back to the original patients is also limiting as it means clusters of positives and local rises in prevalence cannot be directly investigated. In general therefore the programmes are here best used in combination with other data. The unlinked programmes have been a good investment Table 5.

Unlinked anonymous seroprevalence monitoring programmes' principles and aims. Unlinked anonymous seroprevalence monitoring programme: UK continuing surveys, numbers of centres, districts and specimen numbers Surveys and source populations and geographical distribution of centres in the UK programme. In addition the programme has been enacted by many collaborators who are listed regularly in the annual reports of the programme. The programmes and many of their complementary data sources are supported by public funding through the UK Departments of Health and the Medical Research Council.

JAMA ; : — Human immunodeficiency viruses in patients attending a sexually transmitted disease clinic in London, —7. Br Med J ; : — Genitourin Med ; 43 : — HIV infection transmitted through blood product treatment, blood transfusion, and tissue transplantation. CDR Rev ; 7 : — Doll R. A proposal for doing prevalence studies of AIDS. Br Med J ; : Monitoring the prevalence of HIV: foundations for a programme of unlinked anonymous testing in England and Wales.

Prevalence of maternal HIV infection based on unlinked anonymous testing of newborn babies.

Lancet ; : — Prevalence of maternal HIV infection in Scotland based on unlinked anonymous testing of newborn babies. Lancet ; i : — Heptonstall J, Gill ON. The legal and ethical basis for unlinked anonymous HIV testing. Commun Dis Rep ; 48 : 3 —6. Scott Med J ; 41 : — Unlinked Anonymous Surveys Steering Group.

World Health Organization. Unlinked anonymous screening for the public health surveillance of HIV infections. Proposed international guidelines. Chin J. Bull World Health Organ ; 68 : — Public Health Rep ; : — Change in sexual behaviour and decline in HIV infection among young pregnant women in urban Uganda. AIDS ; 11 : — US Bureau of the Census.

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Prevention indicators for evaluating the progress of national AIDS programmes. AIDS ; 8 : — Provisional country estimates of prevalent adult human immunodeficiency virus infections as of the end of ; a description of the methods. Int J Epidemiol ; 27 : — Continuing transmission of sexually transmitted diseases among patients infected with HIV-1 attending genitourinary medicine clinics in England and Wales. Use of anonymous newborn serosurveys to evaluate antenatal HIV screening programmes.

J Med Screening ; 1 : — Novel assay for the detection of immunoglobulin G antihuman immunodeficiency virus in untreated saliva and urine. J Med Virol ; 41 : — Gelatin particle agglutination assay for HIV antibodies: a rapid economical modification with increased sensitivity.

Med Lab Sci ; 46 : — AIDS ; 3 : — Are seroepidemiological surveys for human immunodeficiency virus infection based on tests on pools of serum specimens accurate and cost-effective?

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Clin Diag Virol ; 1 : — Performance assessment of neonatal dried blood spot testing for HIV antibody. Commun Dis Rep ; 2 : R — J Public Health Med ; 18 : — J Epidemiol Infect ; : — Survey of HIV infection among pregnant women in England and Wales; results of the first four years — Commun Dis Rep ; 4 : R — Prevalence of HIV among childbearing women and women having termination of pregnancy: multidisciplinary steering group study.

HIV prevalence among heterosexuals attending genitourinary clinics in Scotland—the African connection. Ades AE. J Acquir Immune Defic Syndr ; 9 : — Catchpole MA. The role of epidemiology and surveillance systems in the control of sexually transmitted diseases. Genitourin Med ; 72 : — Scottish Centre for Infection and Environment Health. Glasgow, Prevalence of maternal HIV-1 infection in Thames Regions: results from anonymous unlinked neonatal testing. Epidemiology and detection of HIV-1 among pregnant women in the United Kingdom: results from national surveillance systems — Two methods for assessing the risk-factor composition of the HIV-1 epidemic in heterosexual women: Southeast England, — AIDS ; 6 : — An investigation of assessing the fraction of HIV infection attributable to ethnic group variations at risk.

Int J Epidemiol ; 24 : S15 — McGarrigle C, Nicoll A, for a collaborative group. Prevalence of HIV-1 among attenders at sexually transmitted disease clinics: analyses according to country of birth. Sex Transm Infect ; 74 : — Nardone A, Mercey D. Data to the End of United Kingdom Departments of Health. London: Department of Health, Wellings K, Field B.

London: Longman, J Public Policy ; 13 : — Hughes G. HIV prevalence in the United Kingdom. Commun Dis Rep ; 9 : — Expert Advisory Group. Chlamydia trachomatis. Department of Health, An estimate of the prevalence of human immunodeficiency virus infection in England and Wales by using a direct method. J R Statist Soc ; : 89 — Sexual Attitudes and Lifestyles.

Oxford: Blackwell Scientific Publications, Genitourin Med ; 73 : — Interpreting HIV seroprevalence data from pregnant women. J AIDS ; 13 : — How closely does HIV prevalence in pregnant women reflect the prevalence in women of reproductive age? A validated method for adjustment. AIDS ; 12 : — CDR Rev ; 6 : R1 — Department of Health. The Health of the Nation. A Summary of the Strategy for Health in England.

London: HMSO, Molesworth A. CDR Rev ; 7 : 77 — AIDS ; 10 : — Edinburgh: NHS, Voluntary universal antenatal HIV testing. Br J Obstet Gynaecol ; : — Antenatal HIV testing: is uptake dependent on the individual midwife?

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A prospective observational study. Commun Dis Rep ; 9: 45— J Med Screening ; 5 : — J Med Screening ; 2 : 35 — AIDS ; 11 : F53 — Selective versus universal antenatal HIV testing: epidemiological and implementation factors in policy choice. AIDS in press. Nicoll A. NHS Executive. Reducing mother to baby transmission of HIV. Indirect methods for estimating prevalent HIV infection in adults in England and Wales at the end of Epidemiol Infect ; : —

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