Editorial: HIV partner notification: a neglected prevention intervention

Anticipated Notification of Sexual Partners following STD Diagnosis among Men Who Have Sex with Men and Transgender Women in Lima, Peru: A Mixed Methods Analysis

BACKGROUND

New strategies to support partner notification (PN) are critical for STD control and require detailed understanding of how specific individual and partnership characteristics guide notification decisions.

METHODS

From 2011 to 2012, 397 MSM and TW recently diagnosed with HIV, syphilis, or another STD completed a survey on anticipated notification of recent sexual partners and associated factors. Qualitative interviews were conducted with a subset of participants to provide further depth to quantitative findings. Prevalence ratios and generalized estimating equation (GEE) models were used to analyze participant- and partner-level factors associated with anticipated PN.

RESULTS

Among all partners reported, 52.5% were described as "Very Likely" or "Somewhat Likely" to be notified. Anticipated notification was more likely for main partners than casual (adjusted Prevalence Ratio [aPR], 95% CI: 0.63, 0.54-0.75) or commercial (aPR, 95% CI: 0.44, 0.31-0.62) partners. Other factors associated with likely notification included perception of the partner as an STD source (aPR, 95% CI: 1.27, 1.10-1.48) and anticipated future sexual contact with the partner (aPR, 95% CI: 1.30, 1.11-1.52). An HIV diagnosis was associated with a lower likelihood of notification than non-HIV STDs (aPR: 0.68, 0.55-0.86). Qualitative discussion of the barriers and incentives to PN reflected a similar differentiation of anticipated notification according to partnership type and type of HIV/STD diagnosis.

DISCUSSION

Detailed attention to how partnership characteristics guide notification outcomes is essential to the development of new PN strategies. By accurately and thoroughly assessing the diversity of partnership interactions among individuals with HIV/STD, new notification techniques can be tailored to partner-specific circumstances.

Next-Generation Methods for HIV Partner Services: A Systematic Review

Partner notification is a widely accepted method whose intent is to limit onward HIV transmission. With increasing use of new technologies such as text messaging, e-mail, and social network sites, there is growing interest in using these techniques for "next-generation" HIV partner services (PS). We conducted a systematic review to assess the use and effectiveness of these technologies in HIV PS. Our literature search resulted in 1343 citations, with 7 meeting inclusion criteria. We found programs in 2 domains: (1) Public Health Department usage of new technologies to augment traditional partner notification (n = 3) and (2) patient or provider-led usage of partner notification Web sites (n = 4) The health department-based efforts showed an ability to find new cases in a previously unreachable population but in the limited comparisons to traditional PS had a lower rate of successful contact. Usage data from the partner notification Web sites revealed a high total number of e-notifications sent, with less than 10% of cards sent for HIV. Clear evidence on outcomes and directly traceable utilization for these Web services was lacking. When given a choice, most clients chose to send e-notifications via text versus e-mail. Although successful notification may be lower overall, use of next-generation services provides an avenue to contact those who would previously have been untraceable. Additional research is needed to determine to what extent technology-enhanced PS improves the identification of newly infected persons as well as the initiation of new prevention interventions for HIV-negative clients within high-risk networks.

Potential impact and acceptability of Internet partner notification for men who have sex with men and transgender women recently diagnosed as having sexually transmitted disease in Lima, Peru

We assessed the potential impact of Internet partner notification among men who have sex with men and transgender women in Peru recently diagnosed as having sexually transmitted disease. Use of Internet partner notification was anticipated for 55.9% of recent partners, including 43.0% of partners not currently expected to be notified, a 20.6% increase in anticipated notification outcomes.

Contact tracing using provider referral: how difficult is it?

Contact tracing using provider referral is often perceived as time-consuming. To assess the workload involved in provider referral at a sexual health clinic, we studied the number of attempts required, the contact method used, the time taken and the success of provider referral for 230 contacts referred over a 3-year period. For 87% of these contacts, a mobile number was available; 78.7% of these were successfully contacted. A median of two calls was required and the median time to complete the contact tracing process was within the same day. In 91% of cases, contact tracing was successful. In our setting, provider notification was not time-consuming.

An audit of partner notification for syphilis and HIV

Partner notification (PN) is a vital tool used by genitourinary (GU) medicine services in the public health control of sexually transmitted infections. We audited our PN outcomes for syphilis and HIV, over an 18-month period, at the Edinburgh GUM clinic. Follow-up information on testing was only available for 58% of traceable syphilis contacts and 59% of traceable HIV contacts, though substantially larger percentages in each case, respectively 78% and 90%, were informed regarding their risk of exposure. Furthermore, the department achieved screening verification in 78% of identifiable syphilis contacts and 94% of identifiable HIV partners.

Psychosocial and behavioral predictors of partner notification after HIV and STI exposure and infection among MSM

Partner notification (PN) is an essential element of local and state-level HIV/STI prevention and control programs. The current study quantitatively assessed the psychosocial and behavioral predictors of PN use among men who have sex with men (MSM) (n = 189) using multivariable logistic regression procedures. STI history or being HIV-infected were significant predictors of having notified past sexual partners of HIV/STI exposure; engaging in unprotected insertive anal sex and using poppers during sex in the 12 months prior to enrollment resulted in greater odds of PN. Symptoms of social anxiety and having a drinking problem were significant predictors of future willingness to use state department of public health PN services. Efforts to increase PN acceptability should focus on HIV-uninfected MSM, particularly those with STI history. Results suggest how to increase acceptability and use of PN as a public health strategy and underscore the need for counseling as part of the notification process.

Incorporating rapid HIV testing into partner counseling and referral services

OBJECTIVES

Partner counseling and referral services (PCRS) provide a unique opportunity to decrease transmission of human immunodeficiency virus (HIV) by notifying sex and drug-injection partners of HIV-infected individuals of their exposure to HIV. We incorporated rapid HIV testing into PCRS to reduce barriers associated with conventional HIV testing and identify undiagnosed HIV infection within this high-risk population.

METHODS

From April 2004 through June 2006, HIV-infected people (index clients) were interviewed, and their partners were notified of their potential exposure to HIV and offered rapid HIV testing at six sites in the United States. The numbers of index clients participating and the numbers of partners interviewed and tested were compared by site. Descriptive and bivariate analyses were performed.

RESULTS

A total of 2,678 index clients were identified, of whom 779 (29%) provided partner locating information. A total of 1,048 partners were elicited, of whom 463 (44%) were both interviewed and tested for HIV. Thirty-seven partners (8%) were newly diagnosed with HIV. The number of index clients interviewed to identify one partner with newly diagnosed HIV infection ranged from 10 to 137 at the participating sites.

CONCLUSIONS

PCRS provides testing and prevention services to people at high risk for HIV infection. Incorporating rapid HIV testing into PCRS and identifying previously undiagnosed infections likely confer individual and public health benefits. Further evaluation is needed to determine the best methods of identifying partners with previously unrecognized HIV infection.

HIV partner notification outcomes for HIV-infected patients by duration of infection, San Francisco, 2004 to 2006

BACKGROUND

The San Francisco Department of Public Health conducts HIV third-party partner notification in the following populations based on standard Centers for Disease Control and Prevention (CDC) guidelines: (1) persons with acute and nonacute incident HIV infection tested at the municipal sexually transmitted disease (STD) clinic and the county hospital and (2) all county residents with early syphilis and long-standing HIV infection.

METHODS

We reviewed routinely collected demographic and partner notification outcome data among acute and nonacute cases between 2004 and 2006 and among long-standing cases between July 2005 and December 2006. Outcomes were examined among the 3 case types.

RESULTS

Most acute (n = 30), nonacute (n = 398), and long-standing cases (n = 335) occurred in gay/bisexual men (89%), and most case-patients were interviewed (80%). In acute and nonacute cases, 13% of partners tested for HIV were newly identified as HIV-infected. The number of patients interviewed per new HIV infection identified was 25 for acute cases, 21 for nonacute cases, and 39 for long-standing cases; however, half of recent new HIV infections were identified among partners of long-standing patients. Few patients or partners refused partner notification services.

CONCLUSIONS

Partner notification was acceptable and successfully identified new HIV infections. Other jurisdictions should consider implementing or expanding partner notification for HIV infection. More evaluation is needed of the effectiveness of partner notification among HIV-infected persons with other STDs.

Partner Notification for Gonococcal and Chlamydial Infections in Men Who Have Sex With Men: Success Is Underestimated by Traditional Disposition Codes

BACKGROUND

Recent reports evaluating partner notification (PN) efforts among men who have sex with men (MSM) have observed relatively poor outcomes. However, the validity of traditional PN disposition codes is not known, possibly leading to overly pessimistic assessments of PN outcomes.

OBJECTIVES

To evaluate PN practices among MSM with gonococcal or chlamydial infection, assess the utility of offering MSM PN assistance and compare patient self-reported PN outcomes with those recorded using Disease Intervention Specialist (DIS) disposition codes.

STUDY DESIGN

We reviewed the records of all MSM with gonococcal or chlamydial infection interviewed by Public Health-Seattle and King County for purposes of PN in 2004. Men were asked to indicate whether each of their sex partners were already notified or treated at time of interview and were offered PN assistance.

RESULTS

DIS interviewed 409 of 628 (65%) MSM reported with gonococcal or chlamydial infection. Three hundred thirteen of the 409 (76%) interviewed men provided information about their number of sex partners in the 60 days before diagnosis and specific information about 1 or more of their potentially exposed partners. These index cases reported a total of 1037 sex partners, but provided information about only 634 (61%). Two hundred thirteen of the 313 (68%) index cases reported notifying at least 1 partner. Index cases reported that 295 of all 1037 (28%) reported partners had been notified, and that 170 (16%) were treated; DIS disposition codes documented the treatment of 111 (11%) partners. Only 18 (6%) index cases requested DIS assistance contacting a partner; DIS notified and assured the treatment of 24 of the 35 (69%) partners reported by these 18 men.

CONCLUSIONS

Although MSM with gonorrhea or chlamydia seldom accept assistance notifying partners, they report higher levels of partner treatment than suggested by DIS disposition codes, with 68% indicating that they had notified at least 1 sex partner and 46% reporting that at least 1 of their partners received treated.

A novel emergency department based prevention intervention program for people living with HIV: evaluation of early experiences

BACKGROUND

HIV prevention is increasingly focused on people living with HIV (PLWH) and the role of healthcare settings in prevention. Emergency Departments (EDs) frequently care for PLWH, but do not typically endorse a prevention mission. We conducted a pilot exploratory evaluation of the first reported ED program to address the prevention needs of PLWH.

METHODS

This retrospective observational cohort evaluation reviewed program records to describe the first six months of participants and programmatic operation. Trained counselors provided a risk assessment and counseling intervention combined with three linkage interventions: i) linkage to health care, ii) linkage to case management, and iii) linkage to partner counseling and referral.

RESULTS

Of 81 self-identified PLWH who were approached, 55 initially agreed to participate. Of those completing risk assessment, 17/53 (32%, 95 CI 20% to 46%) reported unprotected anal/vaginal intercourse or needle sharing in the past six months with a partner presumed to be HIV negative. Counseling was provided to 52/53 (98%). For those requesting services, 11/15 (73%) were linked to healthcare, 4/23 (17%) were coordinated with case management, and 1/4 (25%) completed partner counseling and referral.

CONCLUSION

Given base resources of trained counselors, it was feasible to implement a program to address the prevention needs for persons living with HIV in an urban ED. ED patients with HIV often have unmet needs which might be addressed by improved linkage with existing community resources. Healthcare and prevention barriers for PLWH may be attenuated if EDs were to incorporate CDC recommended prevention measures for healthcare providers.

Optimal mix of screening and contact tracing for endemic diseases

Two common means of controlling infectious diseases are screening and contact tracing. Which should be used, and when? We consider the problem of determining the cheapest mix of screening and contact tracing necessary to achieve a desired endemic prevalence of a disease or to identify a specified number of cases. We perform a partial equilibrium analysis of small-scale interventions, assuming that prevalence is unaffected by the intervention; we develop a full equilibrium analysis where we compare the long-term cost of various combinations of screening and contact tracing needed to achieve a given equilibrium prevalence; and we solve the problem of minimizing the total costs of identifying and treating disease cases plus the cost of untreated disease cases. Our analysis provides several insights. First, contact tracing is only cost effective when prevalence is below a threshold value. This threshold depends on the relative cost per case found by screening versus contact tracing. Second, for a given contact tracing policy, the screening rate needed to achieve a given prevalence or identify a specified number of cases is a decreasing function of disease prevalence. As prevalence increases above the threshold (and contact tracing is discontinued), the screening rate jumps discontinuously to a higher level. Third, these qualitative results hold when we consider unchanged or changed prevalence, and short-term or long-term costs.

The effectiveness of HIV partner counseling and referral services in increasing identification of HIV-positive individuals a systematic review

Partner counseling and referral services (PCRS) are part of the spectrum of care for HIV-positive people and their sexual or needle-sharing partners. Referral includes notifying partners of exposure, after which they are (ideally) tested and receive prevention or risk reduction counseling or enter into care (if they test positive). Using The Guide to Community Preventive Services's methods for systematic reviews, the effectiveness of PCRS was evaluated, including partner notification, in identifying a population at high risk of HIV infection and in increasing testing in those populations. In this review, PCRS efforts using provider referral were found to be effective in reaching a population with a high prevalence of HIV. Nine studies qualified for the review. In these studies, a range of one to eight partners was identified per index case (a person newly diagnosed with HIV who has partners who should be notified); a mean of 67% of identified partners were found and notified of their potential exposure to HIV, and a mean of 63% of those notified were tested (previously known "positives" were not tested). Of those tested, a mean of 20% were HIV positive. Therefore, even given that not all partners could be found and notified and that some who could be found did not accept testing, 1% to 8% of people named as potentially exposed and not previously known to be HIV positive were identified as HIV positive through partner notification (although these people were not necessarily infected by the index case). Evidence was insufficient to determine whether PCRS, including partner notification, was also effective in changing behavior or reducing transmission because available studies did not generally report on these outcomes. Little empirical evidence was available to assess potential harm of the interventions, but current studies have not shown substantial harms. Based on Community Guide rules of evidence, sufficient evidence shows that PCRS with partner notification by a public health professional ("provider referral") effectively increases identification of a high-prevalence target population for HIV testing.

Late diagnosis of HIV infection among individuals with low, unrecognised or unacknowledged risks in England, Wales and Northern Ireland

A small number of UK nationals who have a low, unrecognised or unacknowledged risk for HIV present late in the course of HIV infection; often after frequent attendances to primary care physicians. Information from in-depth interviews with individuals diagnosed with HIV in England, Wales and Northern Ireland (EW&NI) was analysed. Those diagnosed because of HIV-related symptoms (late diagnoses) were compared with those diagnosed for other reasons. Of the 286 individuals interviewed, 157 (55%) had HIV-related symptoms at the time of diagnosis, and 129 were tested for other reasons. A greater proportion of those diagnosed late were male and older. Of the 157 late diagnoses, 77 were considered to have acquired HIV heterosexually in the UK, 19 heterosexually abroad, 16 through 'high-risk' behaviours, 15 heterosexually by a 'high-risk' partner, four through blood transfusion and the remainder through an unusual or unknown route. A significantly higher proportion of those diagnosed late had had a long-standing relationship. None had been informed by a current or ex-partner of their HIV status. Primary care physicians should consider HIV as a possibility when patients without an apparent risk for HIV-infection present with symptoms indicative of possible immune suppression. Sensitive partner notification practices that enable a greater number of individuals to inform their partners should be explored.

A systematic review of HIV partner counseling and referral services: client and provider attitudes, preferences, practices, and experiences

OBJECTIVES

The objectives of this study were to understand client and provider attitudes, experiences, and practices regarding HIV partner notification in the United States and to help identify future research and program needs.

GOALS

The goals of this study were to synthesize the literature reporting client and provider attitudes, experiences, and practices and to identify potential negative effects of HIV partner notification.

STUDY DESIGN

This study consisted of a systematic qualitative review.

RESULTS

Clients were willing to self-notify partners and participate in provider notification, and few reported negative effects. The majority of health care providers were in favor of HIV partner notification; however, they did not consistently refer index clients to HIV partner notification programs.

CONCLUSION

Considering that clients have positive attitudes toward self- and provider referral, local HIV prevention programs need to ensure that all HIV-positive clients are offered partner notification services. Additional research is needed to assess the potential risks of notifying partners and to identify effective techniques to improve client and provider participation.

Interval estimates for epidemic thresholds in two-sex network models

Epidemic thresholds in network models of heterogeneous populations characterized by highly right-skewed contact distributions can be very small. When the population is above the threshold, an epidemic is inevitable and conventional control measures to reduce the transmissibility of a pathogen will fail to eradicate it. We consider a two-sex network model for a sexually transmitted disease which assumes random mixing conditional on the degree distribution. We derive expressions for the basic reproductive number (R(0)) for one and heterogeneous two-population in terms of characteristics of the degree distributions and transmissibility. We calculate interval estimates for the epidemic thresholds for stochastic process models in three human populations based on representative surveys of sexual behavior (Uganda, Sweden, USA). For Uganda and Sweden, the epidemic threshold is greater than zero with high confidence. For the USA, the interval includes zero. We discuss the implications of these findings along with the limitations of epidemic models which assume random mixing.

Recent HIV Testing Among Young Men Who Have Sex With Men: Correlates, Contexts, and HIV Seroconversion

OBJECTIVES

We evaluated the correlates and contexts of HIV testing within the past year, subsequent risk reduction, and HIV seroconversion among young men who have sex with men (MSM).

METHODS

Young men aged 23 to 29 years were approached, interviewed, counseled, and tested for HIV at 181 randomly sampled MSM-identified venues in six U.S. cities from 1998 through 2000. Analyses were restricted to 2,797 MSM who reported never testing HIV-positive.

RESULTS

Of the 2,797 MSM, 1,281 (46%) either never previously tested or had not tested in the past year (never/remote testers); 1,516 (54%) had tested in the past year (recent testers); and 271 (10%) tested HIV-positive as part of the study. Of 1,885 recent sex partners reported by HIV-infected participants, 68% were partners of never/remote testers. Of recent testers, 50% tested anonymously, 51% tested because of specific risks, 59% were counseled, 47% reported reducing their risks after testing, and 8% tested HIV-positive (percent HIV-infected by race: blacks, 24%; Hispanics, 6%; whites, 4%; Asians, 1%).

CONCLUSION

Nearly half of young MSM participants had not tested in the past year and HIV-infected never/remote testers accounted for approximately two thirds of recent partners potentially exposed to HIV. Of those who had tested recently, many MSM, especially those who are black, had already acquired HIV. To reduce HIV transmission and facilitate early diagnosis and entry into care, increased HIV testing among young at-risk MSM in the United States, especially those who are black, is needed.

Case-Finding Effectiveness of Partner Notification and Cluster Investigation for Sexually Transmitted Diseases/HIV

OBJECTIVE

To assess the case-finding effectiveness of partner notification(PN) and cluster investigation for sexually transmitted disease (STD)/human immunodeficiency virus (HIV).

STUDY

Literature review and quantitative summary.

RESULTS

Since 1975, the median case-finding yield for syphilis, gonorrhea, and chlamydia PN reported in the literature is about 1 new case found for every 4 or 5 cases interviewed. The yield from HIV PN is approximately half as large, although there is substantial variability in yield across reports for each disease. Published reports underline the central role provider referral plays in effective PN and case-finding. Successful PN is more likely with index cases who are of majority ethnicity and detected through screening or spontaneous presentation for care with symptoms and with partners with whom index cases have had sexual contact that is recent, frequent, and of long duration. The case-finding yield for HIV PN also is much higher when cases are diagnosed through confidential, rather than anonymous, testing. Cluster investigation and related strategies tend to have lower case-finding yields than PN but can play a very useful case-finding role, especially in settings with high disease incidence.

CONCLUSIONS

STD/HIV PN and cluster investigation can contribute meaningfully to case finding. More research is needed to strengthen the empiric foundation of PN and related strategies, including the impact they have on disease transmission.

HIV Partner Notification in the United States

OBJECTIVE

The objective of this study was to define the scope and case-finding success of HIV partner notification (PN) in the United States.

STUDY

The authors conducted an analysis of PN data from metropolitan areas >500,000 reporting > or =200AIDS cases in 2001.

RESULTS

Data were collected from 28 (72%) of 39 eligible jurisdictions. In 22 jurisdictions with reportable HIV, health departments interviewed 32% of 20,353 persons with newly reported HIV. Among 6394 sex or needle-sharing partners, 19% had been previously HIV-diagnosed; 10% tested HIV-positive; 32% tested HIV-negative; and 39% were not notified, denied previous HIV diagnosis and refused HIV testing, or outcome was unknown. Health departments interviewed 13.8 persons to identify 1 new case of HIV (range, 1.0-196). Areas in which larger proportions of AIDS cases occurred among men who have sex with men reported less success identifying new cases of HIV through PN.

CONCLUSIONS

HIV PN programs identify new cases of HIV but have variable success and affect a minority of persons reported with HIV.

Primary HIV infection

Primary HIV infection is a critical and highly dynamic time period in the course of HIV infection. The initial pathologic processes are important in determining long-term disease progression. In the absence of our ability to eradicate the virus, identifying individuals during primary HIV infection and performing interventions that optimize outcome are important to provide adequate care to a newly infected patient and, from a public health perspective, to identify sexual networks and provide a platform to reduce HIV exposures during a time of high viremia.

Partner notification for HIV and STD in the United States: low coverage for gonorrhea, chlamydial infection, and HIV

BACKGROUND

Little is known about the scope of current public health partner-notification (PN) activities in the United States.

GOAL

The goal of the study was to define what PN services U.S. health departments provide in areas with high STD/HIV-related morbidity.

STUDY DESIGN

The study involved a survey of STD program staff members in U.S. areas with the highest reported rates of infectious syphilis, gonorrhea, chlamydia, and HIV in 1998.

RESULTS

Staff members of 60 (77%) of 78 health departments provided data. PN interviews were conducted with 7583 (89%) of 8492 cases of syphilis, 23,097 (17%) of 139,287 cases of gonorrhea, and 26,487 (12%) of 228,210 cases of chlamydia. In areas with mandatory HIV reporting, 4375 (52%) of 8328 persons infected with HIV were interviewed for PN.

CONCLUSIONS

Except for patients with syphilis, public health PN services affect only a minority of persons with STD or HIV infection in high-morbidity areas of the United States.