Sexual behavior of HIV discordant couples after HIV counseling and testing

High prevalence of self-reported undiagnosed HIV despite high coverage of HIV testing: a cross-sectional population based sero-survey in South Africa

Objectives

To measure HIV prevalence and uptake of HIV counseling and testing (HCT) in a peri-urban South African community. To assess predictors for previous HIV testing and the association between the yield of previously undiagnosed HIV and time of last negative HIV test

Methods

A random sample of 10% of the adult population (≥15 years) were invited to attend a mobile HCT service. Study procedures included a questionnaire, HIV testing and CD4 counts. Predictors for previous testing were determined using a binominal model.

Results

1,144 (88.0%) of 1,300 randomly selected individuals participated in the study. 71.0% (68.3–73.6) had previously had an HIV test and 37.5% (34.6–40.5) had tested in the past 12 months. Men, migrants and older (>35 years) and younger (<20 years) individuals were less likely to have had a previous HIV test. Overall HIV prevalence was 22.7 (20.3–25.3) with peak prevalence of 41.8% (35.8–47.8) in women aged 25.1–35 years and 37.5% (26.7–48.3) in men aged 25.1–45 years. Prevalence of previously undiagnosed HIV was 10.3% (8.5–12.1) overall and 4.5% (2.3–6.6), 8.0% (CI 3.9–12.0) and 20.0% (13.2–26.8) in individuals who had their most recent HIV test within 1, 1–2 and more than 2 years prior to the survey.

Conclusion

The high burden of undiagnosed HIV in individuals who had recently tested underscores the importance of frequent repeat testing at least annually. The high prevalence of previously undiagnosed HIV in individuals reporting a negative test in the 12 months preceding the survey indicates a very high incidence. Innovative prevention strategies are needed.

HIV incidence and risk factors for acquisition in HIV discordant couples in Masaka, Uganda: an HIV vaccine preparedness study

Objectives

To determine the incidence of and risk factors for HIV acquisition in a cohort of HIV-uninfected partners from HIV discordant couples in Masaka, Uganda, and to establish its suitability for HIV vaccine trials.

Methods

HIV-uninfected adults living in HIV discordant couple relationships were enrolled and followed for 2 years. Interviews, medical investigations, HIV counseling and testing, syphilis and urine pregnancy (women) tests were performed at quarterly visits. Sexual risk behaviour data were collected every 6 months.

Results

495 participants were enrolled, of whom 34 seroconverted during 786.6 person-years of observation (PYO). The overall HIV incidence rate [95% confidence interval (CI)] was 4.3 [3.1–6]; and 4.3 [2.8–6.4] and 4.4 [2.5–8] per 100 PYO in men and women respectively. Independent baseline predictors for HIV acquisition were young age [18–24 (aRR = 4.1, 95% CI 1.6–10.8) and 25–34 (aRR = 2.7, 95% CI 1.2–5.8) years]; alcohol use (aRR = 2.6, 95% CI 1.1–6); and reported genital discharge (aRR = 3.4, 95% CI 1.6–7.2) in the past year. Condom use frequency in the year preceding enrolment was predictive of a reduced risk of HIV acquisition [sometimes (aRR = 0.4, 95% CI 0.2–0.8); always (aRR = 0.1, 95% CI 0.02–0.9)]. In the follow-up risk analysis, young age [18–24 (aRR = 6.2, 95% CI 2.2–17.3) and 25-34 (aRR = 2.3, 95% CI 1.1–5.0) years], reported genital discharge (aRR = 2.5, 95% CI 1.1–5.5), serological syphilis (aRR 3.2, 95% CI 1.3–7.7) and the partner being ART naïve (aRR = 4.8, 95% CI 1.4–16.0) were independently associated with HIV acquisition. There were no seroconversions among participants who reported consistent condom use during the study.

Conclusions

The study has identified important risk factors for HIV acquisition among HIV discordant couples. HIV-uninfected partners in discordant couples may be a suitable population for HIV vaccine efficacy trials. However, recent confirmation that ART reduces heterosexual HIV transmission may make it unfeasible to conduct HIV prevention trials in this population.

Sexual relations and childbearing decisions of HIV-discordant couples: an exploratory study in South Africa and Tanzania

This article reports on the influence of HIV on sexual relations and childbearing decisions of 36 HIV-discordant couples, 26 in South Africa and 10 in Tanzania, recruited into an exploratory study through hospital antiretroviral treatment clinics and civil society organisations working with people living with HIV. Self-administered questionnaires were used to obtain social and demographic information, while couples' sexual relations and childbearing decisions were explored through in-depth, semi-structured individual and couple interviews. The majority of the HIV-positive partners were women, who were on antiretroviral treatment. Almost one-third of South African respondents and half of those in Tanzania reported experiences of tension related to HIV-discordance, while more than half of the South Africans and almost three-quarters of the Tanzanians reported that intimacy had been affected by their discordant status. Those without children were more likely to desire children (17/23) than those who already had children (16/44), although this desire was influenced by fear of HIV transmission to the negative partner and medical professional advice. The study points to the need for targeted information for HIV discordant couples, as well as couple counselling and support services.

Disparate associations of HLA class I markers with HIV-1 acquisition and control of viremia in an African population

BACKGROUND

Acquisition of human immunodeficiency virus type 1 (HIV-1) infection is mediated by a combination of characteristics of the infectious and the susceptible member of a transmission pair, including human behavioral and genetic factors, as well as viral fitness and tropism. Here we report on the impact of established and potential new HLA class I determinants of heterosexual HIV-1 acquisition in the HIV-1-exposed seronegative (HESN) partners of serodiscordant Zambian couples.

METHODOLOGY/PRINCIPAL FINDINGS

We assessed the relationships of behavioral and clinically documented risk factors, index partner viral load, and host genetic markers to HIV-1 transmission among 568 cohabiting couples followed for at least nine months. We genotyped subjects for three classical HLA class I genes known to influence immune control of HIV-1 infection. From 1995 to December 2006, 240 HESNs seroconverted and 328 remained seronegative. In Cox proportional hazards models, HLA-A*68:02 and the B*42-C*17 haplotype in HESN partners were significantly and independently associated with faster HIV-1 acquisition (relative hazards = 1.57 and 1.55; p = 0.007 and 0.013, respectively) after controlling for other previously established contributing factors in the index partner (viral load and specific class I alleles), in the HESN partner (age, gender), or in the couple (behavioral and clinical risk score). Few if any previously implicated class I markers were associated here with the rate of acquiring infection.

CONCLUSIONS/SIGNIFICANCE

A few HLA class I markers showed modest effects on acquisition of HIV-1 subtype C infection in HESN partners of discordant Zambian couples. However, the striking disparity between those few markers and the more numerous, different markers found to determine HIV-1 disease course makes it highly unlikely that, whatever the influence of class I variation on the rate of infection, the mechanism mediating that phenomenon is identical to that involved in disease control.

The importance of male partner involvement for women's acceptability and adherence to female-initiated HIV prevention methods in Zimbabwe

Enlisting male partner involvement is perceived as an important component of women's successful uptake of female-initiated HIV prevention methods. We conducted a longitudinal study among a cohort of 955 Zimbabwean women participating in a clinical trial of the effectiveness of a female-initiated HIV prevention method (the diaphragm and lubricant gel) to: (a) describe the extent to which women involved their male partners in the decision to use the study products, and (b) measure the effect perceived male partner support had on their acceptability and consistent use of these methods. Reported levels of male partner involvement in discussions and decisions regarding: joining the study, study activities, the outcome of HIV/STI test results, and product use were very high. In multivariate analyses, regular disclosure of study product use and partner approval for the diaphragm and gel were significantly associated with women's acceptability and consistent use of the products; an essential component for determining efficacy of investigational prevention methods. These results support the need for more sophisticated measurement of how couples interact to make decisions that impact study participation and investigational product use as well as more rigorous adaptations and evaluations of existing strategies to involve male partners in female-initiated HIV prevention trials.

Community-based intervention to increase HIV testing and case detection in people aged 16-32 years in Tanzania, Zimbabwe, and Thailand (NIMH Project Accept, HPTN 043): a randomised study

BACKGROUND

In developing countries, most people infected with HIV do not know their infection status. We aimed to assess whether HIV testing could be increased by combination of community mobilisation, mobile community-based voluntary counselling and testing (VCT), and support after testing.

METHODS

Project Accept is underway in ten communities in Tanzania, eight in Zimbabwe, and 14 in Thailand. Communities at each site were paired according to similar demographic and environmental characteristics, and one community from each pair was randomly assigned to receive standard clinic-based VCT (SVCT), and the other community was assigned to receive community-based VCT (CBVCT) plus access to SVCT. Randomisation and assignment of communities to intervention groups was done by the statistics centre by computer; no one was masked to treatment assignment because the interventions were community based. Intervention was provided for about 3 years (2006-09). The primary endpoint of HIV incidence is pending completion of assessments after the intervention. In this interim analysis, we examined the secondary endpoint of uptake in HIV testing, differences in characteristics of clients receiving their first HIV test, and repeat testing. Analyses were limited to clients aged 16-32 years. This study is registered with ClinicalTrials.gov, number NCT00203749.

FINDINGS

The proportion of clients receiving their first HIV test during the study was higher in CBVCT communities than in SVCT communities in Tanzania (2341 [37%] of 6250 vs 579 [9%] of 6733), Zimbabwe (5437 [51%] of 10,700 vs 602 [5%] of 12,150), and Thailand (7802 [69%] of 11,290 vs 2319 [23%] 10,033). The mean difference in the proportion of clients receiving HIV testing between CBVCT and SVCT communities was 40·2% (95% CI 15·8-64·7; p=0·019) across three community pairs (one per country). HIV prevalence was higher in SVCT communities than in CBVCT communities, but CBVCT detected almost four times more HIV cases than did SVCT across the three study sites (952 vs 264; p=0·003). Repeat HIV testing in CBVCT communities increased in all sites to reach 28% of all those testing for HIV by the end of the intervention period.

INTERPRETATION

CBVCT should be considered as a viable intervention to increase detection of HIV infection, especially in regions with restricted access to clinic-based VCT and support services after testing.

FUNDING

US National Institute of Mental Health, HIV Prevention Trials Network (via US National Institute of Allergy and Infectious Diseases), and US National Institutes of Health.

Defining male support during and after pregnancy from the perspective of HIV-positive and HIV-negative women in Durban, South Africa

INTRODUCTION

Greater male support during pregnancy and in the postpartum period may improve health outcomes for mothers and children. To develop effective strategies to engage men, we need to first understand the ways that men are currently engaged and the barriers to their greater involvement.

METHODS

We conducted in-depth interviews in isiZulu with 30 HIV-positive women and 16 HIV-negative women who received prenatal care from a public clinic in Durban, South Africa. Interviews were audiotaped, transcribed, translated, and coded for analysis.

RESULTS

Although less than a quarter of women reported that their partners accompanied them to the clinic, they described receiving other material and psychosocial support from partners. More HIV-positive women reported that their partners were not involved or not supportive, and in some cases direct threats and experiences with violence caused them to fear partner involvement.

DISCUSSION

We need to broaden the lens through which we consider male support during pregnancy and in the postpartum period and acknowledge that male involvement may not always be in the best interest of women. Engaging supportive partners outside of the clinic setting and incorporating other important social network members are important next steps in the effort to increase support for women.

Variations in condom use by type of partner in 13 sub-Saharan African countries

Using nationally representative data from 13 sub-Saharan African countries, we reinforce and expand upon previous findings that men report using condoms more frequently than women do and that unmarried respondents report that they use condoms with casual partners more frequently than married individuals report using them with their spouses. Based on descriptive, bivariate, and multivariate analyses, we also demonstrate to a degree not previously shown in the current literature that married men from most countries report using condoms with extramarital partners about as frequently as unmarried men report using them with casual partners. Married women from most of the countries included in the study reported using condoms with extramarital partners less frequently than unmarried women reported using them with casual partners. This result is especially troubling because marriage usually ensures regular sexual intercourse, thereby providing more opportunities for a person to pass HIV infection from an extramarital partner to his or her spouse. These findings about high-risk behaviors can be used to better target future HIV-transmission-prevention efforts.

Sexual risk behaviors among HIV-infected South Indian couples in the HAART era: implications for reproductive health and HIV care delivery

The current study examines sexual behaviors among HIV-infected Indians in primary care, where access to highly active antiretroviral therapy (HAART) has recently increased. Between January and April 2008, we assessed the sexual behaviors of 247 HIV-infected South Indians in care. Multivariable logistic regression models were used to determine predictors of being in a HIV-seroconcordant primary relationship, being sexually active, and reporting unprotected sex. Over three-fourths (80%) of participants were HAART-experienced. Among the 58% of participants who were currently in a seroconcordant relationship, one-third were serodiscordant when enrolling into care. Approximately two-thirds (63.2%) of participants were sexually active; 9.0% reported unprotected sex. In the multivariable analyses, participants who were in a seroconcordant primary relationship were more likely to have children, use alcohol, report unprotected sex, and have been enrolled in care for >12 months. Sexually active participants were more likely to be on HAART, have a prior tuberculosis diagnosis, test Herpes simplex type 2 antibody seropositive, and have low general health perceptions. Participants who reported unprotected sex were more likely to be in a seroconcordant relationship, be childless, want to have a child, and use alcohol. We did not document an association between HAART and unprotected sex. Among HIV-infected Indians in primary care, predictors of unprotected sex included alcohol use and desire for children. Prevention interventions for Indian couples should integrate reproductive health and alcohol use counseling at entry into care.

The association of HIV counseling and testing with HIV risk behaviors in a random population-based survey in Kisumu, Kenya

HIV testing has been promoted as a key HIV prevention strategy in low-resource settings, despite studies showing variable impact on risk behavior. We sought to examine rates of HIV testing and the association between testing and sexual risk behaviors in Kisumu, Kenya. Participants were interviewed about HIV testing and sexual risk behaviors. They then underwent HIV serologic testing. We found that 47% of women and 36% of men reported prior testing. Two-thirds of participants who tested HIV-positive in this study reported no prior HIV test. Women who had undergone recent testing were less likely to report high-risk behaviors than women who had never been tested; this was not seen among men. Although rates of HIV testing were higher than seen in previous studies, the majority of HIV-infected people were unaware of their status. Efforts should be made to increase HIV testing among this population.

Indeterminate and discrepant rapid HIV test results in couples' HIV testing and counselling centres in Africa

Background

Many HIV voluntary testing and counselling centres in Africa use rapid antibody tests, in parallel or in sequence, to establish same-day HIV status. The interpretation of indeterminate or discrepant results between different rapid tests on one sample poses a challenge. We investigated the use of an algorithm using three serial rapid HIV tests in cohabiting couples to resolve unclear serostatuses.

Methods

Heterosexual couples visited the Rwanda Zambia HIV Research Group testing centres in Kigali, Rwanda, and Lusaka, Zambia, to assess HIV infection status. Individuals with unclear HIV rapid antibody test results (indeterminate) or discrepant results were asked to return for repeat testing to resolve HIV status. If either partner of a couple tested positive or indeterminate with the screening test, both partners were tested with a confirmatory test. Individuals with indeterminate or discrepant results were further tested with a tie-breaker and monthly retesting. HIV-RNA viral load was determined when HIV status was not resolved by follow-up rapid testing. Individuals were classified based on two of three initial tests as "Positive", "Negative" or "Other". Follow-up testing and/or HIV-RNA viral load testing determined them as "Infected", "Uninfected" or "Unresolved".

Results

Of 45,820 individuals tested as couples, 2.3% (4.1% of couples) had at least one discrepant or indeterminate rapid result. A total of 65% of those individuals had follow-up testing and of those individuals initially classified as "Negative" by three initial rapid tests, less than 1% were resolved as "Infected". In contrast, of those individuals with at least one discrepant or indeterminate result who were initially classified as "Positive", only 46% were resolved as "Infected", while the remainder was resolved as "Uninfected" (46%) or "Unresolved" (8%). A positive HIV serostatus of one of the partners was a strong predictor of infection in the other partner as 48% of individuals who resolved as "Infected" had an HIV-infected spouse.

Conclusions

In more than 45,000 individuals counselled and tested as couples, only 5% of individuals with indeterminate or discrepant rapid HIV test results were HIV infected. This represented only 0.1% of all individuals tested. Thus, algorithms using screening, confirmatory and tie-breaker rapid tests are reliable with two of three tests negative, but not when two of three tests are positive. False positive antibody tests may persist. HIV-positive partner serostatus should prompt repeat testing.

Four-year treatment outcomes of adult patients enrolled in Mozambique's rapidly expanding antiretroviral therapy program

Background

In Mozambique during 2004–2007 numbers of adult patients (≥15 years old) enrolled on antiretroviral therapy (ART) increased about 16-fold, from <5,000 to 79,500. All ART patients were eligible for co-trimoxazole. ART program outcomes, and determinants of outcomes, have not yet been reported.

Methodology/Principal Findings

In a retrospective cohort study, we investigated rates of mortality, attrition (death, loss to follow-up, or treatment cessation), immunologic treatment failure, and regimen-switch, as well as determinants of selected outcomes, among a nationally representative sample of 2,596 adults initiating ART during 2004–2007. At ART initiation, median age of patients was 34 and 62% were female. Malnutrition and advanced disease were common; 18% of patients weighed <45 kilograms, and 15% were WHO stage IV. Median baseline CD4⁺ T-cell count was 153/µL and was lower for males than females (139/µL vs. 159/µL, p<0.01). Stavudine, lamivudine, and nevirapine or efavirenz were prescribed to 88% of patients; only 31% were prescribed co-trimoxazole. Mortality and attrition rates were 3.4 deaths and 19.8 attritions per 100 patient-years overall, and 12.9 deaths and 57.2 attritions per 100 patient-years in the first 90 days. Predictors of attrition included male sex [adjusted hazard ratio (AHR) 1.5; 95% confidence interval (CI), 1.3–1.8], weight <45 kg (AHR 2.1; 95% CI, 1.6–2.9, reference group >60 kg), WHO stage IV (AHR 1.7; 95% CI, 1.3–2.4, reference group WHO stage I/II), lack of co-trimoxazole prescription (AHR 1.4; 95% CI, 1.0–1.8), and later calendar year of ART initiation (AHR 1.5; 95% CI, 1.2–1.8). Rates of immunologic treatment failure and regimen-switch were 14.0 and 0.6 events per 100-patient years, respectively.

Conclusions

ART initiation at earlier disease stages and scale-up of co-trimoxazole among ART patients could improve outcomes. Research to determine reasons for low regimen-switch rates and increasing rates of attrition during program expansion is needed.

Attitudes towards couples-based HIV testing among MSM in three US cities

Couples-based voluntary HIV counseling and testing (CVCT)--in which couples receive counseling and their HIV test results together--has been shown to be an effective strategy among heterosexual sero-discordant couples in Africa for reducing HIV transmission by initiating behavioral change. This study examined attitudes towards CVCT among men who have sex with men (MSM) in three US cities. Four focus group discussions (FGD) were held with MSM in Atlanta, Chicago, and Seattle. Although initially hesitant, participants reported an overwhelming acceptance of CVCT. CVCT was seen as a sign of commitment within a relationship and was reported to be more appropriate for men in longer-term relationships. CVCT was also seen as providing a forum for the discussion of risk-taking within the relationship. Our results suggest that there may be a demand for CVCT among MSM in the United States, but some modifications to the existing African CVCT protocol may be needed.

Association of chemokine receptor gene (CCR2-CCR5) haplotypes with acquisition and control of HIV-1 infection in Zambians

Background

Polymorphisms in chemokine (C-C motif) receptors 2 and 5 genes (CCR2 and CCR5) have been associated with HIV-1 infection and disease progression. We investigated the impact of CCR2-CCR5 haplotypes on HIV-1 viral load (VL) and heterosexual transmission in an African cohort. Between 1995 and 2006, cohabiting Zambian couples discordant for HIV-1 (index seropositive and HIV-1 exposed seronegative {HESN}) were monitored prospectively to determine the role of host genetic factors in HIV-1 control and heterosexual transmission. Genotyping for eight CCR2 and CCR5 variants resolved nine previously recognized haplotypes. By regression and survival analytic techniques, controlling for non-genetic factors, we estimated the effects of these haplotypic variants on a) index partner VL, b) seroconverter VL, c) HIV-1 transmission by index partners, d) HIV-1 acquisition by HESN partners.

Results

Among 567 couples, 240 virologically linked transmission events had occurred through 2006. HHF*2 homozygosity was associated with significantly lower VL in seroconverters (mean beta = -0.58, log₁₀ P = 0.027) and the HHD/HHE diplotype was associated with significantly higher VL in the seroconverters (mean beta = 0.54, log₁₀ P = 0.014) adjusted for age and gender in multivariable model. HHD/HHE was associated with more rapid acquisition of infection by the HESNs (HR = 2.0, 95% CI = 1.20-3.43, P = 0.008), after adjustments for index partner VL and the presence of genital ulcer or inflammation in either partner in Cox multivariable models. The HHD/HHE effect was stronger in exposed females (HR = 2.1, 95% CI = 1.14-3.95, P = 0.018).

Conclusions

Among Zambian discordant couples, HIV-1 coreceptor gene haplotypes and diplotypes appear to modulate HIV-1 VL in seroconverters and alter the rate of HIV-1 acquisition by HESNs. These associations replicate or resemble findings reported in other African and European populations.

A randomized controlled trial to promote long-term contraceptive use among HIV-serodiscordant and concordant positive couples in Zambia

BACKGROUND

Countries facing high HIV prevalence often also experience high levels of fertility and low contraceptive use, suggesting high levels of unmet need for contraceptive services. In particular, the unique needs of couples with one or both partners HIV positive are largely missing from many current family planning efforts, which focus on the prevention of pregnancies in the absence of reduction of the risk of HIV and other sexually transmitted infections (STIs).

METHODS

This article presents an examination of contraceptive method uptake among a cohort of HIV serodiscordant and concordant positive study participants in Zambia.

RESULTS

Baseline contraceptive use was low; however, exposure to a video-based intervention that provided information on contraceptive methods and modeled desirable future planning behaviors dramatically increased the uptake of modern contraceptive methods.

CONCLUSIONS

Including information on family planning in voluntary counseling and testing (VCT) services in addition to tailoring the delivery of family planning information to meet the needs and concerns of HIV-positive women or those with HIV-positive partners is an essential step in the delivery of services and prevention efforts to reduce the transmission of HIV. Family planning and HIV prevention programs should integrate counseling on dual method use, combining condoms for HIV/STI prevention with a long-acting contraceptive for added protection against unplanned pregnancy.

Risk Factors for HSV-2 Infection among Sexual Partners of HSV-2/HIV-1 Co-Infected Persons

Background

Herpes simplex virus type 2 (HSV-2) is the most frequent cause of genital ulcer disease worldwide and has been associated with increased risk for HIV-1 acquisition and transmission. We conducted a cross-sectional analysis of risk factors for HSV-2 infection among HIV-1 uninfected partners, whose partners were co-infected with HIV-1 and HSV-2.

Methods

Between November 2004 and April 2007, 3408 HIV-discordant couples, in which the HIV-1 infected partners were HSV-2 seropositive with CD4 250 cells/mm³ or greater, were enrolled in an HSV-2 suppression trial to prevent HIV-1 transmission at 14 sites in 7 African countries. Clinical & behavioral data, HSV-2 and HIV-1 testing were conducted at enrolment. Univariate and multivariate Poisson regression analyses were performed separately, by gender of the HIV-1 infected partner.

Results

Among 3354 HIV-1 uninfected participants, 32% were female and overall 71% were HSV-2 seropositive. Among couples with female HIV-1 infected partners, HIV-1 plasma RNA [aPR 1.03; 95% CI: 0.99 to 1.06; p = 0.11] and CD4 count [aPR 1.00; 95% CI: 0.98 to 1.01; p = 0.48] in the HSV-2/HIV-1 dually infected female and circumcision in the HIV-1 uninfected male partner [aPR 0.94; 95% CI: 0.88 to 1.00; p = 0.06] were not associated with reduced risk of HSV-2 seropositivity, after adjusting for other factors.

Conclusions

In this cross-sectional analysis of African HIV-1 serodiscordant heterosexual couples with prevalent HSV-2 infection in the HIV-1 infected partner, HIV-1 plasma RNA and CD4 count in the dually-infected partner and male circumcision in the HIV-1 uninfected partner were not associated with HSV-2 concordance.

Trial Registration

ClinicalTrials.gov NCT00194519

Associations between HIV Antiretroviral Therapy and the Prevalence and Incidence of Pregnancy in Rakai, Uganda

Background. Use of antiretroviral therapy (ART) may be associated with higher pregnancy rates. Methods. The prevalence and incidence of pregnancy was assessed in 712 HIV+ pre-ART women of reproductive age (WRA) (15–45) and 244 HIV+ WRA initiating ART. Prevalence rate ratios (PRR), incidence rate ratios (IRR), and 95% confidence interval (CI) were assessed. Results. The incidence of pregnancy was 13.1/100 py among women in pre-ART care compared to 24.6/100 py among women on ART (IRR = 0.54; 95% CI 0.37, 0.81, p < 0.0017). The prevalence of pregnancy at ART initiation was 12.0% with CD4 counts 100–250 compared with 3.2% with CD4 <100 (PRR = 3.24, CI 1.51–6.93), and the incidence of pregnancy while on ART was highest in women with a good immunologic response. Desire for more children was a very important factor in fertility. Conclusion. ART was associated with increased pregnancy rates in HIV+ women, particularly those with higher CD4 counts and good immunologic response to therapy, suggesting a need to strengthen reproductive health services for both women and their partners that could address their fertility decisions/intentions particularly after ART initiation.

Lack of detectable HIV-1-specific CD8(+) T cell responses in Zambian HIV-1-exposed seronegative partners of HIV-1-positive individuals

Human immunodeficiency virus type 1 (HIV-1)-specific T cell responses were characterized in a blinded study involving infected individuals and their seronegative exposed uninfected (EU) partners from Lusaka, Zambia. HIV-1-specific T cell responses were detected ex vivo in all infected individuals and amplified, on average, 27-fold following in vitro expansion. In contrast, no HIV-1-specific T cell responses were detected in any of the EU partners ex vivo or following in vitro expansion. These data demonstrate that the detection of HIV-1-specific T cell immunity in EU individuals is not universal and that alternative mechanisms may account for protection in these individuals.

Exploring the condom gap: is supply or demand the limiting factor - condom access and use in an urban and a rural setting in Kilifi district, Kenya

OBJECTIVE

to explore the extent of the condom gap, investigating the relative roles of supply-side and demand-side factors in determining condom use.

DESIGN

GPS mapping of condom outlets, and population-based survey.

METHODS

an urban and a rural site were selected within the Epidemiological and Demographic Surveillance Site in Kilifi district, Kenya. Potential condom outlets (n = 281) were mapped and surveyed, and questionnaires on condom access and use (n = 630) were administered to a random sample of men and women aged 15-49. Multivariate logistic regression was performed to assess the relative roles of supply-side and demand-side barriers on condom use.

RESULTS

the median straight-line distance to free condoms was 18-fold higher in the rural versus urban site. Among sexually active respondents, 42% had ever used a condom, and 23% had used a condom over the past 12 months, with lower levels among rural versus urban respondents (P < 0.05). The mean number of condoms used was 2.2/person per year among all sexually active individuals (condom users and nonusers), amounting to 8.2% protected sex acts/person per year. The adjusted odds of condom use (past 12 months) were 8.1 times greater among individuals experiencing no supply-side or demand-side barriers, compared with individuals experiencing both types of barriers. Despite low levels of usage and the presence of supply-side and demand-side barriers, reported unmet need for condoms was low.

CONCLUSIONS

there is an urgent need for renewed condom promotion efforts aimed at building demand, in addition to improving physical access, in resource-limited settings with generalized HIV epidemics in sub-Saharan Africa.

Biological validation of self-reported condom use among sex workers in Guinea

Self-reported condom use may be prone to social desirability bias. Our aim was to assess the validity of self-reported condom use in a population of female sex workers using prostate specific antigen (PSA) as a gold standard biomarker of recent unprotected vaginal intercourse. We collected data on 223 sex-workers in Conakry, Guinea in order to assess the sensitivity and specificity of self-reported condom use as well as to examine the predictors of discordance between self-report and PSA presence. PSA was detected in 38.4% of samples. Sensitivity of self-reported condom use was 14.6% and its specificity was 94.7%. Self-perceived high risk of HIV infection was the only significant independent predictor of misreported condom use. PSA could be useful to validate self-reported condom use in surveys and to allow a better understanding of factors associated with social desirability in sexual behaviour reporting.

Decreased sexual risk behavior in the era of HAART among HIV-infected urban and rural South Africans attending primary care clinics

OBJECTIVE

In light of increasing access to HAART in sub-Saharan Africa, we conducted a longitudinal study to assess the impact of HAART on sexual risk behaviors among HIV-infected South Africans in urban and rural primary care clinics.

DESIGN

Prospective observational cohort.

METHODS

We conducted a cohort study at rural and urban primary care HIV clinics in South Africa consisting of 1544 men and 4719 women enrolled from 2003 to 2010, representing 19703 clinic visits. The primary outcomes were being sexually active, unprotected sex, and more than one sex partner and were evaluated at 6 monthly intervals. Generalized estimated equations assessed the impact of HAART on sexual risk behaviors.

RESULTS

Among 6263 HIV-infected men and women, over a third (37.2%) initiated HAART during study follow-up. In comparison to pre-HAART follow-up, visits while receiving HAART were associated with a decrease in those reporting being sexually active [adjusted odds ratio: 0.86 (95% confidence interval: 0.78-0.95)]. Unprotected sex and having more than one sex partner were reduced at visits following HAART initiation compared to pre-HAART visits [adjusted odds ratio: 0.40 (95% confidence interval: 0.34-0.46) and adjusted odds ratio: 0.20 (95% confidence interval: 0.14-0.29), respectively].

CONCLUSION

Sexual risk behavior significantly decreased following HAART initiation among HIV-infected South African men and women in primary care programs. The further expansion of antiretroviral treatment programs could enhance HIV prevention efforts in Africa.

High uptake of home-based, district-wide, HIV counseling and testing in Uganda

More than 80% of the people infected with HIV in low-income countries of sub-Saharan Africa do not know their HIV serostatus. Innovative measures of increasing access to HIV counseling and testing (HCT) are urgently needed so as to improve care and prevention. We implemented a home-based HCT program in Bushenyi District from September 2004 to March 2007, in Uganda where approximately 90% of people aged older than 14 years had never tested for HIV to gauge whether it was acceptable and increased uptake of HCT. Twenty-nine teams comprising a counselor and a laboratory assistant systematically visited homes offering HCT for all people older than 14 years of age and at-risk children (mother deceased or HIV infected) using a rapid HIV testing three-test algorithm. HIV-infected people received cotrimoxazole prophylaxis, were supplied with long-lasting insecticide-treated bed nets and equipment for treatment of drinking water at home, and were referred for assessment for antiretroviral therapy. The program reached 92,984 (63%) of all the homes in the district. Of these, 32,3621 people were eligible for HCT, and 28,2857 (87%) were present at home and were offered pretest counseling. A total of 264,966 (94%) accepted testing and received their results, of whom 11,359 (4.3%) were HIV-infected. Ninety percent of those testing had never tested before. The cost of testing was $7.83 per previously untested client. Ninety-seven percent of HIV-infected people initiated cotrimoxazole prophylaxis, 74% received bed nets, 70% received water treatment equipment, and 11% began antiretroviral therapy. Forty-four percent of people who were in an HIV-discordant relationship were infected. These results demonstrate that home-based HCT was well-accepted, feasible, and effective in identifying HIV-infected individuals who did not know their HIV status in rural Uganda.

Pregnancy and HIV transmission among HIV-discordant couples in a clinical trial in Kisumu, Kenya

OBJECTIVES

A large proportion of new HIV infections in sub-Saharan Africa occur in stable HIV-discordant partnerships. In some couples, the strong desire to conceive a child may lead to risky behaviour despite knowledge of discordant serostatus. Our objective was to compare HIV transmission between discordant couples who did and did not conceive during participation in a clinical trial.

METHODS

Five hundred and thirty-two HIV-discordant couples were followed for up to 2 years in Kisumu, Kenya as part of the Partners in Prevention HSV/HIV Transmission Study. Quarterly HIV-1 antibody and urine pregnancy test results were analysed.

RESULTS

Forty-one HIV-1 seroconversions occurred over 888 person-years of follow-up, resulting in an annual incidence of 4.6/100 person-years. Twenty seroconversions occurred among 186 HIV-1-uninfected individuals in partnerships in which pregnancy occurred (10.8% of HIV-1-negative partners in this group seroconverted), in comparison to 21 seroconversions among 353 uninfected individuals in partnerships in which pregnancy did not occur (5.9% of HIV-1-negative partners seroconverted), resulting in a relative risk of 1.8 [95% confidence interval (CI) 1.01-3.26; P<0.05].

CONCLUSIONS

Pregnancy was associated with an increased risk of HIV seroconversion in discordant couples. These data suggest that the intention to conceive among HIV discordant couples may be contributing to the epidemic.

Predicting pregnancy in HIV-1-discordant couples

This study examines the incidence and predictors of pregnancy in HIV-1-discordant couples from Nairobi, Kenya. Women from 454 discordant couples were followed for up to 2 years. One-year cumulative incidence of pregnancy was 9.7%. Pregnancy rates did not differ significantly between HIV-1-infected and uninfected women (HR = 1.46). The majority of pregnancies occurred among women < 30 years old reporting a desire for future children (1-year incidence 22.2%). Pregnancy rates may be high among discordant couples, indicating desire for children may override concerns of HIV-1 transmission and increase unprotected sex, and highlighting the need to make conception safer.

HIV transmission risk among serodiscordant couples: a retrospective study of former plasma donors in Henan, China

OBJECTIVES: To estimate the HIV incidence and assess the behavioral, clinical, and quality-of-life risk factors for HIV transmission among serodiscordant couples from Henan Province, China. METHODS: Between January 2006 and December 2008, initially seronegative spouses were tested for HIV at six month intervals. Retrospectively identified subjects were interviewed through face-to-face questionnaire. Cox proportional-hazards model was used to assess the relationship between risk factors and HIV seroconversion. RESULTS: Out of 1927 couples, 84 (4.3%) seroconversions occurred, representing a seroconversion rate of 1.71 per 100 person-years. Seroconversion rates increased over time. Not always using condoms (RR=8.42; 95% CI, 4.83-14.67), sexual activity ≥ 4 times per month (RR=5.24; 95% CI, 2.55-10.77), not switching anti-retroviral treatment regimen (RR=1.99; 95% CI, 0.85-4.65), and a quality of life score <12 on the psychological domain (RR=2.33; 95% CI, 1.21-4.48) were associated with increased risk of seroconversion. Seventy one percent of index spouses were on ART. There was no association between rate of HIV seroconversion and last recorded CD4 cell count level of the index spouse. CONCLUSIONS: Effective HIV prevention interventions targeting discordant couples should focus on sustaining health education, increasing psychosocial support services, and increasing medication adherence monitoring.

Cost-effectiveness of HIV testing referral strategies among tuberculosis patients in India

Background

Indian guidelines recommend routine referral for HIV testing of all tuberculosis (TB) patients in the nine states with the highest HIV prevalence, and selective referral for testing elsewhere. We assessed the clinical impact and cost-effectiveness of alternative HIV testing referral strategies among TB patients in India.

Methods and Findings

We utilized a computer model of HIV and TB disease to project outcomes for patients with active TB in India. We compared life expectancy, cost, and cost-effectiveness for three HIV testing referral strategies: 1) selective referral for HIV testing of those with increased HIV risk, 2) routine referral of patients in the nine highest HIV prevalence states with selective referral elsewhere (current standard), and 3) routine referral of all patients for HIV testing. TB-related data were from the World Health Organization. HIV prevalence among TB patients was 9.0% in the highest prevalence states, 2.9% in the other states, and 4.9% overall. The selective referral strategy, beginning from age 33.50 years, had a projected discounted life expectancy of 16.88 years and a mean lifetime HIV/TB treatment cost of US$100. The current standard increased mean life expectancy to 16.90 years with additional per-person cost of US$10; the incremental cost-effectiveness ratio was US$650/year of life saved (YLS) compared to selective referral. Routine referral of all patients for HIV testing increased life expectancy to 16.91 years, with an incremental cost-effectiveness ratio of US$730/YLS compared to the current standard. For HIV-infected patients cured of TB, receiving antiretroviral therapy increased survival from 4.71 to 13.87 years. Results were most sensitive to the HIV prevalence and the cost of second-line antiretroviral therapy.

Conclusions

Referral of all patients with active TB in India for HIV testing will be both effective and cost-effective. While effective implementation of this strategy would require investment, routine, voluntary HIV testing of TB patients in India should be recommended.

An overview of the relative risks of different sexual behaviours on HIV transmission

PURPOSE OF REVIEW

Sexual intercourse represents the majority of HIV transmission and is preventable. Overall, the risk of HIV transmission following a single sexual exposure is low especially in comparison with other sexually transmitted infections (STIs), with estimates of the average probability of male-to-female HIV transmission only 0.0005-0.0026 per coital act. The risk of acquiring HIV from a single contact varies enormously and is dependant upon the infectiousness of the HIV-positive individual and the susceptibility to HIV of their sexual partner.

RECENT FINDINGS

Of concern, unprotected sex among men who have sex with men (MSM) has increased in recent years and HIV incidence in both MSM and heterosexuals remains a considerable public health concern. Sexual practices and health optimism about HIV have changed, which have significantly impacted HIV risk behaviour.

SUMMARY

In this review article we summarize the current evidence regarding the observed relative risks of HIV transmission for each different types of sex act, relationship type and the strategies that have been tested to interrupt transmission.

Female disclosure of HIV-positive serostatus to sex partners: a two-city study

The aims of this article are (1) to describe the prevalence of disclosure of HIV serostatus to sex partners among a racially/ethnically diverse sample of HIV-positive women living in Hawai'i and Seattle, Washington; and (2) to examine factors related to disclosure and condom use with those sex partners. HIV-positive women have difficulties consistently disclosing serostatus to sex partners and using condoms. Little is known about the disclosure practices of women from Hawai'i or Seattle. A cross-sectional design with convenience and snowball sampling was used, and up to three recent sex partner experiences were assessed among the HIV-positive participants (N = 84). A total of 133 recent sex partners were reported, with disclosure and condom use frequencies of 75.2 and 59.9%, respectively. Women who knew when it was safe to disclose were more likely to disclose. Women who disclosed to recent sex partners were less likely to use condoms, while those in casual/anonymous partnerships were more likely to use condoms. Hawaiian/part Hawaiian women had the lowest proportion of condom use. Health care personnel should routinely discuss disclosure and sexual transmission risk behaviors with seropositive women and offer strategies to enhance condom use, especially among those in committed partnerships. Culturally tailored interventions focused on strengthening efficacy beliefs for disclosure and condom use in Native Hawaiians are needed.

The influence of informed consent content on study participants' contraceptive knowledge and concerns

Little is known about how the information presented in the informed consent process influences study outcomes among participants. This study examines the influence of informed consent content on reported baseline contraceptive knowledge and concerns among two groups of HIV-serodiscordant and seroconcordant HIV-positive couples enrolled in research projects at an HIV research center in Lusaka, Zambia. We found significant differences in the reporting of contraceptive knowledge and concerns between couples viewing consent materials that included detailed information about contraception and those viewing consent materials that lacked the detailed information. We conclude that the design of informed consent materials should strike a balance between ensuring that participants give truly informed consent and educating participants in ways that do not compromise the assessment of the impact of behavioral interventions.

Periconception pre-exposure prophylaxis to prevent HIV transmission: benefits, risks, and challenges to implementation

HIV-serodiscordant couples face complicated choices between fulfilling reproductive desire and risking HIV transmission to their partners and children. Sexual HIV transmission can be dramatically reduced through artificial insemination and sperm washing; however, most couples cannot access these resources. We propose that periconception pre-exposure prophylaxis (PrEP) could offer an important, complementary therapy to harm reduction counseling programs that aim to decrease HIV transmission for couples who choose to conceive. In this paper, we describe the potential benefits of periconception PrEP and define critical points of clarification prior to implementation of PrEP as part of a reproductive health program. We consider sexual transmission risk, current risk reduction options, PrEP efficacy, cost, adherence, resistance, fetal toxicity, and impact of PrEP counseling on entry into health services. We address PrEP in the context of other periconception HIV-prevention strategies, including antiretroviral treatment of the HIV-infected partner. We conclude that, should PrEP prove safe and efficacious in ongoing trials, periconception PrEP may offer a useful approach to minimize risk of HIV transmission for individuals of reproductive age in HIV-endemic countries.

Factors associated with HIV testing among public sector clinic attendees in Johannesburg, South Africa

Uptake of VCT remains low in many sub-Saharan African countries. Men and women aged 15 and older were recruited from a family planning, STI, and VCT clinic in inner-city Johannesburg between 2004 and 2005 to take part in a cross-sectional survey on HIV testing (n = 198). Fourty-eight percent of participants reported previously testing for HIV and, of these, 86.9% reported disclosing their status to their sex partner. In multivariable analyses, individuals whose partners had been tested for HIV were more likely to have tested (AOR 2.92; 95% CI: 1.38-6.20). In addition, those who reported greater blame/shame attitudes towards people living with HIV/AIDS were less likely to have tested (AOR 0.35; 95% CI: 0.16-0.77) while those reporting more equitable attitudes towards people living with HIV/AIDS were more likely to have tested (AOR 2.87; 95% CI: 1.20-6.86). Promotion of and increased access to couples HIV testing should be made available within the South African context.

Correlates of HIV/STD testing and willingness to test among rural-to-urban migrants in China

This study investigates socio-demographic, behavioral, psychological, and structural factors associated with self-reported HIV/STD testing and willingness to test among 1,938 Chinese migrants. Overall, 6% and 14% of participants had ever been tested for HIV and STD, respectively. The results of multivariate analyses indicate that working at entertainment sectors, engaging in commercial sex, and utilization of health care were positively associated with both HIV and STD testing. Younger age, selling blood, perceived peer sexual risk involvement, and satisfaction with life were associated with HIV testing only. Female gender, early sexual debut, multiple sexual partners, and perceived vulnerability to HIV/STD were associated with STD testing only. Male gender, having premarital sex, perceived higher severity of and vulnerability to HIV/STD, and utilization of health care were associated with willingness to be tested for both HIV and STD. Interventions designed to raise the perception of vulnerability to HIV/STD and to improve access to and utilization of health care may be effective in encouraging more HIV testing in this vulnerable population.

A mixed methods and triangulation model for increasing the accuracy of adherence and sexual behaviour data: the Microbicides Development Programme

BACKGROUND

The collection of accurate data on adherence and sexual behaviour is crucial in microbicide (and other HIV-related) research. In the absence of a "gold standard" the collection of such data relies largely on participant self-reporting. After reviewing available methods, this paper describes a mixed method/triangulation model for generating more accurate data on adherence and sexual behaviour in a multi-centre vaginal microbicide clinical trial. In a companion paper some of the results from this model are presented [1].

METHODOLOGY/PRINCIPAL FINDINGS

Data were collected from a random subsample of 725 women (7.7% of the trial population) using structured interviews, coital diaries, in-depth interviews, counting returned gel applicators, focus group discussions, and ethnography. The core of the model was a customised, semi-structured in-depth interview. There were two levels of triangulation: first, discrepancies between data from the questionnaires, diaries, in-depth interviews and applicator returns were identified, discussed with participants and, to a large extent, resolved; second, results from individual participants were related to more general data emerging from the focus group discussions and ethnography. A democratic and equitable collaboration between clinical trialists and qualitative social scientists facilitated the success of the model, as did the preparatory studies preceding the trial. The process revealed some of the underlying assumptions and routinised practices in "clinical trial culture" that are potentially detrimental to the collection of accurate data, as well as some of the shortcomings of large qualitative studies, and pointed to some potential solutions.

CONCLUSIONS/SIGNIFICANCE

The integration of qualitative social science and the use of mixed methods and triangulation in clinical trials are feasible, and can reveal (and resolve) inaccuracies in data on adherence and sensitive behaviours, as well as illuminating aspects of "trial culture" that may also affect data accuracy.

Integrating HIV screening into routine health care in resource-limited settings

The United Nations is committed to achieving universal access to human immunodeficiency virus (HIV) care, treatment, and prevention. Although the gateway to HIV care and secondary prevention is knowledge of serostatus, use of voluntary counseling and testing in resource-limited settings with the highest burden of HIV infection and AIDS has been limited. On the basis of evidence of increased patient uptake and the opportunity to avoid missed HIV testing opportunities in health care facilities, in 2007, the World Health Organization recommended provider-initiated HIV testing as a standard part of medical care in settings with generalized HIV epidemics. Although provider-initiated testing has shown promise, optimal implementation strategies that ensure broad coverage, while preserving human rights, remain an active area of research. We review the benefits of knowledge of HIV serostatus and evidence from multiple countries surrounding the successes and pitfalls of provider-initiated testing in health care and home-based settings.

The limited effect of knowing they are HIV-positive on the sexual and reproductive experiences and intentions of infected adolescents in Uganda

This paper compares the sexual and reproductive experiences and intentions of those adolescents aged 15-19 years in Uganda who are perinatally infected with HIV and know their sero-status with those of adolescents who do not know their sero-status. The analysis comprises a simple comparison of means and proportions, together with the relevant tests of significance, as well as estimation of Cox proportional hazards and random-effects logit models. The findings show that the two groups of adolescents do not differ significantly in terms of timing of sexual debut and whether they intend to have children in the future. However, adolescents who are HIV-positive and know their status are significantly more likely to use a modern method of contraception, including condoms. Nonetheless, the level of condom use among these adolescents is still limited (less than half of those sexually active) and inconsistent (less than half of those in relationships reported always using a condom).

Reviewing the evidence on effectiveness and cost-effectiveness of HIV prevention strategies in Thailand

Background

Following universal access to antiretroviral therapy in Thailand, evidence from National AIDS Spending Assessment indicates a decreasing proportion of expenditure on prevention interventions. To prompt policymakers to revitalize HIV prevention, this study identifies a comprehensive list of HIV/AIDs preventive interventions that are likely to be effective and cost-effective in Thailand.

Methods

A systematic review of the national and international literature on HIV prevention strategies from 1997 to 2008 was undertaken. The outcomes used to consider the effectiveness of HIV prevention interventions were changes in HIV risk behaviour and HIV incidence. Economic evaluations that presented their results in terms of cost per HIV infection averted or cost per quality-adjusted life year (QALY) gained were also included. All studies were assessed against quality criteria.

Results

The findings demonstrated that school based-sex education plus life-skill programs, voluntary and routine HIV counselling and testing, male condoms, street outreach programs, needle and syringe programs, programs for the prevention of mother-to-child HIV transmission, male circumcision, screening blood products and donated organs for HIV, and increased alcohol tax were all effective in reducing HIV infection among target populations in a cost-effective manner.

Conclusion

We found very limited local evidence regarding the effectiveness of HIV interventions amongst specific high risk populations. This underlines the urgent need to prioritise health research resources to assess the effectiveness and cost-effectiveness of HIV interventions aimed at reducing HIV infection among high risk groups in Thailand.

Increasing access to HIV counseling and testing through mobile services in Kenya: strategies, utilization, and cost-effectiveness

INTRODUCTION

This study compares client volume, demographics, testing results, and costs of 3 "mobile" HIV counseling and testing (HCT) approaches with existing "stand-alone" HCT in Kenya. A retrospective cohort of 62,173 individuals receiving HCT between May 2005 and April 2006 was analyzed. Mobile HCT approaches assessed were community-site mobile HCT, semimobile container HCT, and fully mobile truck HCT. Data were obtained from project monitoring data, project accounts, and personnel interviews.

RESULTS

Mobile HCT reported a higher proportion of clients with no prior HIV test than stand-alone (88% vs. 58%). Stand-alone HCT reported a higher proportion of couples than mobile HCT (18% vs. 2%) and a higher proportion of discordant couples (12% vs. 4%). The incremental cost-effectiveness of adding mobile HCT to stand-alone services was $14.91 per client tested (vs. $26.75 for stand-alone HCT); $16.58 per previously untested client (vs. $43.69 for stand-alone HCT); and $157.21 per HIV-positive individual identified (vs. $189.14 for stand-alone HCT).

CONCLUSIONS

Adding mobile HCT to existing stand-alone HCT seems to be a cost-effective approach for expanding HCT coverage for reaching different target populations, including women and young people, and for identifying persons with newly diagnosed HIV infection for referral to treatment and care.

Comparing couples' and individual voluntary counseling and testing for HIV at antenatal clinics in Tanzania: a randomized trial

Voluntary counseling and testing (VCT) for couples (CVCT) is an important HIV-prevention effort in sub-Saharan Africa where a substantial proportion of HIV transmission occurs within stable partnerships. This study aimed to determine the acceptance and effectiveness of CVCT as compared to individual VCT (IVCT). 1,521 women attending three antenatal clinics in Dar es Salaam were randomized to receive IVCT during that visit or CVCT with their husbands at a subsequent visit. The proportion of women receiving test results in the CVCT arm was significantly lower than in the IVCT arm (39 vs. 71%). HIV prevalence overall was 10%. In a subgroup analysis of HIV-positive women, those who received CVCT were more likely to use preventive measures against transmission (90 vs. 60%) and to receive nevirapine for themselves (55 vs. 24%) and their infants (55 vs. 22%) as compared to women randomized to IVCT. Uptake of CVCT is low in the antenatal clinic setting. Community mobilization and couple-friendly clinics are needed to promote CVCT.

Patterns of self-reported behaviour change associated with receiving voluntary counselling and testing in a longitudinal study from Manicaland, Zimbabwe

Voluntary counselling and testing (VCT) is promoted as a potential HIV prevention measure. We describe trends in uptake of VCT for HIV, and patterns of subsequent behaviour change associated with receiving VCT in a population-based open cohort in Manicaland, Zimbabwe. The relationship between receipt of VCT and subsequent reported behaviour was analysed using generalized linear models with random effects. At the third survey, 8.6% of participants (1,079/12,533), had previously received VCT. Women who received VCT, both those positive and negative, reduced their reported number of new partners. Among those testing positive, this risk reduction was enhanced with time since testing. Among men, no behavioural risk reduction associated with VCT was observed. Significant increases in consistent condom use, with regular or non-regular partners, following VCT, were not observed. This study suggests that, among women, particularly those who are infected, behavioural risk reduction does occur following VCT.

Behavioural interventions for HIV positive prevention in developing countries: a systematic review and meta-analysis

OBJECTIVE

To assess the evidence for a differential effect of positive prevention interventions among individuals infected and not infected with human immunodeficiency virus (HIV) in developing countries, and to assess the effectiveness of interventions targeted specifically at people living with HIV.

METHODS

We conducted a systematic review and meta-analysis of papers on positive prevention behavioural interventions in developing countries published between January 1990 and December 2006. Standardized methods of searching and data abstraction were used. Pooled effect sizes were calculated using random effects models.

FINDINGS

Nineteen studies met the inclusion criteria. In meta-analysis, behavioural interventions had a stronger impact on condom use among HIV-positive (HIV+) individuals (odds ratio, OR: 3.61; 95% confidence interval, CI: 2.61-4.99) than among HIV-negative individuals (OR: 1.32; 95% CI: 0.77-2.26). Interventions specifically targeting HIV+ individuals also showed a positive effect on condom use (OR: 7.84; 95% CI: 2.82-21.79), which was particularly strong among HIV-serodiscordant couples (OR: 67.38; 95% CI: 36.17-125.52). Interventions included in this review were limited both in scope (most were HIV counselling and testing interventions) and in target populations (most were conducted among heterosexual adults or HIV-serodiscordant couples).

CONCLUSION

Current evidence suggests that interventions targeting people living with HIV in developing countries increase condom use, especially among HIV-serodiscordant couples. Comprehensive positive prevention interventions targeting diverse populations and covering a range of intervention modalities are needed to keep HIV+ individuals physically and mentally healthy, prevent transmission of HIV infection and increase the agency and involvement of people living with HIV.

Do behavioural differences help to explain variations in HIV prevalence in adolescents in sub-Saharan Africa?

OBJECTIVE

To compare adolescent risk factors for HIV infection in two countries with high adolescent HIV prevalence and two lower prevalence countries with the aim of identifying risk factors that may help explain differences in adolescent HIV prevalence.

METHODS

Data were available from two nationally representative surveys (South Africa, Zimbabwe), two behavioural intervention trials (Tanzania, Zimbabwe) and one population-based cohort (Uganda). Data on variables known or postulated to be risk factors for HIV infection were compared.

RESULTS

Few risk behaviours were markedly more common in the high HIV prevalence populations. Risk factors more common in high HIV prevalence settings were genital ulcers and discharge, and women were more likely to report older male partners.

DISCUSSION

Age mixing may be an important determinate of HIV prevalence in adolescents. Potential reasons for the general lack of association between other adolescent risk factors and adolescent HIV prevalence include adult HIV prevalence, misreported behaviour, different survey methods and other unmeasured adolescent behaviours. If adult factors dominate adolescent HIV risk, it would help explain the failure of behavioural interventions targeted at adolescents and suggests future interventions should include adults.

Nonpathogenic simian immunodeficiency virus infection of sooty mangabeys is not associated with high levels of autologous neutralizing antibodies

Simian immunodeficiency virus (SIV) infection of natural-host species, such as sooty mangabeys (SMs), is characterized by a high level of viral replication and a low level of generalized immune activation, despite evidence of an adaptive immune response. Here the ability of SIV-infected SMs to mount neutralizing antibodies (Nab) against autologous virus was compared to that of human immunodeficiency virus type 1 (HIV-1) subtype C-infected subjects. While high levels of Nab were observed in HIV-1 infection, samples obtained at comparable time points from SM exhibited relatively low titers of autologous Nab. Nevertheless, SM plasma with higher Nab titers also contained elevated peripheral CD4(+) T-cell levels, suggesting a potential immunologic benefit for SMs. These data indicate that AIDS resistance in these primates is not due to high Nab titers and raise the possibility that low levels of Nab might be an inherent feature of natural-host SIV infections.

Perceptions of couple HIV counseling and testing in Botswana: a stakeholder analysis

OBJECTIVE

To explore stakeholder's perceptions of Couples HIV Counseling and Testing (CHCT) as opposed to individual testing and potential couples' preferences for CHCT promotion and service provision.

METHODS

Study was conducted as formative research for a phase III clinical trial of Herpes (HSV-2) suppression to prevent HIV transmission among HIV discordant couples. We used non-probability purposive sampling and snowballing techniques to identify study participants. Data were collected using key informant interviews and focus group discussions. Systematic textual data analysis was used. Two independent coders coded and compared their codes for agreement. Data was categorized by emerging themes.

RESULTS

The general themes from both key informant interviews and focus group discussions were a preference for CHCT as opposed to individual counseling in HIV prevention and the need for a client-centered approach to promotion and provision of couple HIV testing services.

CONCLUSION

CHCT is important in HIV prevention and should be integrated in existing HIV testing programs. The study also demonstrates the challenges of HIV status disclosure and discordance among sexual partners who test as individuals.

PRACTICE IMPLICATIONS

Current low HIV status disclosure rates imply that reducing HIV incidence rates will require integrating CHCT into current testing programs. Increasing CHCT uptake however, requires improving access, training providers and addressing social, cultural, political and logistical barriers.

Human leukocyte antigens and HIV type 1 viral load in early and chronic infection: predominance of evolving relationships

BACKGROUND

During untreated, chronic HIV-1 infection, plasma viral load (VL) is a relatively stable quantitative trait that has clinical and epidemiological implications. Immunogenetic research has established various human genetic factors, especially human leukocyte antigen (HLA) variants, as independent determinants of VL set-point.

METHODOLOGY/PRINCIPAL FINDINGS

To identify and clarify HLA alleles that are associated with either transient or durable immune control of HIV-1 infection, we evaluated the relationships of HLA class I and class II alleles with VL among 563 seroprevalent Zambians (SPs) who were seropositive at enrollment and 221 seroconverters (SCs) who became seropositive during quarterly follow-up visits. After statistical adjustments for non-genetic factors (sex and age), two unfavorable alleles (A*3601 and DRB1*0102) were independently associated with high VL in SPs (p<0.01) but not in SCs. In contrast, favorable HLA variants, mainly A*74, B*13, B*57 (or Cw*18), and one HLA-A and HLA-C combination (A*30+Cw*03), dominated in SCs; their independent associations with low VL were reflected in regression beta estimates that ranged from -0.47+/-0.23 to -0.92+/-0.32 log(10) in SCs (p<0.05). Except for Cw*18, all favorable variants had diminishing or vanishing association with VL in SPs (p

CONCLUSIONS/SIGNIFICANCE

Overall, each of the three HLA class I genes had at least one allele that might contribute to effective immune control, especially during the early course of HIV-1 infection. These observations can provide a useful framework for ongoing analyses of viral mutations induced by protective immune responses.

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Key Words Collapse

MESH Headings

• Adult
• Age Factors
• Alleles
• Chronic Disease
• Female
• Genetic Variation
• HIV Seropositivity
• HIV-1/metabolism
• Histocompatibility Antigens Class I/immunology
• Histocompatibility Antigens Class II/immunology
• Humans
• Male
• Middle Aged
• Models, Genetic
• Mutation
• Regression Analysis
• Seroepidemiologic Studies
• Viral Load
• Zambia

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Grants

• AI064060 NIAID NIH HHS
• R01 AI064060 NIAID NIH HHS
• K02 AI076123 NIAID NIH HHS
• AI040951 NIAID NIH HHS
• AI071906 NIAID NIH HHS
• AI76123 NIAID NIH HHS
• R01 AI071906 NIAID NIH HHS

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Affiliation(s)

Jianming Tang Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, United States of America
Rakhi Malhotra Department of Epidemiology, University of Alabama at Birmingham, Birmingham, Alabama, United States of America
Wei Song Department of Epidemiology, University of Alabama at Birmingham, Birmingham, Alabama, United States of America
Ilene Brill Department of Epidemiology, University of Alabama at Birmingham, Birmingham, Alabama, United States of America
Liangyuan Hu Department of Epidemiology, University of Alabama at Birmingham, Birmingham, Alabama, United States of America
Paul K. Farmer Vaccine Research Center, Emory University, Atlanta, Georgia, United States of America
Joseph Mulenga Rwanda-Zambia HIV-1 Research Group, Lusaka, Zambia
Susan Allen Rwanda-Zambia HIV-1 Research Group, Lusaka, Zambia Department of Pathology and Laboratory Medicine, Emory University, Atlanta, Georgia, United States of America
Eric Hunter Vaccine Research Center, Emory University, Atlanta, Georgia, United States of America
Richard A. Kaslow Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, United States of America Department of Epidemiology, University of Alabama at Birmingham, Birmingham, Alabama, United States of America

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Collaborators Collapse

Beyond monogamy: opportunities to further reduce risk for HIV infection among married Zimbabwean women with only one lifetime partner

The main objective of this paper was to identify HIV risk factors at the individual, partner, and partnership levels among married, lifetime monogamous women in a nationally representative sample of Zimbabweans aged 15-29 years. Cross-sectional data were collected through individual survey interviews among 1,286 women who provided blood for HIV testing. The HIV prevalence among these women was high (21.8%). HIV risk increased with female age, within-couple age difference of more than 5 years, the husband having children with other women, and the respondent being 'extremely likely' to discuss monogamy in the next 3 months with her husband. The latter suggests that women were attempting to communicate their concerns while unaware that they were already HIV positive. HIV risk largely appears related to the partner's past and present sexual behavior, resulting in limited ability for married women to protect themselves from infection. Overall, lifetime monogamy offers insufficient protection for women.

HIV among plasma donors and other high-risk groups in Henan, China

OBJECTIVE

To describe the characteristics and changes of HIV/AIDS epidemic in different areas and high-risk populations in Henan, China.

METHODS

Serological surveys were conducted among former plasma donors (FPDs), female sex workers, drug users, sexually transmitted disease clinic attendees, men who have sex with men, and long-distance truck drivers in different areas of Henan Province. Data originated from the sentinel surveillance surveys conducted between 2004 and 2006, a special epidemiological study of HIV among FPDs in 2004 and the HIV/AIDS case-reporting system were analyzed.

RESULTS

By December 2006, a total of 35,232 HIV cases had been reported from 159 counties in Henan. HIV prevalence among FPDs was 8.6% (range: 0.09%-13.0%). Sentinel surveillance data collected between 2004 and 2006 indicated HIV prevalence from 0% to 0.80% in female sex workers; 0% to 0.86% in drug users; 0% to 1.39% in sexually transmitted disease clinic attendeess; 0% to 1.35% in long-distance truck drivers; and 0.88% to 2.67% in men who have sex with men.

CONCLUSIONS

HIV/AIDS epidemic in Henan is primarily centered among FPDs infected before 1996. Sexual transmission of HIV is increasing among other risk groups. Condom use and HIV testing and counseling need to be promoted to stop the spread of HIV.