Circumcision-related HIV risk and the unknown mechanism of effect in the male circumcision trials [letter].
Author: Brewer, D. D.; . = Potterat JJ; Roberts JM Jr, and Brody S.
Source: Annals of Epidemiology. 2007 Nov; 17(11):928-929.
Abstract: We welcome Westreich and colleagues' and Adams and colleagues' comments on our article, in which we reported that circumcised male and female adolescents and virgins in Kenya, Lesotho, and Tanzania were consistently and substantially more likely to be HIV infected than their uncircumcised counterparts. Moreover, we found that this relationship inverts in adults, such that circumcised adult men and women are less likely to be infected than uncircumcised adults. Westreich and colleagues and Adams and colleagues raise objections to our results that suggest HIV transmission occurs through circumcision practices in eastern and southern Africa. Specifically, they argue that our measurement of virginity and the number of HIV-infected virgins have probably biased our results. In our analyses, the positive association between circumcision and HIV infection in adolescents remained unchanged after statistically adjusting for self-reported sexual experience. Thus, there is no evidence that underreporting of sexual experience would affect the interpretation of the positive relationship between circumcision and HIV infection in virgins or sexually experienced youth. Indeed, the measurement of sexual behavior is entirely irrelevant to the positive association between circumcision and HIV infection in Kenyan, Lesothoan, and Tanzanian adolescents, regardless of virginity status. We also found that adolescent males who denied sexual experience were as likely or slightly more likely to be infected as those who acknowledged it. (excerpt)
Effect of CCR2 chemokine receptor polymorphism on HIV type 1 mother-to-child transmission and child survival in Western Kenya.
Author: Brouwer, K. C.; Yang, C.; Parekh, S.; Mirel, L. B.; Shi, Y. P.; Otieno, J.; Lal, A. A., and Lal, R. B.
Source: AIDS Res Hum Retroviruses. 2005 May; 21(5):358-62.
Abstract: The effect of CCR2 polymorphism on HIV-1 mother-to-child transmission and disease progression has not been explored in depth within Africa. As the CCR2-64I variant of this putative HIV coreceptor has been associated with slower progression to AIDS in adults, the current study was undertaken to examine the relationship between CCR2 polymorphism and HIV-1 perinatal transmission and child survival in western Kenya. CCR2 genotype was determined for 445 HIV-seropositive mothers and their infants. The CCR2-64I allele frequency of both mothers and children did not differ by HIV-1 transmission status, regardless of maternal viral load, viral subtype, immune status, or placental malaria status. For infants who acquired HIV perinatally (n = 78), there was no association between CCR2 genotype and viral load upon infection or survival rate over the 2-year follow-up. Our results do not indicate an effect of CCR2-64I on perinatal HIV transmission and survival in Kenyan children.
Safety, acceptability, and tolerability of 3 topical microbicides among heterosexual Kenyan men.
Author: Bukusi, E. A.; Steele, M.; Cohen, C. R.; Nguti, R.; Maingi, C. W.; Thomas, K. K., and Holmes, K. K.
Source: J Acquir Immune Defic Syndr. 2007 Apr 1; 44(4):423-8.
Abstract: Objectives:
To compare the acceptability, tolerability, and safety of 3 topical microbicide formulations (62% ethyl alcohol in emollient gel and 0.1% and 0.4% benzalkonium chloride on a sanitary wipe) for use on male genitalia.
Design:
This triple-randomized crossover study among men attending a sexually transmitted disease (STD) clinic in Nairobi, Kenya assigned individuals without clinical evidence of an STD to apply products to the penis in a predetermined random order, each for a 2-week period with a 1-week washout period between each product. Men recorded side effects and were examined for adverse events.
Results:
Of 39 participants, 33 (84%) completed 6 clinic visits plus 3 home visits by community health workers. Participants reported use of 62% ethanol gel and 0.1% and 0.4% benzalkonium on 99%, 99%, and 96% of daily scheduled applications; 99%, 98%, and 97% of preintercourse applications, and 99%, 94%, and 98% of postintercourse applications. All participants said they would recommend all 3 products to a friend; 72% preferred the 62% ethanol gel, 17% the 0.1% benzalkonium, and 11% the 0.4% benzalkonium. One person developed objective signs of a genital ulcer after 14 days of 0.4% benzalkonium wipe use.
Conclusions:
Two of the 3 topical microbicides had minimal reported adverse effects, and no adverse effects were observed during use of the ethanol gel, which was preferred by most men.
Identification of differentially expressed proteins in the cervical mucosa of HIV-1-resistant sex workers.
Author: Burgener, A.; Boutilier, J.; Wachihi, C.; Kimani, J.; Carpenter, M.; Westmacott, G.; Cheng, K.; Ball, T. B., and Plummer, F.
Source: J Proteome Res. 2008 Oct; 7(10):4446-54.
Abstract: Novel tools are necessary to understand mechanisms of altered susceptibility to HIV-1 infection in women of the Pumwani Sex Worker cohort, Kenya. In this cohort, more than 140 of the 2000 participants have been characterized to be relatively resistant to HIV-1 infection. Given that sexual transmission of HIV-1 occurs through mucosal surfaces such as that in the cervicovaginal environment, our hypothesis is that innate immune factors in the genital tract may play a role in HIV-1 infection resistance. Understanding this mechanism may help develop microbicides and/or vaccines against HIV-1. A quantitative proteomics technique (2D-DIGE: two-dimensional difference in-gel electrophoresis) was used to examine cervical mucosa of HIV-1 resistant women ( n = 10) for biomarkers of HIV-1 resistance. Over 15 proteins were found to be differentially expressed between HIV-1-resistant women and control groups ( n = 29), some which show a greater than 8-fold change. HIV-1-resistant women overexpressed several antiproteases, including those from the serpin B family, and also cystatin A, a known anti-HIV-1 factor. Immunoblotting for a selection of the identified proteins confirmed the DIGE volume differences. Validation of these results on a larger sample of individuals will provide further evidence these biomarkers are associated with HIV-1 resistance and could help aid in the development of effective microbicides against HIV-
Our sexuality, our stores: Experiences of HIV-positive women in Kenya.
Author: Burris, M. A. and . = Wanjala M.
Source: Exchange on HIV / AIDS, Sexuality and Gender. 2007; (3):13-15.
Abstract: In July 2006, a group of HIV-positive Kenyan women from Women Fighting AIDS in Kenya (WOFAK), Society for Orphans Against AIDS (SOAN), and Kibera Community Self-Help Programme (KICOSHEP) began meeting at the Trust for Indigenous Culture and Health (TICAH) in Nairobi, Kenya to talk about their needs. Soon, they realized that the issue of sexuality was central to their lives and that they yearned to learn more about it and discuss it with other women. This initiative has now evolved into the establishment of collectives of women and men who are meeting regularly to talk about sex. Two women involved in these collectives share their experiences in this article. (author's)
Correlation of CD4 counts and CD4/CD8 ratio with HIV-infection associated oral manifestations.
Author: Butt, F. M.; Vaghela, V. P., and Chindia, M. L.
Source: East Afr Med J. 2007 Aug; 84(8):383-8.
Abstract: Background:
The relationship between oral lesions arising from HIV infection and CD4/CD8 cell ratios is of relevance in clinical assessment of immune suppression.
Objective:
To correlate the prevalence of oral manifestations arising from HIV infection and the levels of CD4/CD8 cell ratios.
Design: A cross-sectional study.
Setting: Kenyatta National Hospital, Nairobi, Kenya.
Subjects:
Two hundred and seven HIV-infected patients in medical wards were recruited in the study.
Results:
Seventy eight (37.7%) were male and 129 (62.3%) female, with an age range of 18-73 years (mean=34.81 years). Oral manifestations encountered with highest prevalence in the oral cavity included: hyperplastic candidosis (labial mucosa) 15%, erythematous candidosis (gingival) 5%, angular cheilitis 32.4%, herpes simplex (corner of the mouth) 0.5%, persistent oral ulceration (labial mucosa) 0.5%, Parotid enlargement 2% and Kaposis sarcoma (hard/soft palate) 2.9%.
Conclusion:
The prevalence of oral manifestations was higher with low CD4 count <200 cell/mm3 and mean CD4/CD8<0.39(95%CI 0.32-0.48).
Integrating nutrition security with treatment of people living with HIV: lessons from Kenya.
Author: Byron, E.; Gillespie, S., and Nangami, M.
Source: Food Nutr Bull. 2008 Jun; 29(2):87-97.
Abstract: Background:
The increased caloric requirements of HIV-positive individuals, undesirable side effects of treatment that may be worsened by malnutrition (but alleviated by nutritional support), and associated declines in adherence and possible increased drug resistance are all justifications for developing better interventions to strengthen the nutrition security of individuals receiving antiretroviral treatment.
Objective:
To highlight key benefits and challenges relating to interventions aimed at strengthening the nutrition security of people living with HIV who are receiving antiretroviral treatment.
Methods:
Qualitative research was undertaken on a short-term nutrition intervention linked to the provision of free antiretroviral treatment for people living with HIV in western Kenya in late 2005 and early 2006.
Results:
Patients enrolled in the food program while on treatment regimens self-reported greater adherence to their medication, fewer side effects, and a greater ability to satisfy increased appetite. Most clients self-reported weight gain, recovery of physical strength, and the resumption of labor activities while enrolled in dual (food supplementation and treatment) programs. Such improvements were seen to catalyze increased support from family and community.
Conclusions:
These findings provide further empirical support to calls for a more holistic and comprehensive response to the coexistence of AIDS epidemics with chronic nutrition insecurity. Future work is needed to clarify ways of bridging the gap between short-term nutritional support to individuals and longer-term livelihood security programming for communities affected by AIDS. Such interdisciplinary research will need to be matched by intersectoral action on the part of the agriculture and health sectors in such environments.
Lessons learned in the conduct, validation, and interpretation of national population based HIV surveys.
Author: Calleja, J. M.; Marum, L. H.; Carcamo, C. P.; Kaetano, L.; Muttunga, J., and Way, A.
Source: AIDS. 2005 May; 19 Suppl 2:S9-S17.
Abstract: In the past few years several countries have conducted national population-based HIV surveys. Survey methods, levels of participation bias from absence or refusal and lessons learned conducting such surveys are compared in four national population surveys: Mali, Kenya, Peru and Zambia. In Mali, Zambia, and Kenya, HIV testing of adult women and men was included in the national-level demographic and health surveys carried out regularly in these countries, whereas in Peru the national HIV survey targeted young people in 24 cities with populations over 50 000.The household response rate was above 90% in all countries, but some individuals were absent for interviews. HIV testing rates were between 70 and 79% of those eligible, with higher test rates for women. Three critical questions in this type of survey need to be answered: who did the surveys miss; how much it matters that they were missed; and what can be done to increase the participation of respondents so the coverage rates are adequate. The level of representativeness of the populations tested was adequate in each survey to provide a reliable national estimate of HIV prevalence that complements other methods of HIV surveillance. Different lessons were learned from each survey.These population-based HIV seroprevalence surveys demonstrate that reliable and useful results can be obtained, although they require careful planning and increased financial and human resource investment to maximize responses at the household and individual level, which are key elements to validate survey results.This review was initiated through an international meeting on 'New strategies for HIV/AIDS Surveillance in Resource-constrained Countries' held in Addis Ababa on 26-30 January 2004 to share and develop recommendations to guide future surveys.
Public-private mix for control of tuberculosis and TB-HIV in Nairobi, Kenya: outcomes, opportunities and obstacles.
Author: Chakaya, J.; Uplekar, M.; Mansoer, J.; Kutwa, A.; Karanja, G.; Ombeka, V.; Muthama, D.; Kimuu, P.; Odhiambo, J.; Njiru, H.; Kibuga, D., and Sitienei, J.
Source: Int J Tuberc Lung Dis. 2008 Nov; 12(11):1274-1278.
Abstract: Setting:
Nairobi, the capital of Kenya.
Objective:
To promote standardised tuberculosis (TB) care by private health providers and links with the public sector.
Design and methods:
A description of the results of interventions aimed at engaging private health providers in TB care and control in Nairobi. Participating providers are supported to provide TB care that conforms to national guidelines. The standard surveillance tools are used for programme monitoring and evaluation.
Results:
By the end of 2006, 26 of 46 (57%) private hospitals and nursing homes were engaged. TB cases reported by private providers increased from 469 in 2002 to 1740 in 2006. The treatment success rate for smear-positive pulmonary TB treated by private providers ranged from 76% to 85% between 2002 and 2005. Of the 1740 TB patients notified by the private sector in 2006, 732 (42%) were tested for human immunodeficiency virus (HIV), of whom 372 (51%) were positive. Of the 372 HIV-positive TB patients, 227 (61%) were provided with cotrimoxazole preventive treatment (CPT) and 136 (37%) with antiretroviral treatment (ART).
Conclusion:
Private providers can be engaged to provide TB-HIV care conforming to national norms. The challenges include providing diagnostics, CPT and ART and the capacity to train and supervise these providers.
National scale-up of HIV testing and provision of HIV care to tuberculosis patients in Kenya.
Author: Chakaya, J. M.; Mansoer, J. R.; Scano, F.; Wambua, N.; L'Herminez, R.; iambo, J.; Mohamed, I.; Kangangi, J.; Ombeka, V.; Akeche, G.; Adala, S.; Gitau, S.; Maina, J.; Kibias, S.; Langat, B.; Abdille, N.; Wako, I.; Kimuu, P., and Sitienei, J.
Source: Int J Tuberc Lung Dis. 2008 Apr; 12(4):424-9.
Abstract: Setting:
Kenya, one of the 22 tuberculosis (TB) high-burden countries, whose TB burden is fuelled by the human immunodeficiency virus (HIV).
Objective:
To monitor and evaluate the implementation of HIV testing and provision of HIV care to TB patients in Kenya through the establishment of a routine TB-HIV integrated surveillance system.
Design:
A descriptive report of the status of implementation of HIV testing and provision of HIV interventions to TB patients one year after the introduction of the revised TB case recording and reporting system.
Results:
From July 2005 to June 2006, 88% of 112835 TB patients were reported to the National Leprosy and TB Control Programme, 98773 (87.9%) of whom were reported using a revised recording and reporting system that included TB-HIV indicators. HIV testing of TB patients increased from 31.5% at the beginning of this period to 59% at the end. Of the 46428 patients tested for HIV, 25558 (55%) were found to be HIV-positive, 85% of whom were provided with cotrimoxazole preventive treatment and 28% with antiretroviral treatment.
Conclusion:
A country-wide integrated TB-HIV surveillance system in TB patients can be implemented and provides essential data to monitor and evaluate TB-HIV related interventions.
Correlates of delayed disease progression in HIV-1-infected Kenyan children.
Author: Chakraborty, R.; Morel, A. S.; Sutton, J. K.; Appay, V.; Ripley, R. M.; Dong, T.; Rostron, T.; Ogola, S.; Palakudy, T.; Musoke, R.; D'Agostino, A.; Ritter, M., and Rowland-Jones, S. L.
Source: J Immunol. 2005 Jun 15; 174(12):8191-9.
Abstract: Without treatment most HIV-1-infected children in Africa die before their third birthday (>89%) and long-term nonprogressors are rare. The mechanisms underlying nonprogression in HIV-1-infected children are not well understood. In the present study, we examined potential correlates of delayed HIV disease progression in 51 HIV-1-infected African children. Children were assigned to progression subgroups based on clinical characterization. HIV-1-specific immune responses were studied using a combination of ELISPOT assays, tetramer staining, and FACS analysis to characterize the magnitude, specificity, and functional phenotype of HIV-1-specific CD8(+) and CD4(+) T cells. Host genetic factors were examined by genotyping with sequence-specific primers. HIV-1 nef gene sequences from infecting isolates from the children were examined for potential attenuating deletions. Thymic output was measured by T cell rearrangement excision circle assays. HIV-1-specific CD8(+) T cell responses were detected in all progression groups. The most striking attribute of long-term survivor nonprogressors was the detection of HIV-1-specific CD4(+) Th responses in this group at a magnitude substantially greater than previously observed in adult long-term nonprogressors. Although long-term survivor nonprogressors had a significantly higher percentage of CD45RA(+)CD4(+) T cells, nonprogression was not associated with higher thymic output. No protective genotypes for known coreceptor polymorphisms or large sequence deletions in the nef gene associated with delayed disease progression were identified. In the absence of host genotypes and attenuating mutations in HIV-1 nef, long-term surviving children generated strong CD4(+) T cell responses to HIV-1. As HIV-1-specific helper cells support anti-HIV-1 effector responses in active disease, their presence may be important in delaying disease progression.
Evidence for population level declines in adult HIV prevalence in Kenya.
Author: Cheluget, B.; Baltazar, G.; Orege, P.; Ibrahim, M.; Marum, L. H., and Stover, J.
Source: Sex Transm Infect. 2006 Apr; 82 Suppl 1:i21-6.
Abstract: The HIV/AIDS epidemic in Kenya has been tracked through annual sentinel surveillance in antenatal clinics since 1990. The system started with 13 sites and now has over 35. Behaviours have been measured through national Demographic and Health Surveys in 1993, 1998, and 2003. The surveillance data indicate that prevalence has declined substantially starting in 1998 in five of the original 13 sites and starting in 2000 in another four sites. No decline is evident in the other five original sites although the 2004 estimate is the lowest recorded. Nationally, adult prevalence has declined from 10% in the late 1990s to under 7% today. Surveys indicate that both age at first sex and use of condoms are rising and that the percentage of adults with multiple partners is falling. It is clear that HIV prevalence is now declining in Kenya in a pattern similar to that seen in Uganda but seven or eight years later. Although the coverage of preventive interventions has expanded rapidly since 2000 this expansion was too late to account for the beginnings of the decline in prevalence. More work is needed to understand fully the causes of this decline, but it is encouraging to see Kenya join the small list of countries experiencing significant declines in HIV prevalence.
Optimizing paediatric HIV care in Kenya: challenges in early infant diagnosis.
Author: Cherutich, P.; Inwani, I.; Nduati, R., and Mbori-Ngacha, D.
Source: Bull World Health Organ. 2008 Feb; 86(2):155-60.
Abstract: Problem:
In 2003, the goal of the Kenyan Ministry of Health was to avail antiretroviral treatment (ART) to 50% of the estimated 250 000 eligible individuals by the end of 2005. By July 2005, 45 000 adults and more than 2000 children were on treatment. A study was conducted to determine the barriers to identification of HIV-infected children.
Approach:
Existing government policies were reviewed and the ART register of the Kenya National AIDS Control Programme was used to identify facilities providing ART. This paper reports the findings around diagnosis and staging of HIV infection in children.
Local setting:
At the time of the study, 58 health facilities were providing ART to children. Only one institution had achieved universal HIV testing in the antenatal clinics. Six facilities systematically followed up HIV-exposed children. HIV antibody testing was not readily available to the children. Although four research centres were capable of carrying out diagnostic HIV polymerase chain reaction (PCR), the services were restricted to research purposes. Other constraints were inadequate physical infrastructure, inadequate systems for quality control in the laboratories and shortage of staff.
Lessons learnt:
The policy framework to support identification of HIV-infected children had been established, albeit with narrow focus on sick children. The assessment identified the weaknesses in the structures for systematic diagnosis of HIV through laboratory or clinical-based algorithms. The researchers concluded that health staff training and implementation of a systematic standard approach to identification of HIV-infected children is urgently required.
Selection for human immunodeficiency virus type 1 envelope glycosylation variants with shorter V1-V2 loop sequences occurs during transmission of certain genetic subtypes and may impact viral RNA levels.
Author: Chohan, B.; Lang, D.; Sagar, M.; Korber, B.; Lavreys, L.; Richardson, B., and Overbaugh, J.
Source: J Virol. 2005 May; 79(10):6528-31.
Abstract: Designing an effective human immunodeficiency virus type 1 (HIV-1) vaccine will rely on understanding which variants, from among the myriad of circulating HIV-1 strains, are most commonly transmitted and determining whether such variants have an Achilles heel. Here we show that heterosexually acquired subtype A HIV-1 envelopes have signature sequences that include shorter V1-V2 loop sequences and fewer predicted N-linked glycosylation sites relative to the overall population of circulating variants. In contrast, recently transmitted subtype B variants did not, and this was true for cases where the major risk factor was homosexual contact, as well as for cases where it was heterosexual contact. This suggests that selection during HIV-1 transmission may vary depending on the infecting subtype. There was evidence from 23 subtype A-infected women for whom there was longitudinal data that those who were infected with viruses with fewer potential N-linked glycosylation sites in V1-V2 had lower viral set point levels. Thus, our study also suggests that the extent of glycosylation in the infecting virus could impact disease progression.
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