Clinical research, prophylaxis, therapy, and care for HIV disease in Africa

Optimal management of cytomegalovirus retinitis in patients with AIDS

Cytomegalovirus (CMV) retinitis is the most common cause of vision loss in patients with acquired immunodeficiency syndrome (AIDS). CMV retinitis afflicted 25% to 42% of AIDS patients in the pre-highly active antiretroviral therapy (HAART) era, with most vision loss due to macula-involving retinitis or retinal detachment. The introduction of HAART significantly decreased the incidence and severity of CMV retinitis. Optimal treatment of CMV retinitis requires a thorough evaluation of the patient's immune status and an accurate classification of the retinal lesions. When retinitis is diagnosed, HAART therapy should be started or improved, and anti-CMV therapy with oral valganciclovir, intravenous ganciclovir, foscarnet, or cidofovir should be administered. Selected patients, especially those with zone 1 retinitis, may receive intravitreal drug injections or surgical implantation of a sustained-release ganciclovir reservoir. Effective anti-CMV therapy coupled with HAART significantly decreases the incidence of vision loss and improves patient survival. Immune recovery uveitis and retinal detachments are important causes of moderate to severe loss of vision. Compared with the early years of the AIDS epidemic, the treatment emphasis in the post- HAART era has changed from short-term control of retinitis to long-term preservation of vision. Developing countries face shortages of health care professionals and inadequate supplies of anti-CMV and anti-HIV medications. Intravitreal ganciclovir injections may be the most cost effective strategy to treat CMV retinitis in these areas.

A pilot study of once-daily antiretroviral therapy integrated with tuberculosis directly observed therapy in a resource-limited setting

To determine the feasibility and effectiveness of integrating highly active antiretroviral therapy (HAART) into existing tuberculosis directly observed therapy (TB/DOT) programs, we performed a pilot study in an urban TB clinic in South Africa. Patients with smear-positive pulmonary TB were offered HIV counseling and testing. Twenty HIV-positive patients received once-daily didanosine (400 mg) plus lamivudine (300 mg) plus efavirenz (600 mg) administered concomitantly with standard TB therapy Monday to Friday and self-administered on weekends. After completing TB therapy, patients were referred to an HIV clinic for continued treatment. At baseline, patients had a mean CD4 count of 230 cells/mm(3) (range: 24-499 cells/mm(3)) and a mean viral load of 5.75 log(10) (range: 3.81-7.53 log(10)). Seventeen completed combined standard TB and HIV therapy; 16 of 20 (80%) patients enrolled and 15 of 17 (88%) patients completing standard TB therapy achieved a viral load <50 copies/mL and mean CD4 count increase of 148 cells/mm(3). TB was cured in 17 of 20 (85%) enrolled patients and 17 of 19 (89%) patients with drug-sensitive TB. Treatment was well tolerated, with minimal gastrointestinal, hepatic, skin, or neurologic toxicity. The project was well accepted and integrated into the daily TB clinic functions. This pilot study demonstrates that TB/DOT programs can be feasible and effective sites for HIV identification and the introduction and monitoring of a once-daily HAART regimen in resource-limited settings.

Posterior segment manifestations of HIV/AIDS

The ocular posterior segment manifestations of AIDS may be divided into four categories: retinal vasculopathy, unusual malignancies, neuro-ophthalmologic abnormalities, and opportunistic infections. Microvasculopathy is the most common manifestation. Opportunistic infections, particularly cytomegalovirus retinitis and progressive outer retinal necrosis, are the most likely to result in visual loss due to infection or subsequent retinal detachment. Diagnosis and treatment are guided by the particular conditions and immune status of the patient.

Clinical and biological evolution of HIV-1 seroconverters in Abidjan, Côte d'Ivoire, 1997-2000

OBJECTIVE

To describe the clinical and biologic evolution of HIV-1 infection in Africa.

METHODS

One hundred four HIV-1-infected individuals were identified prospectively from regular blood donors in Abidjan, Côte d'Ivoire. The date of seroconversion was estimated from results of sequential serologic tests. Biologic and clinical follow-up was performed every 6 months, starting as early as possible after seroconversion. Case management followed national guidelines.

RESULTS

The median interval between estimated seroconversion and study inclusion was 9.7 months, and the median window of seroconversion was 2.8 months. At baseline, all but two patients were asymptomatic; the median CD4 + cell count was 527/mm 3 (interquartile range [IR], 395-684), and the median plasma HIV RNA level was 4.6 log 10 copies/ml (IR, 3.8-4.9). The median follow-up was 23.9 months, and 95% of the patients received primary prophylaxis with co-trimoxazole for opportunistic infections. Of the patients, 1 presented with wasting syndrome, 3 developed tuberculosis, and 17 had a Centers for Disease Control and Prevention category B-defining event. The 3-year AIDS-free and symptom-free probabilities were 96.7% (95% confidence interval [CI], 87.0-99.2] and 79.3% (95% CI, 67.5-87.2), respectively. During the first 3 years of follow-up, we observed that the median plasma viral load stabilized at >4 log 10 copies/ml and that the median CD4 + cell count declined by 20 to 25/mm 3 per year.

CONCLUSION

These African seroconverters were moderately immunosuppressed. The median HIV RNA level was high and varied very little during the first 3 years, and there were few clinical events.

Ocular lesions associated with HIV infection in India: a series of 100 consecutive patients evaluated at a referral center

PURPOSE

To document the ocular disorders seen in patients known to be infected with human immunodeficiency (HIV) virus at a referral eye clinic in India.

METHODS

The first 100 individuals known to be HIV-positive at a referral eye clinic between 1993 and 1998 were enrolled in a prospective study. They underwent complete ocular and systemic evaluation.

RESULTS

Most of the patients (76%) were in the 20-to 40-year age group. Heterosexual exposure to commercial sex workers was the most common risk factor (70%) for HIV infection. Cytomegalovirus (CMV) retinitis (17%) and HIV retinopathy (15%) were the most common HIV-associated ophthalmic lesions. Pulmonary tuberculosis (67%) and oropharyngeal candidiasis (66%) were the most commonly associated systemic infections. Ocular involvement was most common in children who contracted the disease through perinatal transmission (66.7%) and in homosexual patients (60%). Ocular involvement was comparatively less common in patients who contracted the disease through blood transfusions (33%) or exposure to commercial sex workers (24.3%).

CONCLUSIONS

This study shows that the spectrum of ocular lesions associated with HIV infection in India is different from that seen elsewhere in the world. The prevalence of CMV retinitis and HIV retinopathy is lower in India, and there have been no cases of ocular Kaposi sarcoma. Adnexal infections, albeit rare, were seen in our series. The nonavailability and cost of therapy influenced the visual prognosis in these patients.

A psychological epidemiology of people seeking HIV/AIDS counselling in Kenya: an approach for improving counsellor training

OBJECTIVE

This study develops a typology of psychological problems reported during HIV/AIDS counselling. This typology provides a framework for training paraprofessional counsellors (PPCs) in East Africa.

DESIGN

Study participants included 307 Kenyans tested for HIV at any of six clinics in Nairobi specialising in STDs, tuberculosis and other infectious diseases. Pre-test, post-test, and follow-up counselling was provided by 16 PPCs who are themselves HIV-positive. Data consisted of demographic, physical and psychological information reported by 168 clients who sought follow-up counselling.

METHODS

Counselling data were coded using an ipsative method; a unique code was assigned to every distinct topic. Factor analysis with a Varimax rotation reduced the original psychological variables into logical groupings. Multivariate analysis examined the relationship of factors and demographic characteristics.

RESULTS

Clients reported 1-10 physical and 1-23 psychological complaints in a single session. Sixty-five percent of female clients reported > or = eight psychological problems; 49% of males reported > or = eight psychological problems. Factor analyses allowed the 109 reported psychological events to be assigned to 15 categories of problems. Multivariate analyses explained little of the variance in the relationship between each client's demographic profile and the psychological factors.

CONCLUSIONS

Training for PPCs should be relevant to problems encountered during counselling. Results indicate that PPCs can expect clients to present one or more of the 15 factors during counselling. Demographic characteristics explained small amounts of variance in the distribution of factor scores. The 15 factors produced in this study, although descriptive and preliminary, could form the basis of a training curriculum for HIV PPCs.

Nigerian university students' knowledge, perceptions, and behaviours about HIV/AIDS: are these students at risk?

The purpose of the study was to determine the knowledge level of undergraduate students of a Nigerian university about HIV/AIDS, their perception of risk of contracting HIV/AIDS based on their sexual behaviour, and to assess how students acquire information about HIV/AIDS. The sample consisted of 380 students from five faculties of the university who volunteered to participate in the study. Participants completed a survey asking about their knowledge about transmission, symptomatology and prevention of HIV/AIDS. The survey included questions about their sexual orientation, past and present sexual practices as well as sources of information about HIV/AIDS. The results indicated that the students were knowledgeable about transmission and symptomatology but there were some misconceptions about the mode of transmission of HIV. Few students identified themselves to be at high risk even though majority of them (92%) were sexually experienced. The study also showed that even though these students are knowledgeable and concerned about contracting HIV/AIDS from their partners, this did not prevent them from engaging in unprotected sexual intercourse. It appears, however, that students are exercising caution when negotiating new sexual relationships, as they are likely to discuss (and insist on) using condoms and ask to have a monogamous relationship. Students obtained information about HIV/AIDS primarily from the media rather than from school classrooms and homes, which suggests a need to increase educational efforts at the university. Many students of this university may be at risk of becoming HIV-infected due to their age bracket, level of sexual activity and past/present sexual behaviors. University faculty can be actively involved in developing and implementing HIV/AIDS education and prevention strategies on their campuses. Health educators must go beyond providing accurate and gender-specific information about HIV/AIDS; they must also help students realistically assess their own risk of infection, and develop communication processes which enable them to negotiate safer sexual practices.

CD4+ T-lymphocyte counts in HIV infection: are European standards applicable to African patients?

CD4+ lymphocyte count (CD4+ LC) is a widely used marker of Human Immunodeficiency Virus (HIV) immune impairment. Physiological lymphocytosis is frequently encountered in Africans. Therefore, we tried to determine if given CD4+ LC levels are of similar significance in European versus African HIV-infected individuals. Lymphocyte phenotyping of 750 HIV-infected adults was retrospectively analyzed. Three hundred and seventy patients were consecutively selected in Paris, France; 185 in Abidjan, Côte d'Ivoire; and 195 in Bobo-Dioulasso, Burkina Faso. In the three settings, lymphocyte phenotyping was performed by flow cytometry using similar protocols. Data from Abidjan and Bobo-Dioulasso were combined on the basis of geographic proximity and contrasted with those from Paris. Geometric mean levels of Total Lymphocyte Count (TLC), CD4+ LC, CD8+ lymphocyte count (CD8+ LC), and CD4:CD8 ratio, adjusted for percentage of CD4+ T-cells (%CD4+), were compared between Africans and Europeans. For a given %CD4+, TLC and CD4+ LC but not CD8+ LC tended to be about one third higher in West African than in French adults (p < 0.0001). Approximate equivalencies of absolute CD4+ counts in French and West African HIV-infected adults suggest that where thresholds of 200 and 500 CD4+ cells/microliter are applied in Europe, it might be appropriate to apply a threshold of approximately 250 and 700 CD4+ cells/microliter in West Africa, respectively. Establishing indicators of progression of HIV infection with locally appropriate thresholds may represent important steps toward improvement of HIV disease management in Africa.

Epidemiological characteristics of human immunodeficiency virus type-2 infection in Africa

There are things yet to be clarified about African HIV-2 infection, compared to HIV-1 infection. However, the epidemiological characteristics have gradually been elucidated through various studies. HIV-2 infection is believed to have existed in the 1960s in Africa and is presently epidemic in West Africa. The HIV-2 seropositive rate for the general population is higher in urban regions than in rural areas. The peak age of persons infected with the HIV-2 tends to be higher than that of persons infected with the HIV-1, but no sex difference was recognized between the HIV-2 and HIV-1 seropositive rates. Sexual contact, mother-to-child transmission and blood transfusion have been confirmed as HIV-2 transmission modes. Prostitutes and patients with other STD are recognized as being high-risk groups for the HIV-2 infection. Patients who are infected with both HIV-1 and HIV-2 have also been identified, but it is suggested that the pathogenicity of HIV-2 is lower than that of HIV-1.

Contribution of tuberculosis to slim disease in Africa

OBJECTIVES

To assess the contribution of tuberculosis to the aetiology of the HIV wasting syndrome (slim) in Africa, a condition usually considered an enteropathy.

METHODS

Clinical examination and representative necropsy study of adult patients positive for HIV.

SETTING

Hospital medical wards in Abidjan, Ivory Coast.

SUBJECTS

Adults positive for HIV.

MAIN OUTCOME MEASURES

CD4 T lymphocyte counts before death, clinical and anthropometric data, and gross and microscopic pathology.

RESULTS

Necropsy was done on 212 HIV positive adults. Tuberculosis was found in 41 of 93 with the clinical HIV wasting syndrome and in 32 of 119 without (odds ratio 2.1, 95% confidence interval 1.2 to 4.0). A significant association existed between the prevalence of tuberculosis at necropsy and the degree of cadaveric wasting (no wasting 25% (15/59); moderate wasting 40% (23/58); skeletal wasting 44% (42/95); P = 0.02). Wasting was also associated with a history of chronic diarrhoea, but no association existed between diarrhoea and tuberculosis. Median CD4 T lymphocyte counts were lowest in wasted patients irrespective of findings at necropsy and in those with chronic diarrhoea (< 60 x 10(6)/l).

CONCLUSION

Wasting and chronic diarrhoea are late stage manifestations of HIV disease in Africa. The importance of tuberculosis as a contributing factor in the pathogenesis of the slim syndrome has been underestimated. In nearly half of patients dying with severe wasting, tuberculosis was the dominant pathological finding.