The epidemiology of human immunodeficiency virus in South Africa

We review the epidemiology of human immunodeficiency virus (HIV) in South Africa where the prevalence of HIV infection is among the highest in the world. The epidemic reached South Africa relatively recently but the prevalence of infection has increased rapidly and there are significant differences among provinces. Although few 15-year-old people are infected the prevalence increases rapidly with age thereafter, especially among women. The prevalence of herpes simplex virus type 2 exceeds that of HIV and curable sexually transmitted infections are common. 'Circular migration' may help to explain the high rates and rapid spread of HIV in the region. The incidence of tuberculosis has increased dramatically as a result of the HIV epidemic. Antiretroviral therapy for the prevention of vertical transmission has been shown to be effective in local conditions but transmission through breast-feeding remains problematical. While some epidemiological models have been developed, much more needs to be done in this regard in order to plan, coordinate and evaluate an effective response to the epidemic. We conclude by discussing some of the research that is needed and steps that could be taken to reduce the continued spread of the infection.     

Epidemic process of HIV-infection and HIV-associated tuberculosis in Primorsky region

The article provides data on HIV-infection prevalence in Primorsky region as well as on characteristics of HIV-infection epidemic process, distribution of HIV-infected persons by sex, age, routes and factors of transmission. Rise of HIV-associated tuberculosis incidence is registered in Primorsky region in recent years. HIV-infected persons have increased risk of tuberculosis progression. Prognosis for HIV-infection and HIV-associated tuberculosis incidence for the next years was done.     

Impact of HIV on tuberculosis in Zambia: a cross sectional study.

OBJECTIVE--To examine the contribution of HIV infection to the apparently increasing incidence of tuberculosis in central Africa. DESIGN--Cross sectional study. SETTING--Outpatient clinic in teaching hospital, Lusaka, Zambia. PATIENTS--346 Adult patients with tuberculosis. RESULTS--Overall, 206 patients (60%; 95% confidence interval 54% to 65%) were positive for HIV--in one or both assays used. The peaks for both tuberculosis and HIV infection were among men aged 25-34 years and women aged 14-24 years. Of patients with confirmed pulmonary tuberculosis, 73/149 (49%; 41% to 57%) were positive for HIV; 67/83 (81%; 70% to 89%) patients with pleural disease and 16/19 (84%; 60% to 97%) patients with pericardial disease were positive. HIV positive patients with positive sputum culture were less likely to have had a positive sputum smear, and their chest x ray films less often showed classic upper zone disease or cavitation. Of 72 patients who fulfilled clinical criteria for AIDS, 17 were negative for HIV. CONCLUSIONS--The high prevalence of HIV in patients with tuberculosis suggests that an epidemic of reactivating tuberculosis is arising in those who are infected with HIV. The redirection of public health priorities towards tuberculosis would focus on a major treatable and preventable complication of the AIDS epidemic.     

On the role of social clusters in the transmission of infectious diseases

We introduce a spatial stochastic model for the spread of tuberculosis and HIV. We have three parameters: the size of the social cluster for each individual and the infection rates within and outside the social cluster. We show that when the infection rate from outside the cluster is low (this is presumably the case for tuberculosis and HIV) then an epidemic is possible only if the typical social cluster and the within infection rate are large enough. These results may be important in formulating new hypotheses for the transmission of TB and HIV.     

Twenty years of human immunodeficiency virus infection in Croatia--an epidemic that is still in an early stage

Croatia has a low-level HIV epidemic; 553 persons were diagnosed with HIV infection in the period 1985-2005. The principal mode of transmission was sex between men (40% of cases) and heterosexual contact (40%). Only about 10% of cases were injecting drug users. Testing data also suggest a low prevalence of HIV infection in Croatia, even in vulnerable groups. Behavioral data indicate risky sexual behaviors, with the clear need for interventions. National policy towards HIVIAIDS is operated through the National Committee on HIV/AIDS, a multisectorial advisory body to the Government of Croatia. Croatia applied to the Global Fund to fight AIDS, tuberculosis and malaria in 2002 which resulted in a 4,9 million USD grant for scaling up prevention interventions. Croatia has a centralized system of treatment and care which is provided at the University Hospital for Infectious Diseases in Zagreb. Highly active antiretroviral treatment is provided free of charge from April 1998.     

Keeping the faith: African American faith leaders' perspectives and recommendations for reducing racial disparities in HIV/AIDS infection

In Philadelphia, 66% of new HIV infections are among African Americans and 2% of African Americans are living with HIV. The city of Philadelphia has among the largest numbers of faith institutions of any city in the country. Although faith-based institutions play an important role in the African American community, their response to the AIDS epidemic has historically been lacking. We convened 38 of Philadelphia's most influential African American faith leaders for in-depth interviews and focus groups examining the role of faith-based institutions in HIV prevention. Participants were asked to comment on barriers to engaging faith-based leaders in HIV prevention and were asked to provide normative recommendations for how African American faith institutions can enhance HIV/AIDS prevention and reduce racial disparities in HIV infection. Many faith leaders cited lack of knowledge about Philadelphia's racial disparities in HIV infection as a common reason for not previously engaging in HIV programs; others noted their congregations' existing HIV prevention and outreach programs and shared lessons learned. Barriers to engaging the faith community in HIV prevention included: concerns about tacitly endorsing extramarital sex by promoting condom use, lack of educational information appropriate for a faith-based audience, and fear of losing congregants and revenue as a result of discussing human sexuality and HIV/AIDS from the pulpit. However, many leaders expressed a moral imperative to respond to the AIDS epidemic, and believed clergy should play a greater role in HIV prevention. Many participants noted that controversy surrounding homosexuality has historically divided the faith community and prohibited an appropriate response to the epidemic; many expressed interest in balancing traditional theology with practical public health approaches to HIV prevention. Leaders suggested the faith community should: promote HIV testing, including during or after worship services and in clinical settings; integrate HIV/AIDS topics into health messaging and sermons; couch HIV/AIDS in social justice, human rights and public health language rather than in sexual risk behavior terms; embrace diverse approaches to HIV prevention in their houses of worship; conduct community outreach and host educational sessions for youth; and collaborate on a citywide, interfaith HIV testing and prevention campaign to combat stigma and raise awareness about the African American epidemic. Many African American faith-based leaders are poised to address racial disparities in HIV infection. HIV prevention campaigns should integrate leaders' recommendations for tailoring HIV prevention for a faith-based audience.     

Glomerular lesions in HIV-infected patients: a Yale University Department of Medicine Residency Peer-Teaching Conference.

HIV-associated nephropathy (HIVAN) is a clinicopathologic entity characterized by heavy proteinuria, absence of edema and an irreversible decline in renal function. Findings on renal biopsy include: collapsed glomerular capillaries; visceral glomerular epitheliosis; microcystic tubules; mesangial prominence; and endothelial tubuloreticular inclusions. Early in the AIDS epidemic, HIVAN was the predominant glomerular lesion observed in HIV-infected patients. It is being increasingly recognized, especially in Caucasian populations, that a variety of immune complex-mediated lesions such as membranoproliferative glomerulonephritis, proliferative glomerulonephritis and IgA nephropathy are associated with HIV infection. In this review we present two cases: one patient whose first presentation of AIDS was end-stage renal disease, who on biopsy was found to have HIVAN, and the second, who was infected with HIV, and on biopsy was found to have hepatitis C-related hepatitis C related membranoproliferative glomerulonephritis. We also review the current literature on HIVAN and HIV-associated immune complex diseases (HIVICDs). Each case illustrates an important clinical point. The first that renal disease can be the first manifestation of HIV infection and the second that HIV-infected patients may develop immune complex related renal diseases, some of which may be potentially treatable.     

The association between HIV and fertility in a cohort study in rural Tanzania

Recent studies in sub-Saharan Africa have shown that fertility is reduced among HIV-infected women compared with uninfected women. The size and pattern of this fertility reduction has important implications for antenatal clinic-based surveillance of the epidemic and also for estimates and projections of the demographic impact of the epidemic. This paper examines the association between HIV and fertility in Kisesa, a rural area in Tanzania, where HIV prevalence among adults is about 6% and gradually increasing. The analysis is based on data obtained through a demographic surveillance system in Kisesa during 1994-98 and two large sero-surveys of all residents in 1994-95 and 1996-97. The HIV-associated fertility reduction among women was investigated by estimating fertility rates by HIV status and prevalence rates by fertility status. A substantial reduction (29%) was observed in fertility among HIV-infected women compared with HIV-uninfected women. The fertility reduction was most pronounced during the terminal stages of infection, but no clear association with duration of infection was observed. Use of modern contraception was higher among HIV-infected women. However, both among contracepting and non-contracepting women, a substantial reduction in fertility was seen among HIV-infected women.     

Estimating the size of the HIV epidemic by using mortality data

Evidence that more people are dying as a result of HIV infection than is reflected by the number of deaths among reported cases meeting the WHO definition of AIDS is derived from mortality data. Ninety-five causes of death likely to be associated with HIV infection were selected. Standardized mortality ratios due to these causes increased for single men aged 15-54 years from 100 in 1984 to 118 in 1987. The age, sex, marital status, temporal and geographic distribution of these excess deaths suggest that they are HIV-associated. It is estimated that 58% of excess deaths due to HIV-related causes were among cases reported to the CDSC AIDS Surveillance Programme in 1987. Some of these deaths may have been among HIV-positive people who did not meet the WHO definition at the time of death. There is a need for surveillance to be extended to include HIV-positive people who die before meeting the WHO definition if the full extent of the HIV epidemic is to be identified.     

Aids, Policy and Bioethics: Ethical Dilemmas Facing China in HIV Prevention

The present situation of the HIV/AIDS epidemic is very grim in China. The probability of China becoming a country with a high prevalence of HIV/AIDS cannot be excluded because there have been factors which promote the wide spread of HIV if we fail to take timely action to prevent it at the opportune moment. However, China's HIV prevention policy is inadequate. Health professionals and programmers believed that they could take a conventional public health approach to cope with the HIV epidemic. They simply ignored the fact that HIV infection is an epidemic so special that their approach is not effective to deter the epidemic. Many health professionals and programmers bypassed ethical issues that had emerged in the prevention of the HIV epidemic. Even some health educators, sexologists and officials believe that `AIDS is the punishment for promiscuity', and this belief has led to discrimination and stigmatization of AIDS patients, HIV positive people, their family members and high risk groups. Although homosexuality is not illegal, the police can always find any reason to detain homosexuals. A difficult ethical issue is about the laws prohibiting prostitution and drug use in China which force prostitutes and intravenous drug users underground, giving them no chance to access information, education and the services needed to protect them. The dilemma facing China is whether to stay with a restrictive policy for the reason of ideology cleansing or to turn to a more supportive policy. It is necessary to have some change in the ethical framework to evaluate the action in HIV prevention. Tolerance should be the first ethical principle.     

AIDS, policy and bioethics: ethical dilemmas facing China in HIV prevention: a report from China

The present situation of the HIV/AIDS epidemic is very grim in China. The probability of China becoming a country with a high prevalence of HIV/AIDS cannot be excluded because there have been factors which promote the wide spread of HIV if we fail to take timely action to prevent it at the opportune moment. However, China's HIV prevention policy is inadequate. Health professionals and programmers believed that they could take a conventional public health approach to cope with the HIV epidemic. They simply ignored the fact that HIV infection is an epidemic so special that their approach is not effective to deter the epidemic. Many health professionals and programmers bypassed ethical issues that had emerged in the prevention of the HIV epidemic. Even some health educators, sexologists and officials believe that `AIDS is the punishment for promiscuity', and this belief has led to discrimination and stigmatization of AIDS patients, HIV positive people, their family members and high risk groups. Although homosexuality is not illegal, the police can always find any reason to detain homosexuals. A difficult ethical issue is about the laws prohibiting prostitution and drug use in China which force prostitutes and intravenous drug users underground, giving them no chance to access information, education and the services needed to protect them. The dilemma facing China is whether to stay with a restrictive policy for the reason of ideology cleansing or to turn to a more supportive policy. It is necessary to have some change in the ethical framework to evaluate the action in HIV prevention. Tolerance should be the first ethical principle.     

Tuberculosis in patients with human immunodeficiency virus infection. Review of current concepts.

Tuberculosis is a frequent complication of human immunodeficiency virus (HIV)-induced immunosuppression. The diagnosis of extrapulmonary tuberculosis in patients with evidence of HIV infection qualifies as a criterion of the acquired immunodeficiency syndrome. Demographic characteristics of patients with tuberculosis and HIV infection vary by region and reflect the degree to which patients with Mycobacterium tuberculosis infection adopt behaviors that put them at risk for HIV infection. The clinical features of tuberculosis in patients with HIV infection are atypical. Extrapulmonary disease, tuberculin anergy, and unusual findings on chest radiographs occur most frequently when tuberculosis afflicts patients with other clinical evidence of HIV infection at the time tuberculosis is diagnosed. Treatment is effective for tuberculosis in HIV-seropositive patients, and isoniazid prophylaxis is recommended for HIV-infected patients with positive tuberculin skin tests.     

Predicting the impact of a nonsterilizing vaccine against human immunodeficiency virus

Studies of human immunodeficiency virus (HIV) vaccines in animal models suggest that it is difficult to induce complete protection from infection (sterilizing immunity) but that it is possible to reduce the viral load and to slow or prevent disease progression following infection. We have developed an age-structured epidemiological model of the effects of a disease-modifying HIV vaccine that incorporates the intrahost dynamics of infection, a transmission rate and host mortality that depend on the viral load, the possible evolution and transmission of vaccine escape mutant viruses, a finite duration of vaccine protection, and possible changes in sexual behavior. Using this model, we investigated the long-term outcome of a disease-modifying vaccine and utilized uncertainty analysis to quantify the effects of our lack of precise knowledge of various parameters. Our results suggest that the extent of viral load reduction in vaccinated infected individuals (compared to unvaccinated individuals) is the key predictor of vaccine efficacy. Reductions in viral load of about 1 log(10) copies ml(-1) would be sufficient to significantly reduce HIV-associated mortality in the first 20 years after the introduction of vaccination. Changes in sexual risk behavior also had a strong impact on the epidemic outcome. The impact of vaccination is dependent on the population in which it is used, with disease-modifying vaccines predicted to have the most impact in areas of low prevalence and rapid epidemic growth. Surprisingly, the extent to which vaccination alters disease progression, the rate of generation of escape mutants, and the transmission of escape mutants are predicted to have only a weak impact on the epidemic outcome over the first 25 years after the introduction of a vaccine.     

A strategy for the control of HIV infection and viral hepatitides against the background of the narcotic abuse epidemic

The presence of the epidemic of drug addiction in the Russian Federation is stated: for the recent 10 years the number of drug addicts increased 3.5-fold. The questioning of several thousand drug addicts has revealed that 60% of them have hepatitis B, 80% have hepatitis C, 10% have syphilis. The strategy of controlling HIV infection among drug addicts is proposed. It includes, in the first place, the prevention of the secondary infection from HIV-infected addicts; in the second place, the detection of HIV-infected persons in groups of drug addicts, difficult to establish contacts with; in the third place, the primary prophylaxis within the program "Harm reduction" in the most susceptible groups of drug addicts. The thesis that the prevention of HIV infection must become the prevention of drug addiction by rendering multi-stage assistance to HIV-infected persons, including mainly drug addicts, is substantiated.     

Prospects for new antitubercular drugs

The inexorable rise in cases of tuberculosis worldwide, fuelled by the HIV epidemic, highlights the need for new drugs and particularly those that can shorten the duration of treatment. Clinical trials of existing broad-spectrum agents such as the fluoroquinolone moxifloxacin are proceeding, on the basis of efficacy in models of infection and preliminary clinical data. These may provide a stopgap, but the real breakthrough will come when novel agents with potent sterilising activity are discovered. Few such novel pre-clinical drug candidates exist and therefore considerable effort is being exerted to employ new tools to identify drug targets essential for survival of Mycobacterium tuberculosis.     

Male circumcision: hope for HIV infection decrease in southern Africa

Given the magnitude of the HIV pandemic, development of new prevention means is necessary. Male circumcision reduces HIV transmission from female to male by 57 % [95 % Confident Interval (CI): 42-68 %]. Its generalization in sub-Saharan Africa could avert, among men and women, from 1 to 4 millions new HIV infections over the next ten years. Acceptability of this new prevention mean is high in countries which could benefit the most from male circumcision, that means located in southern Africa, a region where in majority men are uncircumcised and where HIV prevalence is high. Male circumcision is a cost-effective prevention strategy. Actual prevention means (condoms, sexual abstinence and fidelity) are not used enough to curb the HIV epidemic. Research is ongoing on other prevention means (vaccine, pre- and post-exposition prophylaxis, microbicides, diaphragm) but their efficiency has not been demonstrated yet. Nevertheless, generalization of circumcision in southern Africa is responsible for contestations in part due to the fact that this prevention mean protects only partially from HIV infection. Moreover, for now, only a few countries integrated circumcision in their HIV prevention program in spite of WHO (World Health Organization) recommendations supporting male circumcision acknowledgement as an additional, important strategy for the prevention of heterosexually acquired HIV infection in men. Significant available funding should allow the situation to evolve quickly. At the same time, research goes on in order to know more about the effects and to facilitate the generalization of this prevention mean which is a great hope for southern Africa.     

HIV infection in Russia and Commonwealth of Independent States: current situation and prospective

The dynamics of the spread of HIV infection in Russia and the CIS countries is presented. The relationship between the spread of HIV infection and an increase in the number of injection drug users is substantiated. The factors inhibiting the spread of the epidemic of HIV/AIDS in Russia and the CIS countries are analyzed with due regard to the world experience. Attention is paid to the development of the epidemic situation in HIV infection due to, similarly to Russia and to more than 100 countries of the world, drug addiction. The effectiveness of the activity of the Russian health service organs in controlling this epidemic is emphasized. The prospects of prophylactic measures for controlling HIV infection in Russia and the CIS countries are determined.     

Complications of Antiretroviral Therapy Initiation in Hospitalised Patients with HIV-Associated Tuberculosis

Background

HIV-associated tuberculosis is a common coinfection in Sub-Saharan Africa, which causes high morbidity and mortality. A sub-set of HIV-associated tuberculosis patients require prolonged hospital admission, during which antiretroviral therapy initiation may be required. The aim of this study was to document the causes of clinical deterioration of hospitalised patients with HIV-associated tuberculosis starting antiretroviral therapy in order to inform healthcare practice in low- to middle-income countries.

Methods

Prospective, observational cohort study of adult inpatients with HIV-associated tuberculosis starting antiretroviral therapy in a dedicated tuberculosis hospital in Cape Town, South Africa. Causes of clinical deterioration and outcome were recorded in the first 12 weeks of antiretroviral therapy. Patients with rifampicin-resistant tuberculosis were excluded.

Results

Between May 2009 and November 2010, 112 patients (60% female), with a median age of 32 years were enrolled. At baseline the median CD4 count was 55 cells/mm³ (IQR 31–106) and HIV viral load 5.6 log copies/mL. All patients had significant comorbidity: 82% were bed-bound, 65% had disseminated tuberculosis and 27% had central nervous system tuberculosis. Seventy six patients (68%) developed 144 clinical events after starting antiretroviral therapy. TB-IRIS, hospital-acquired infections and significant drug toxicities occurred in 42%, 20.5% and 15% of patients respectively. A new opportunistic disease occurred in 15% of patients and a thromboembolic event in 8%. Mortality during the 12 week period was 10.6%.

Conclusions

High rates of TB-IRIS, hospital-acquired infections and drug toxicities complicate the course of patients with HIV-associated tuberculosis starting antiretroviral therapy in hospital. Despite the high morbidity, mortality was relatively low. Careful clinical management and adequate resources are needed in hospitalised HIV-TB patients in the 1^st three months following ART initiation.     

A Screen-and-Treat Strategy Targeting Visceral Leishmaniasis in HIV-Infected Individuals in Endemic East African Countries: The Way Forward?

In the wake of the HIV epidemic, visceral leishmaniasis (VL), a disseminated protozoan infection caused by the Leishmania donovani complex, has been re-emerging, particularly in North Ethiopia where up to 40% of patients with VL are co-infected with HIV. Management of VL in HIV co-infection is complicated by increased drug toxicity, and high treatment failure and relapse rates with all currently available drugs, despite initiation of antiretroviral treatment. Tackling L. donovani infection before disease onset would thus be a logical approach. A screen-and-treat approach targeting latent or the early stage of infection has successfully been implemented in other HIV-associated opportunistic infections. While conceptually attractive in the context of VL–HIV, the basic understanding and evidence underpinning such an approach is currently lacking. Prospective cohort studies will have to be conducted to quantify the risk of VL in different risk groups and across CD4 cell count levels. This will allow developing clinical prognostic tools, integrating clinical, HIV and Leishmania infection markers. Interventional studies will be needed to evaluate prophylactic or pre-emptive treatment strategies for those at risk, ideally relying on an oral (combination) regimen. Issues like tolerability, emergence of resistance and drug interactions will require due attention. The need for maintenance therapy will have to be assessed. Based on the risk–benefit data, VL risk cut-offs will have to be identified to target treatment to those most likely to benefit. Such a strategy should be complemented with early initiation of antiretroviral treatment and other strategies to prevent HIV and Leishmania infection.     

AIDS-associated malignancies: research perspectives

The appearance in 1981 of a usually rare malignancy, Kaposi’s sarcoma, in homosexual men [1] was one of the first harbingers of an epidemic caused by a retrovirus, human immunodeficiency virus (HIV), which causes the acquired immunodeficiency syndrome (AIDS). Lymphoid and other malignancies were also increased, most strikingly non-Hodgkin’s lymphoma and primary central nervous system (CNS) lymphoma. Advances in molecular biology, immunology, virology, and anti-viral therapy have combined to create unique research opportunities. One developing theme is the role of viral co-infection and malignancy. Human herpes virus 8 (HHV8), Epstein-Barr virus (EBV) and papilloma virus each may have a causal role in the development of HIV-associated malignancy. New antiretroviral therapies are able to substantially reverse or delay the profound immunosuppression of HIV infection. The changes in the epidemiology of malignancies, and understanding the mechanism of action of these new therapeutics provide research opportunities to understand the pathogenesis of these malignancies. The opportunities to discover the consequences of T-cell based immunodeficiency and the interactions with specific viral pathogens will likely lead to progress in HIV treatment and new strategies for other malignancies.