Communication for HIV/AIDS prevention in Kenya: social-cultural considerations

Clear case definitions of malaria are an essential means of evaluating the effectiveness of present and proposed interventions in malaria. The clinical signs of malaria are nonspecific, and parasitemia accompanied by a fever may not be sufficient to define an episode of clinical malaria in endemic areas. We defined and quantified cases of malaria in people of different age groups from 2 areas with different rates of transmission of malaria.

A total of 1602 people were followed up weekly for 2 years, and all the cases of fever accompanied by parasitemia were identified. Logistic regression methods were used to derive case definitions of malaria.

Two case definitions of malaria were derived: 1 for children 1-14 years old and 1 for infants (<1 year old) and older children and adults (> or =15 years old). We also found a higher number of episodes of clinical malaria per person per year in people from an area of low transmission of malaria, compared with the number of episodes in those from an area of higher transmission (0.84 vs. 0.55 episodes/person/year; incidence rate ratio, 0.66 [95% confidence interval, 0.61-0.72]; P<.001).

Case definitions of malaria are bound to be altered by factors that affect immunity, such as age and transmission. Case definitions may, however, be affected by other immunity-altering factors, such as HIV and vaccination status, and this needs to be borne in mind during vaccine trials.

Recent clinical trials in Africa, in combination with several observational epidemiological studies, have provided evidence that male circumcision can reduce HIV female-to-male transmission risk by 60% or more. However, the public health impact of large-scale male circumcision programs for HIV prevention is unclear.

Two mathematical models were examined to explore this issue: a random mixing model and a compartmental model that distinguishes risk groups associated with sex work. In the compartmental model, two scenarios were developed, one calculating HIV transmission and prevalence in a context similar to the country of Botswana, and one similar to Nyanza Province, in western Kenya.

In both models, male circumcision programs resulted in large and sustained declines in HIV prevalence over time among both men and women. Men benefited somewhat more than women, but prevalence among women was also reduced substantially. With 80% male circumcision uptake, the reductions in prevalence ranged from 45% to 67% in the two "countries", and with 50% uptake, from 25% to 41%. It would take over a decade for the intervention to reach its full effect.

Large-scale uptake of male circumcision services in African countries with high HIV prevalence, and where male circumcision is not now routinely practised, could lead to substantial reductions in HIV transmission and prevalence over time among both men and women.

@nbsp; Placental malaria (PM) and maternal infection with human immunodeficiency virus (HIV) type 1 have been shown to affect infant morbidity and immune responses to Plasmodium falciparum. We studied the effects of PM and HIV infection on the antimalarial antibody responses and morbidity outcomes of infants throughout the first year of life.

@nbsp; A total of 411 Kenyan infants who were born to mothers who were singly or dually infected with PM and/or HIV had their levels of immunoglobulin G antibody to 6 P. falciparum antigens/epitopes (apical membrane antigen-1, erythrocyte-binding antigen-175; liver-stage antigen-1 [LSA-1], circumsporozoite protein [CSP], merozoite surface protein-2, and rhoptry-associated protein-1 [RAP-1]) and to tetanus toxoid (TT) tested using enzyme-linked immunosorbent assay.

@nbsp; PM had little effect on the antibody responses of infants, whereas maternal HIV infection resulted in decreased levels of antibody to LSA-1, CSP, and RAP-1 epitopes at birth, compared with the absence of PM and maternal HIV infection ([Formula: see text]). Levels of antibodies to TT were significantly reduced in infants born to mothers coinfected with HIV and PM, compared with the levels noted in infants born to HIV-negative mothers ([Formula: see text]). In HIV-infected infants, levels of antibody to TT were reduced, but levels of antibody to malarial antigens were not. Antimalarial antibody levels were positively associated with malaria-related morbidity outcomes.

@nbsp; Infant HIV infection and maternal coinfection with HIV and PM negatively influence antibody responses to TT, but not those to malarial antigens, in infants. Antimalarial antibodies rarely showed protective associations with morbidity in infants and were more often a marker for malaria exposure and risk of infection.

Behavioral interventions in female sex workers (FSWs) are associated with changes in sexual behavior and reduced rates of sexually transmitted infections (STIs) and HIV We examined the sustainability of such interventions.

HIV-uninfected Kenyan FSWs were enrolled in a clinical trial that provided free male condoms, community and clinic-based counseling, and STI management. After trial completion, scaled-back community-based resources remained in place. More than a year later, women were invited to complete a follow-up behavioral questionnaire and to undergo STI/HIV counseling and testing. Individual changes in sexual behavior were assessed by paired analysis.

One hundred seventy-two women participated in the resurvey 1.2 years after trial termination. Client numbers had risen (paired t test, P < 0.001), but condom use had also increased (P < 0.001); both remained substantially lower than at enrollment. Regular partners accounted for a greater proportion of unprotected FSW sexual encounters (35% vs. 10%; P < 0.001). Only 9 (5.2%) of 172 women had a conventional STI, and the follow-up HIV incidence of 1.6 per 100 person-years (PYs) was similar to that during the trial period (3.7 per 100 PYs). Incident STIs and HIV were associated with the frequency of unprotected sex and younger age.

Less intensive community-based risk reduction services after clinical trial termination may support ongoing reductions in STIs and HIV among high-risk FSWs.

There are limited reports on HIV-1 RNA load, CD4+ T-lymphocytes and antibody responses in relation to disease progression in HIV-1 infected untreated children in Africa.

To describe the relationships between these parameters, we conducted a longitudinal cohort study involving 51 perinatally HIV-1 infected children aged between 1 and 13 years. HIV status was determined by ELISA and confirmed by western blot and PCR. Antibodies were quantified by limiting dilution ELISA, plasma HIV-1 RNA load by RT-PCR and CD4+ T-lymphocytes by FACSCount.

Asymptomatic and symptomatic disease had, respectively, a rise in median HIV-1 RNA load from 1,195 to 132,543 and from 42,962 to 1,109,281 copies/ml in children below 6 years. The increase in viral load was 10-fold higher for asymptomatic compared to other categories and 2-fold faster for children less than 6 years than those above. Similarly, symptomatic children below 6 years had initial median CD4+ T-lymphocyte counts of 647 (22%) cells/muL, declining to 378 (20%) while those above 6 years had initial values of below 335 (15%) but which increased to 428 (17%). Median viral load correlated significantly with median CD4+ T-lymphocyte percentage in children above 6 years (p=0.026) but not below.

Viral load is lower in older than younger children and correlates significantly with percentage CD4+ T-lymphocytes. Survival by HIV-1 infected children requires a competent immune response early in infection to counter the rapidly replicating virus. Interventions aimed at boosting the naive immune system may prolong survival in these children.

Mother- to- Child Transmission (MTCT) of HIV is a relatively new concept in rural populations and despite the huge amount of work that has been done on the HIV/AIDS, there still remains a dearth of information in knowledge of mothers on this concept especially in areas related to appropriate feeding methods for infants born to mothers infected with the virus.

To determine maternal knowledge on MTCT of HIV in the rural setting and to examine viable breastmilk alternatives for mothers who would be HIV positive.

A rural district community and Homa-Bay District Hospital in South Western Kenya.

One hundred and twelve non-tested mothers having infants aged 0-12 months in the community and a sub-group (10%) of HIV positive mothers from the District Hospital.

Maternal knowledge on MTCT of HIV was as low as 8.9% in the study area. The MTCT knowledge was found to influence the alternative feeding choice as mentioned by the non-tested mothers (p = 0.001; OR = 1.41; 95%CI, 1.04-3.86). Those with high MTCT knowledge tended to be more receptive and considered feeding alternatives other than cowmilk like expressed breastmilk (p = 0.1 5), formula (p = 0.036; OR = 2.44; 95%CI, 1.66-6.04) and milk from milk bank (p = 0.015; OR = 1.34; 95%CI, 1.13-5.50) than their counterparts with low MTCT knowledge. Cowmilk, formula and wet-nursing were the three feeding alternatives that were viable with varying socio-cultural, economic and/or nutritional constraints.

Maternal MTCT knowledge influences the choice of alternative infant feeding option but not breastfeeding practices. Cowmilk is the most common, socio-culturally acceptable and accessible breastmilk alternative in this community. It is recommended that in order to improve MTCT knowledge, health education and nutrition counselling be intensified in PMTCT programmes, VCT centers and ANC clinics. Concurrently, effort should be made to increase the supply of cowmilk within the community so as to make it more readily available and affordable.

To build capacity in the resource-poor setting to support the clinical investigation and treatment of AIDS-related malignancies in a region of the world hardest hit by the AIDS pandemic.

An initial MEDLINE database search for international collaborative partnerships dedicated to AIDS malignancies in developing countries failed to identify any leads. This search prompted us to report progress on our collaboration in this aspect of the epidemic. Building on the formal Uganda-Case Western Reserve University (Case) Research Collaboration dating back to 1987, established NIH-supported centers of research excellence at Case, and expanding activities in Kenya, scientific and training initiatives, research capital amongst our institutions are emerging to sustain a international research enterprise focused on AIDS and other viral-related malignancies.