Uptake of home-based voluntary HIV testing in sub-Saharan Africa: a systematic review and meta-analysis

Improving access to HIV testing is a key priority in scaling up HIV treatment and prevention services. Home-based voluntary counselling and testing (HBT) as an approach to delivering wide-scale HIV testing is explored here

Assessment of knowledge, attitudes and practices of infant feeding in the context of HIV: A case study from western Kenya

Guidelines for infant feeding options among HIV-positive mothers are changing with informative research. Cultural factors, socialisation processes, gender dimensions and socio-economic status within communities should be considered in recommending feasible and sustainable options. The objective of this study was to assess the knowledge, attitudes and practices with regards to infant feeding in the context of HIV. A cross-sectional study was conducted between November 2003 and January 2004. The study was carried out in Kosirai Division, Nandi-North District, in western Kenya. The target population was community members aged 18 - 45 years and key informants aged 18 years and above. Structured questionnaires and in-depth interviews were used to collect data. Multistage and snowball sampling methods were used to identify study participants. Quantitative data were analysed using the SPSS statistical package for social scientists (Version 12). Cross-tabulations were calculated and Pearson’s chi-square test used to test significance of relationships between categorical variables. Recorded qualitative data were transcribed and coded. Themes were developed and integrated. A generation of concepts was used to organise the presentation into summaries, interpretations and text. A total of 385 individuals participated in the survey, 50% of whom were women. There were 30 key informants. Farming was the main source of income but half of the women (49.7%) had no income. Most of the respondents (85.5%) knew of breastfeeding as a route of HIV transmission with sex (p=0.003) and age (p=0.000) being highly associated with this knowledge. Breastfeeding wasthe norm although exclusive breastfeeding was not practised. Cow’s milk, the main breast milk substitute, was reported as being given to infants as early as two weeks. It was the most popular (93.5%) infant feeding option in the context of HIV/AIDS. Heating expressed milk, wet nursing and milk banks were least preferred. Thus, the social, cultural and psychological complexity of infant feeding practices should be taken into account when advocating appropriate infant feeding options. Further research is required to determine the safety of using cow’s milk as an infant feeding option. Community engagement, including education and awareness strategies, specific to the benefits of exclusive breastfeeding as a mechanism to reduce the risk of HIV transmission is urgently needed

KENYAN PURPLE TEA ANTHOCYANINS ABILITY TO CROSS THE BLOOD BRAIN BARRIER REINFORCING BRAIN ANTIOXIDANT CAPACITY IN MICE

Studies on antioxidants as neuroprotective agents have been hampered by the impermeability of the blood brain barrier (BBB) to many compounds. However, previous studies have shown that a group of tea ( Camellia sinensis ) flavonoids, the catechins, are brain permeable and neuroprotective. Despite this remarkable observation, there exists no data on the bioavailability and pharmacological benefits of tea anthocyanins (ACNs) in the brain tissue. This study investigated the ability of Kenyan purple tea ACNs to cross the BBB and boost the brain antioxidant capacity. Mice were orally administered with purified and characterised Kenyan purple tea ACNs or a combination of Kenyan purple tea ACN\u2019s and coenzyme-Q10, at a dose of 200 mg kg-1 body weight in an experiment that lasted for 15 days. Twenty four hours post the last dosage of antioxidants, CO2 was used to euthenise the mice. Then the brain was excised and used for various biochemical analyses. Kenyan purple tea ACNs significantly (P<0.05) raised brain Glutathione (GSH) levels, implying a boost in brain antioxidant capacity. Notably, ACN metabolites were detected in brain tissue of ACN fed mice. This is the first demonstration that Kenyan purple tea ACNs can cross the BBB, reinforcing the brain\u2019s antioxidant capacity. Hence, there is need to study ACNs as suitable candidates for dietary supplements that could support antioxidant capacity in the brain and have potential to provide neuroprotection in neurodegenerative conditions.Les \ue9tudes sur les antioxydants comme agents neuroprotecteurs ont \ue9t\ue9 handicap\ue9es par l\u2019imperm\ue9abilit\ue9 de la barri\ue8re de sang du cerveau (BBB) \ue0 plusieurs produits. Par ailleurs, les \ue9tudes ant\ue9rieurs ont montr\ue9 qu\u2019un groupe de flavono\uefdes du th\ue9 ( Camellia sinensis ) , les cat\ue9chines, permettent la perm\ue9abilit\ue9 du cerveau et prot\ue8gent les nerfs. Malgr\ue9 cette observation importante, il n\u2019ya pas de donn\ue9es sur la biodisponibilit\ue9 et les vertus pharmacologiques des anthocyanines du th\ue9 (ACNs) dans le tissue du cerveau. Cette \ue9tude a \ue9valu\ue9 l\u2019aptitude des anthocyanines du th\ue9 pourpre du Kenya de traverser le BBB et am\ue9liorer la capacit\ue9 antioxydante du cerveau. Des rats \ue9taient oralement administr\ue9s des anthocianines du th\ue9 pourpre purifi\ue9s et caract\ue9ris\ue9s ou une combinaison des ACNs avec le coenzyme-Q10, \ue0 une dose de 200 mg kg-1 de poids vif dans un essai d\u2019une dur\ue9e de 15 jours. Vingt quatre heures apr\ue8s le dernier dosage d\u2019antioxydants, le CO2 \ue9tait utilis\ue9 pour euthanasier les rats. Ensuite, le cerveau \ue9tait excis\ue9 et soumis \ue0 diverses analyses biochimiques. Les ACNs ont augment\ue9 significativement (P<0.05) les niveaux du Glutathione (GSH) du cerveau,,ce qui implique une am\ue9lioration de la capacit\ue9 antioxydante du cerveau. Remarquablement, les m\ue9tabolites ACN \ue9taient d\ue9tect\ue9s dans le tissu des rats nourris aux ACNs. Ceci est la premi\ue8re d\ue9monstration que les anthocyanines (ACNs) du th\ue9 pourpre Kenyan peuvent franchir la barri\ue8re h\ue9mato-enc\ue9phalique (BHE), renfor\ue7ant ainsi la capacit\ue9 antioxydante du cerveau. Ainsi, le besoin s\u2019impose de les \ue9tudier comme des candidats appropri\ue9s pour les aliments de suppl\ue9ment qui pourraient renforcer la capacit\ue9 antioxydante dans le cerveau et avoir le potentiel d\u2019offrir la neuroprotection dans les conditions neurod\ue9g\ue9n\ue9ratrices

Repellency and composition of essential oils of selected ethnobotanical plants used in Western Kenya against bites of Anopheles gambiae Sensu Stricto

The essential oils of Ocimum gratissimum Linn, Hyptis suaveolens (L) Poit and Vitex keniensis, which are used traditionally in Western Kenya for personal and space protection against mosquito bites, were screened for repellence against Anopheles gambiae Sensu Stricto. Essential oils were extracted from their leaves by hydrodistillation, characterised by gas chromatography linked with mass spectrophotometer and electroantennogram detectors. The repellency of the oils and their selected blends was studied by the reduction in probing and feeding on the human arm. The oils showed promising repellency for Anopheles gambiae, O. gratissimum (RD50 = 2.77 × 10-5 mg cm-2, 95% CI), Vitex keniensis (RD = 5.68 × 10-5 mg cm-2) and Hyptis suaveolens (6.27× 10-5 mg cm-2) as compared to that of DEET (control) RD = 1.25×10-5 mg cm-2). The bioactive constituents of each oil were identified by Gas chromatography-linked with Mass spectrometry and Electroantennography. Some compounds were confirmed by co-injections of the oil with available authentic standards. The results provide a scientific rationale for the traditional use of these plants in repelling disease vectors and other biting insects, and lay down some useful groundwork for downstream development of more effective products for personal and space protection

Research Infrastructure Core Facilities at Research Centers in Minority Institutions: Part I-Research Resources Management, Operation, and Best Practices

Funded by the National Institutes of Health (NIH), the Research Centers in Minority Institutions (RCMI) Program fosters the development and implementation of innovative research aimed at improving minority health and reducing or eliminating health disparities. Currently, there are 21 RCMI Specialized (U54) Centers that share the same framework, comprising four required core components, namely the Administrative, Research Infrastructure, Investigator Development, and Community Engagement Cores. The Research Infrastructure Core (RIC) is fundamentally important for biomedical and health disparities research as a critical function domain. This paper aims to assess the research resources and services provided and evaluate the best practices in research resources management and networking across the RCMI Consortium. We conducted a REDCap-based survey and collected responses from 57 RIC Directors and Co-Directors from 98 core leaders. Our findings indicated that the RIC facilities across the 21 RCMI Centers provide access to major research equipment and are managed by experienced faculty and staff who provide expert consultative and technical services. However, several impediments to RIC facilities operation and management have been identified, and these are currently being addressed through implementation of cost-effective strategies and best practices of laboratory management and operation

Effects of co-habitation between Anopheles gambiae s.s. and Culex quinquefasciatus aquatic stages on life history traits

<p>Abstract</p> <p>Background</p> <p>The effective measures for the control of malaria and filariasis vectors can be achieved by targeting immature stages of anopheline and culicine mosquitoes in productive habitat. To design this strategy, the mechanisms (like biotic interactions with conspecifc and heterospecific larvae) regulating mosquito aquatic stages survivorship, development time and the size of emerging adults should be understood. This study explored the effect of co-habitation between <it>An. gambiae </it>s.s. and <it>Cx. quinquefasciatus </it>on different life history traits of both species under different densities and constant food supply in the habitats of the same size under semi-natural conditions.</p> <p>Methods</p> <p>Experiments were set up with three combinations; <it>Cx. quinquefasciatus </it>alone (single species treatment), <it>An. gambiae </it>s.s. alone (single species treatment); and <it>An. gambiae </it>s.s. with <it>Cx. quiquefasciatus </it>(co-habitation treatment) in different densities in semi field situation.</p> <p>Results</p> <p>The effect of co-habitation of <it>An. gambiae </it>s.s. and <it>Cx. quinquefasciatus </it>was found to principally affect three parameters. The wing-lengths (a proxy measure of body size) of <it>An. gambiae </it>s.s. in co-habitation treatments were significantly shorter in both females and males than in <it>An. gambiae </it>s.s single species treatments. In <it>Cx. quinquefasciatus</it>, no significant differences in wing-length were observed between the single species and co-habitation treatments. Daily survival rates were not significantly different between co-habitation and single species treatments for both <it>An. gambiae </it>s.s. and <it>Cx. quinquefasciatus</it>. Developmental time was found to be significantly different with single species treatments developing better than co-habitation treatments. Sex ratio was found to be significantly different from the proportion of 0.5 among single and co-habitation treatments species at different densities. Single species treatments had more males than females emerging while in co-habitation treatments more females emerged than males. In this study, there was no significant competitive survival advantage in co-habitation.</p> <p>Conclusion</p> <p>These results suggest that co-habitation of <it>An. gambiae </it>s.s. and <it>Cx. quinquefasciatus </it>in semi-natural conditions affect mostly <it>An. gambiae </it>s.s. body size. Hence, more has to be understood on the effects of co-habitation of <it>An. gambiae </it>s.s. and <it>Cx. quinquefasciatus </it>in a natural ecology and its possible consequences in malaria and filariasis epidemiology.</p