Short term micronutrient-antioxidant supplementation has no impact on a serological marker of gastric atrophy in Zambian adults: retrospective analysis of a randomised controlled trial

BACKGROUND: Gastric cancer is a major contributor to cancer deaths in Zambia but, as elsewhere, no preventive strategies have been identified. We set out to investigate the possibility of reducing gastric atrophy, a premalignant lesion, using micronutrient-antioxidant supplementation. METHODS: We analysed 215 archival samples from a randomised controlled trial of micronutrient-antioxidant supplementation carried out from 2003 to 2006. Participants were randomised to receive either the supplement or placebo and had been taking the allocated intervention for a mean of 18 (range 14–27) months when the samples used in this study were taken. We used low pepsinogen 1 to 2 (PEP1:2) ratio as a surrogate marker of gastric atrophy. A PEP 1:2 ratio of less than three was considered low. HIV serology, age, nutritional status, smoking, alcohol intake and gastric pH were also analysed. Ethical approval was obtained from the University of Zambia Biomedical Research Ethics Committee (011-04-12). The randomized trial was registered (ISRCTN31173864). RESULTS: The overall prevalence of low PEP 1:2 ratio was 15/215 (7%) and it did not differ between the placebo (8/103, 7.8%) and micronutrient groups (7/112, 6.3%; HR 1.24; 95% CI 0.47-3.3; P = 0.79). The presence of low PEP 1:2 ratio was not influenced by HIV infection (HR 1.07; 95% CI 0.37-3.2; P =0.89) or nutritional status but it inversely correlated with gastric pH (Spearman’s rho = -0.34; P = 0.0001). Age above 40 years was associated with atrophy, but neither alcohol nor smoking had any influence. CONCLUSION: Short term micronutrient supplementation does not have any impact on PEP 1:2 ratio, a serological marker of gastric atrophy. PEP 1:2 ratio inversely correlates with gastric pH

Pre-service science teachers’ understanding of science and engineering practices, engineering design process, and scientific method

This study examined secondary pre-service science teachers’ understanding of science and engineering practices, the engineering design process, and the scientific method before and after an intervention. Participants were ten pre-service science teachers. Data were collected through a survey and semi-structured interviews. Results show that after the intervention pre- service science teachers developed understanding of science and engineering practices and used more engineering-specific language when describing them. They also developed an understanding that both engineering design process and scientific method are cyclical and iterative and that the two processes share many practices, but the biggest difference between them is in their purposes. Pre-service teachers also said that the redesign process in engineering design, and the repetition of steps can occur at any point in engineering design process and scientific method. These findings have implications for science teacher education, and teaching and learning of science and engineering design in schools

Experiences of teachers and community health workers implementing sexuality and life skills education in youth clubs in Zambia

Zambia, like other low- and middle-income countries, faces numerous adolescent sexual and reproductive health challenges such as teenage pregnancies. This study aimed at understanding teachers' and community health workers' (CHWs) implementation of comprehensive sexuality education (CSE) as part of a comprehensive support package for adolescent girls to prevent early childbearing. Data collected using in-depth interviews [n = 28] with teachers [n = 15] and community health workers [n = 13] were analysed using thematic analysis. The teachers and CHWs reported that the use of participatory approaches and collaboration between them in implementing CSE enabled them to increase girls' and boys' participation youth clubs. However, some teachers and CHWs experienced practical challenges with the manuals because some concepts were difficult to understand and translate into local language. The participants perceived that the youth club increased knowledge on CSE, assertiveness and self-esteem among the learners. Training and providing a detailed teaching manual with participatory approaches for delivering CSE, and collaborative teaching enabled teachers and CHWs to easily communicate sensitive SRH topics to the learners. However, for the adoption of CSE to be even more successful, piloting of the curriculum with local facilitators and translating the manuals into the local languages before they are implemented, is recommended.acceptedVersio

Severe hypotonia and developmental delay due to an EBF3 pathogenic variant: Clinical implications of a molecular defect and narrative review

peer reviewedHypotonia Ataxia and Delayed Development Syndrome (HADDS) is a neurodevelopmental syndrome due to missense pathogenic variants of the EBF3 gene, located on chromosome 10q26.3. In most cases, these variants appear de novo and the transmission is autosomal dominant. HADDS would affect about 200 people worldwide and is characterized by a high clinical variability in the expression of these different symptoms : severe hypotonia, failure to thrive, psychomotor delay, digestive and feeding disorders, vesicoureteral anomalies, strabismus, and moderate facial dysmorphia. Although our knowledge is still limited, the significance of these symptoms seems to depend upon the EBF3 expression during embryogenesis. Animal studies suggest that EBF3 plays a critical role in neuronal migration and differentiation and interacts with CDKN1A, NeuroD, and ARX regulation pathways. With respect to diaphragmatic and vesicoureteral dysfunction and hypotonia, EBF3 appears to be involved in myocyte calcium metabolism. In addition, EBF3 has recently been identified as a novel tumor suppressor gene in some cancers. Further research on the EBF3 gene and the associated pathological pathways is needed to improve our understanding of HADDS and to provide appropriate care for such rare diseases

Prevalence of obesity, diabetes mellitus, hypertension and associated risk factors in a mining workforce, Democratic Republic of Congo

Introduction: The burden of non-communicable diseases (NCDs) is increasing in low and middle-income countries (LMIC). According to the World Health Organization (WHO) the largest increase occurs in Africa. Obesity, diabetes mellitus and hypertension (ODH) are major risk factors for cardiovascular diseases, causing nearly 18 million deaths worldwide. Various risks associated with mining as an occupational activity are implicated in NCDs' occurrence. This study describes the baseline prevalence of ODH and associated risk factors in the workforce of Tenke Fungurume Mining (TFM), in southern Democratic Republic of Congo. Methods: A cross-sectional study was conducted on a sample of 2,749 employees' and contractor's occupational health examination files for 2010. Socio-demographic, occupational, medical, anthropometric and behavioral characteristics were collected and assessed. Disease status regards ODH was based on WHO criteria. A multivariate logistic regression model was used. Results: Overall prevalence of ODH was 4.5%, 11.7%, and 18.2% respectively. Proportions of pre-ODH individuals were 19.7%, 16.5%, and 47.8% respectively. Prevalence of ODH increased with age, professional grade, nature of work, gender and reported alcohol use. Smoking 10 or more cigarettes per day increased risk of diabetes and hypertension, while decreasing obesity. Conclusion: Rates of ODH and associated risk factors are higher in the TFM workforce, than in the general DRC population. This is likely reflective of other mining sites in the country and region. It is evident that ODH are associated with various socio-demographic, occupational, anthropometric, biomedical and behavioral risk factors. A NCD prevention program and close monitoring of disease and risk factors trends are needed in this population

Improving validity of informed consent for biomedical research in Zambia using a laboratory exposure intervention.

BACKGROUND: Complex biomedical research can lead to disquiet in communities with limited exposure to scientific discussions, leading to rumours or to high drop-out rates. We set out to test an intervention designed to address apprehensions commonly encountered in a community where literacy is uncommon, and where complex biomedical research has been conducted for over a decade. We aimed to determine if it could improve the validity of consent. METHODS: Data were collected using focus group discussions, key informant interviews and observations. We designed an intervention that exposed participants to a detailed demonstration of laboratory processes. Each group was interviewed twice in a day, before and after exposure to the intervention in order to assess changes in their views. RESULTS: Factors that motivated people to participate in invasive biomedical research included a desire to stay healthy because of the screening during the recruitment process, regular advice from doctors, free medical services, and trust in the researchers. Inhibiting factors were limited knowledge about samples taken from their bodies during endoscopic procedures, the impact of endoscopy on the function of internal organs, and concerns about the use of biomedical samples. The belief that blood can be used for Satanic practices also created insecurities about drawing of blood samples. Further inhibiting factors included a fear of being labelled as HIV positive if known to consult heath workers repeatedly, and gender inequality. Concerns about the use and storage of blood and tissue samples were overcome by a laboratory exposure intervention. CONCLUSION: Selecting a group of members from target community and engaging them in a laboratory exposure intervention could be a useful tool for enhancing specific aspects of consent for biomedical research. Further work is needed to determine the extent to which improved understanding permeates beyond the immediate group participating in the intervention

The skin is a significant but overlooked anatomical reservoir for vector-borne African trypanosomes

The role of mammalian skin in harbouring and transmitting arthropod-borne protozoan parasites has been overlooked for decades as these pathogens have been regarded primarily as blood-dwelling organisms. Intriguingly, infections with low or undetected blood parasites are common, particularly in the case of Human African Trypanosomiasis caused by Trypanosoma brucei gambiense. We hypothesise, therefore, the skin represents an anatomic reservoir of infection. Here we definitively show that substantial quantities of trypanosomes exist within the skin following experimental infection, which can be transmitted to the tsetse vector, even in the absence of detectable parasitaemia. Importantly, we demonstrate the presence of extravascular parasites in human skin biopsies from undiagnosed individuals. The identification of this novel reservoir requires a re-evaluation of current diagnostic methods and control policies. More broadly, our results indicate that transmission is a key evolutionary force driving parasite extravasation that could further result in tissue invasion-dependent pathology

Actigraphy in Human African Trypanosomiasis as a Tool for Objective Clinical Evaluation and Monitoring: A Pilot Study

The clinical picture of the parasitic disease human African trypanosomiasis (HAT, also called sleeping sickness) is dominated by sleep alterations. We here used actigraphy to evaluate patients affected by the Gambiense form of HAT. Actigraphy is based on the use of battery-run, wrist-worn devices similar to watches, widely used in middle-high income countries for ambulatory monitoring of sleep disturbances. This pilot study was motivated by the fact that the use of polysomnography, which is the gold standard technology for the evaluation of sleep disorders and has greatly contributed to the objective identification of signs of disease in HAT, faces tangible challenges in resource-limited countries where the disease is endemic. We here show that actigraphy provides objective data on the severity of sleep-wake disturbances that characterize HAT. This technique, which does not disturb the patient's routine activities and can be applied at home, could therefore represent an interesting, non-invasive tool for objective HAT clinical assessment and long-term monitoring under field conditions. The use of this method could provide an adjunct marker of HAT severity and for treatment follow-up, or be evaluated in combination with other disease biomarkers in body fluids that are currently under investigation in many laboratories

Proceedings of an expert workshop on community agreement for gene drive research in Africa - Co-organised by KEMRI, PAMCA and Target Malaria.

Gene drive research is progressing towards future field evaluation of modified mosquitoes for malaria control in sub-Saharan Africa. While many literature sources and guidance point to the inadequacy of individual informed consent for any genetically modified mosquito release, including gene drive ones, (outside of epidemiological studies that might require blood samples) and at the need for a community-level decision, researchers often find themselves with no specific guidance on how that decision should be made, expressed and by whom. Target Malaria, the Kenya Medical Research Institute and the Pan African Mosquito Control Association co-organised a workshop with researchers and practitioners on this topic to question the model proposed by Target Malaria in its research so far that involved the release of genetically modified sterile male mosquitoes and how this could be adapted to future studies involving gene drive mosquito releases for them to offer reflections about potential best practices. This paper shares the outcomes of that workshop and highlights the remaining topics for discussion before a comprehensive model can be designed