Comparison of PCR-RFLP and Genescan-based genotyping for analyzing infection dynamics of Plasmodium falciparum.

Parameters describing the infection dynamics of Plasmodium falciparum are important determinants of the potential impact of interventions and are potential outcome measurements for malaria intervention trials. Low parasite densities, periodic sequestration of parasites, and the presence of multiple concurrent infections make it essential to use molecular techniques to estimate the force of infection and duration of infections in endemic areas. We now compare two approaches for tracking individual genotypes of the highly polymorphic merozoite surface protein 2: 1) fluorescence-labeled polymerase chain reaction (PCR) and GeneScan-sizing and 2) restriction fragment length polymorphism (RFLP). We analyze samples from a longitudinal field study in Ghana and use statistical approaches that allow for imperfect detectability. The two methods gave broadly similar estimates of parasite dynamics, but GeneScan is more precise and can achieve a higher throughput. The analysis of parasite dynamics indicated an average duration of infection of 210 days by GeneScan versus 152 days by PCR-RFLP in the study population in Kassena-Nankana, Northern Ghana. This reflects the good performance of GeneScan-based genotyping for studies of parasite infection dynamics

Misclassification of Plasmodium infections by conventional microscopy and the impact of remedial training on the proficiency of laboratory technicians in species identification.

BACKGROUND: Malaria diagnosis is largely dependent on the demonstration of parasites in stained blood films by conventional microscopy. Accurate identification of the infecting Plasmodium species relies on detailed examination of parasite morphological characteristics, such as size, shape, pigment granules, besides the size and shape of the parasitized red blood cells and presence of cell inclusions. This work explores misclassifications of four Plasmodium species by conventional microscopy relative to the proficiency of microscopists and morphological characteristics of the parasites on Giemsa-stained blood films. CASE DESCRIPTION: Ten-day malaria microscopy remedial courses on parasite detection, species identification and parasite counting were conducted for public health and research laboratory personnel. Proficiency in species identification was assessed at the start (pre) and the end (post) of each course using known blood films of Plasmodium falciparum, Plasmodium malariae, Plasmodium ovale and Plasmodium vivax infections with densities ranging from 1,000 to 30,000 parasites/μL. Outcomes were categorized as false negative, positive without speciation, P. falciparum, P. malariae, P. ovale, P. vivax and mixed infections. DISCUSSION AND EVALUATION: Reported findings are based on 1,878 P. falciparum, 483 P. malariae, 581 P. ovale and 438 P. vivax cumulative results collated from 2008 to 2010 remedial courses. Pre-training false negative and positive misclassifications without speciation were significantly lower on P. falciparum infections compared to non-falciparum infections (p < 0.0001). Post-training misclassifications decreased significantly compared to pre- training misclassifications which in turn led to significant improvements in the identification of the four species. However, P. falciparum infections were highly misclassified as mixed infections, P. ovale misclassified as P. vivax and P. vivax similarly misclassified as P. ovale (p < 0.05). CONCLUSION: These findings suggest that the misclassification of malaria species could be a common occurrence especially where non-falciparum infections are involved due to lack of requisite skills in microscopic diagnosis and variations in morphological characteristics within and between Plasmodium species. Remedial training might improve reliability of conventional light microscopy with respect to differentiation of Plasmodium infections

Obesity and type 2 diabetes in sub-Saharan Africans - Is the burden in today's Africa similar to African migrants in Europe? The RODAM study.

BACKGROUND: Rising rates of obesity and type 2 diabetes (T2D) are impending major threats to the health of African populations, but the extent to which they differ between rural and urban settings in Africa and upon migration to Europe is unknown. We assessed the burden of obesity and T2D among Ghanaians living in rural and urban Ghana and Ghanaian migrants living in different European countries. METHODS: A multi-centre cross-sectional study was conducted among Ghanaian adults (n = 5659) aged 25-70 years residing in rural and urban Ghana and three European cities (Amsterdam, London and Berlin). Comparisons between groups were made using prevalence ratios (PRs) with adjustments for age and education. RESULTS: In rural Ghana, the prevalence of obesity was 1.3 % in men and 8.3 % in women. The prevalence was considerably higher in urban Ghana (men, 6.9 %; PR: 5.26, 95 % CI, 2.04-13.57; women, 33.9 %; PR: 4.11, 3.13-5.40) and even more so in Europe, especially in London (men, 21.4 %; PR: 15.04, 5.98-37.84; women, 54.2 %; PR: 6.63, 5.04-8.72). The prevalence of T2D was low at 3.6 % and 5.5 % in rural Ghanaian men and women, and increased in urban Ghanaians (men, 10.3 %; PR: 3.06; 1.73-5.40; women, 9.2 %; PR: 1.81, 1.25-2.64) and highest in Berlin (men, 15.3 %; PR: 4.47; 2.50-7.98; women, 10.2 %; PR: 2.21, 1.30-3.75). Impaired fasting glycaemia prevalence was comparatively higher only in Amsterdam, and in London, men compared with rural Ghana. CONCLUSION: Our study shows high risks of obesity and T2D among sub-Saharan African populations living in Europe. In Ghana, similarly high prevalence rates were seen in an urban environment, whereas in rural areas, the prevalence of obesity among women is already remarkable. Similar processes underlying the high burden of obesity and T2D following migration may also be at play in sub-Saharan Africa as a consequence of urbanisation

Food variety, dietary diversity, and type 2 diabetes in a multi-center cross-sectional study among Ghanaian migrants in Europe and their compatriots in Ghana: the RODAM study.

PURPOSE: The importance of dietary diversification for type 2 diabetes (T2D) risk remains controversial. We investigated associations of between- and within-food group variety with T2D, and the role of dietary diversification for the relationships between previously identified dietary patterns (DPs) and T2D among Ghanaian adults. METHODS: In the multi-center cross-sectional Research on Obesity and Diabetes among African Migrants (RODAM) Study (n = 3810; Ghanaian residence, 56%; mean age, 46.2 years; women, 63%), we constructed the Food Variety Score (FVS; 0-20 points), the Dietary Diversity Score (DDS; 0-7 points), and the Diet Quality Index-International (DQI-I) variety component (0-20 points). The associations of these scores, of a "rice, pasta, meat and fish" DP, of a "mixed" DP, and of a "roots, tubers and plantain" DP with T2D were calculated by logistic regression. RESULTS: The FVS was inversely associated with T2D, adjusted for socio-demographic, lifestyle, and anthropometric factors [odds ratio (OR) for T2D per 1 standard deviation (SD) increase: 0.81; 95% confidence interval (CI) 0.71-0.93]. The DDS and the DQI-I variety component were not associated with T2D. There was no association of the "mixed" DP and the "roots, tubers and plantain" DP with T2D. Yet, the "rice, pasta, meat and fish" DP is inversely associated with T2D (OR for T2D per 1 SD increase: 0.82; 95% CI 0.71-0.95); this effect was slightly attenuated by the FVS. CONCLUSIONS: In this Ghanaian population, between-food group variety may exert beneficial effects on glucose metabolism and partially explains the inverse association of the "rice, pasta, meat and fish" DP with T2D

Evaluation of the Safety and Immunogenicity of the RTS,S/AS01E Malaria Candidate Vaccine When Integrated in the Expanded Program of Immunization

Background. The RTS,S/AS01E malaria candidate vaccine is being developed for immunization of African infants through the Expanded Program of Immunization (EPI). Methods. This phase 2, randomized, open, controlled trial conducted in Ghana, Tanzania, and Gabon evaluated the safety and immunogenicity of RTS,S/AS01E when coadministered with EPI vaccines. Five hundred eleven infants were randomized to receive RTS,S/AS01E at 0, 1, and 2 months (in 3 doses with diphtheria, tetanus, and wholecell pertussis conjugate [DTPw]; hepatitis B [HepB]; Haemophilus influenzae type b [Hib]; and oral polio vaccine [OPV]), RTS,S/AS01E at 0, 1, and 7 months (2 doses with DTPwHepB/Hib+OPV and 1 dose with measles and yellow fever), or EPI vaccines only. Results. The occurrences of serious adverse events were balanced across groups; none were vaccine-related. One child from the control group died. Mild to moderate fever and diaper dermatitis occurred more frequently in the RTS,S/AS01E coadministration groups. RTS,S/AS01E generated high anti-circumsporozoite protein and anti- hepatitis B surface antigen antibody levels. Regarding EPI vaccine responses upon coadministration when considering both immunization schedules, despite a tendency toward lower geometric mean titers to some EPI antigens, predefined noninferiority criteria were met for all EPI antigens except for polio 3 when EPI vaccines were given with RTS,S/AS01E at 0, 1, and 2 months. However, when antibody levels at screening were taken into account, the rates of response to polio 3 antigens were comparable between groups. Conclusion. RTS,S/AS01E integrated in the EPI showed a favorable safety and immunogenicity evaluation. Trial registration. ClinicalTrials.gov identifier: NCT00436007. GlaxoSmithKline study ID number: 106369 (Malaria-050

Cardiovascular disease risk prediction in sub-Saharan African populations - Comparative analysis of risk algorithms in the RODAM study.

BACKGROUND: Validated absolute risk equations are currently recommended as the basis of cardiovascular disease (CVD) risk stratification in prevention and control strategies. However, there is no consensus on appropriate equations for sub-Saharan African populations. We assessed agreement between different cardiovascular risk equations among Ghanaian migrant and home populations with no overt CVD. METHODS: The 10-year CVD risks were calculated for 3586 participants aged 40-70years in the multi-centre RODAM study among Ghanaians residing in Ghana and Europe using the Framingham laboratory and non-laboratory and Pooled Cohort Equations (PCE) algorithms. Participants were classified as low, moderate or high risk, corresponding to 20% respectively. Agreement between the risk algorithms was assessed using kappa and correlation coefficients. RESULTS: 19.4%, 12.3% and 5.8% were ranked as high 10-year CVD risk by Framingham non-laboratory, Framingham laboratory and PCE, respectively. The median (25th-75th percentiles) estimated 10-year CVD risk was 9.5% (5.4-15.7), 7.3% (3.9-13.2) and 5.0% (2.3-9.7) for Framingham non-laboratory, Framingham laboratory and PCE, respectively. The concordance between PCE and Framingham non-laboratory was better in the home Ghanaian population (kappa=0.42, r=0.738) than the migrant population (kappa=0.24, r=0.732) whereas concordance between PCE and Framingham laboratory was better in migrant Ghanaians (kappa=0.54, r=0.769) than the home population (kappa=0.51, r=0.758). CONCLUSION: CVD prediction with the same algorithm differs for the migrant and home populations and the interchangeability of Framingham laboratory and non-laboratory algorithms is limited. Validation against CVD outcomes is needed to inform appropriate selection of risk algorithms for use in African ancestry populations

Inovação verde e desempenho sustentável: Uma análise bibliométrica

Objective of the study: The study aimed to analyze the literature on green innovation and sustainable performance to identify past trends and develop future research trends.Methodology/approach: This study uses bibliometric analysis to examine green innovation and sustainable performance papers. Using the Web of Science database, 647 empirical and review papers were collected from 2011 to March 2024. The Biblioshiny package in “R” was used to analyze the documents, focusing on performance, visualization, and mapping metrics. Originality/relevance: This paper summarizes and integrates the literature that explicitly relates green innovation and sustainable performance, beyond the previously conducted literature that dealt with each construct separately. Main results: The study revealed that, despite extensive research on the topic of green innovation, direct links to sustainable performance remain scarce and disproportionate in various aspects. Environmental outcomes dominate the literature, whereas social and economic aspects are underrepresented. The dominant nation in terms of publication output and influence was China. Theoretical/management contributions: This study shows that the theoretical development of green innovation and sustainable performance is incomplete. While environmental aspects are well theorized, social and economic dimensions remain underdeveloped. The results highlight the need to broaden perspectives by incorporating regulatory contexts, organizational capabilities, and knowledge management. Social/management contributions: For managers, the study offers practical guidance on strategically integrating green innovation into operations. Aligning innovation with sustainability objectives strengthens competitiveness and stakeholder trust. The findings emphasize adapting strategies to institutional and policy contexts and investing in training and development to enhance organizational capacity and sustainability performance.Objetivo del estudio: El objetivo de este estudio fue analizar la literatura sobre innovación verde y desempeño sostenible para identificar tendencias pasadas y proponer líneas de investigación futuras. Metodología/enfoque: Este estudio utiliza un análisis bibliométrico para examinar los artículos sobre innovación verde y desempeño sostenible. A partir de la base de datos Web of Science, se recopilaron 647 artículos empíricos y de revisión publicados entre 2011 y marzo de 2024. El paquete Biblioshiny del software R se empleó para analizar los documentos, centrándose en métricas de desempeño, visualización y mapeo. Originalidad/relevancia: Este artículo sintetiza e integra la literatura que relaciona explícitamente la innovación verde con el desempeño sostenible, superando los estudios previos que abordaron cada constructo por separado. Principales resultados: El estudio reveló que, a pesar de la amplia cantidad de investigaciones sobre innovación verde, las conexiones directas con el desempeño sostenible siguen siendo escasas y desproporcionadas en varios aspectos. Los resultados ambientales predominan en la literatura, mientras que las dimensiones social y económica están subrepresentadas. China fue el país dominante en términos de producción científica e influencia. Contribuciones teóricas/gerenciales: Este estudio demuestra que el desarrollo teórico sobre innovación verde y desempeño sostenible aún es incompleto. Si bien los aspectos ambientales están bien fundamentados, las dimensiones social y económica requieren mayor desarrollo. Los resultados resaltan la necesidad de ampliar las perspectivas teóricas incorporando los contextos regulatorios, las capacidades organizacionales y la gestión del conocimiento. Contribuciones sociales/gerenciales: Para los directivos, el estudio ofrece orientaciones prácticas sobre cómo integrar estratégicamente la innovación verde en las operaciones empresariales. Alinear la innovación con los objetivos de sostenibilidad fortalece la competitividad y la confianza de las partes interesadas. Los hallazgos subrayan la importancia de adaptar las estrategias a los contextos institucionales y normativos, e invertir en capacitación y desarrollo para mejorar la capacidad organizacional y el desempeño sostenible.Objetivo do estudo: O estudo teve como objetivo analisar a literatura sobre inovação verde e desempenho sustentável, a fim de identificar tendências passadas e propor direções para pesquisas futuras. Metodologia/abordagem: Este estudo utiliza a análise bibliométrica para examinar artigos sobre inovação verde e desempenho sustentável. A partir da base de dados Web of Science, foram coletados 647 artigos empíricos e de revisão publicados entre 2011 e março de 2024. O pacote Biblioshiny do software R foi utilizado para analisar os documentos, com foco em métricas de desempenho, visualização e mapeamento. Originalidade/relevância: Este artigo sintetiza e integra a literatura que relaciona explicitamente a inovação verde ao desempenho sustentável, indo além dos estudos anteriores que abordaram cada constructo de forma isolada. Principais resultados: O estudo revelou que, apesar do vasto volume de pesquisas sobre inovação verde, as conexões diretas com o desempenho sustentável ainda são escassas e desproporcionais em vários aspectos. Os resultados ambientais predominam na literatura, enquanto as dimensões social e econômica permanecem sub-representadas. A China destacou-se como o país com maior produção e influência científica. Contribuições teóricas/gerenciais: Este estudo demonstra que o desenvolvimento teórico sobre inovação verde e desempenho sustentável ainda é incompleto. Embora os aspectos ambientais estejam bem fundamentados, as dimensões social e econômica carecem de maior aprofundamento. Os resultados ressaltam a necessidade de ampliar as perspectivas teóricas incorporando contextos regulatórios, capacidades organizacionais e gestão do conhecimento. Contribuições sociais/gerenciais: Para os gestores, o estudo oferece orientações práticas sobre como integrar estrategicamente a inovação verde às operações empresariais. Alinhar a inovação aos objetivos de sustentabilidade fortalece a competitividade e a confiança das partes interessadas. As conclusões enfatizam a importância de adaptar as estratégias aos contextos institucionais e de política pública, além de investir em capacitação e desenvolvimento para aprimorar a capacidade organizacional e o desempenho sustentável

Clinical features, proximate causes, and consequences of active convulsive epilepsy in Africa.

PURPOSE: Epilepsy is common in sub-Saharan Africa (SSA), but the clinical features and consequences are poorly characterized. Most studies are hospital-based, and few studies have compared different ecological sites in SSA. We described active convulsive epilepsy (ACE) identified in cross-sectional community-based surveys in SSA, to understand the proximate causes, features, and consequences. METHODS: We performed a detailed clinical and neurophysiologic description of ACE cases identified from a community survey of 584,586 people using medical history, neurologic examination, and electroencephalography (EEG) data from five sites in Africa: South Africa; Tanzania; Uganda; Kenya; and Ghana. The cases were examined by clinicians to discover risk factors, clinical features, and consequences of epilepsy. We used logistic regression to determine the epilepsy factors associated with medical comorbidities. KEY FINDINGS: Half (51%) of the 2,170 people with ACE were children and 69% of seizures began in childhood. Focal features (EEG, seizure types, and neurologic deficits) were present in 58% of ACE cases, and these varied significantly with site. Status epilepticus occurred in 25% of people with ACE. Only 36% received antiepileptic drugs (phenobarbital was the most common drug [95%]), and the proportion varied significantly with the site. Proximate causes of ACE were adverse perinatal events (11%) for onset of seizures before 18 years; and acute encephalopathy (10%) and head injury prior to seizure onset (3%). Important comorbidities were malnutrition (15%), cognitive impairment (23%), and neurologic deficits (15%). The consequences of ACE were burns (16%), head injuries (postseizure) (1%), lack of education (43%), and being unmarried (67%) or unemployed (57%) in adults, all significantly more common than in those without epilepsy. SIGNIFICANCE: There were significant differences in the comorbidities across sites. Focal features are common in ACE, suggesting identifiable and preventable causes. Malnutrition and cognitive and neurologic deficits are common in people with ACE and should be integrated into the management of epilepsy in this region. Consequences of epilepsy such as burns, lack of education, poor marriage prospects, and unemployment need to be addressed

Patient satisfaction with quality of care at out-patient departments in selected health facilities in Kumasi, Ghana

Background: Health care is an indispensable element for economic growth and development of individuals and nations. Healthcare service quality is associated with patient satisfaction, ensuring the safety and security of patients, reducing mortality and morbidity, and improving the quality of life. Patient satisfaction with health service is linked to increased utilization following contendness with healthcare received from health providers. There is an increasing public perception of poor quality of care among patients visiting public health facilities in Ghana which translates into service dissatisfaction. Meanwhile, patient dissatisfaction will more likely result in poor utilization, disregard for medical advice, and treatment non-adherence. The study was conducted to assess patients’ satisfaction with quality of care at the outpatient departments of selected health facilities in Kumasi, Ghana. Methods: An institutional-based analytical cross-sectional study was conducted among patients (aged ≥ 18 years) visiting outpatient departments of selected health facilities in Kumasi from October - December, 2019. A systematic sampling technique was adopted to collect quantitative information from 385 respondents using a structured questionnaire. At 95% confidence interval and 5% alpha level, two-level logistic regression models were performed. Model I estimated the crude associations and the effect of covariates was accounted for in Model II. The results were presented in odds ratio with a corresponding 95% confidence interval. All analysis were performed using STATA statistical software version 16.0. Results: Out of the 385 participants, 90.9% of the participants were satisfied with the services they received. Being married [AOR = 3.06, 95%CI = 1.07–8.74], agreeing that the facility is disability-friendly [AOR = 7.93, 95%CI = 2.07–14.43], facility has directional signs for navigation [AOR = 3.12, 95%=1.92–10.59] and the facility has comfortable and attractive waiting area [AOR = 10.02, 95%CI = 2.35–22.63] were associated with satisfaction with health service among patients. Spending more than 2 h at the health facility [AOR = 0.45, 95%CI = 0.04–0.93] and having perceived rude and irritating provider [AOR = 0.14, 95%CI = 0.04–0.51] had lower odds of satisfaction with health service received. Conclusion: There is a high patient satisfaction with services received at out-patient departments which is influenced by a multiplicity of factors; being married, and agreeing that the facility is disability-friendly, has directional signs for navigation, and the waiting area is comfortable and attractive. The study findings call for the need to develop and implement health delivery interventions and strategies (i.e. patient-centered interventions, disability-friendly facilities, and sustainability and improvement of quality service) to improve and sustain patient satisfaction levels with health care service. These strategies must be directed towards addressing inequalities in infrastructural development and inputs needed for healthcare delivery in the health system

Effects of antiplatelet therapy on stroke risk by brain imaging features of intracerebral haemorrhage and cerebral small vessel diseases: subgroup analyses of the RESTART randomised, open-label trial

Background Findings from the RESTART trial suggest that starting antiplatelet therapy might reduce the risk of recurrent symptomatic intracerebral haemorrhage compared with avoiding antiplatelet therapy. Brain imaging features of intracerebral haemorrhage and cerebral small vessel diseases (such as cerebral microbleeds) are associated with greater risks of recurrent intracerebral haemorrhage. We did subgroup analyses of the RESTART trial to explore whether these brain imaging features modify the effects of antiplatelet therapy