Browsing by Author "Vuai, Said"
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Item The Continued Impacts of the COVID-19 Pandemic on Education and Mental Health Among Sub-Saharan African Adolescents(Elsevier, 2022) Wang, Dongqing; Adedokun, Olufemi A; Millogo, Ourohiré; Madzorera, Isabel; Hemler, Elena C; Workneh, Firehiwot; Mapendo, Frank; Lankoandev, Bruno; Ismail, Abbas; Chukwu, Angela; Assefa, Nega; Watara, Sulemana; Lyatuu, Isaac; Okpara, Daniel; Abdullahi, Yasir Y; Zabre, Pascal; Vuai, Said; Soura, Abdramane BassiahiThis multicountry survey assessed the levels and the determinants of the impacts of the pandemic on education and mental health among adolescents in sub-Saharan Africa and the potential factors that may exacerbate these adverse impacts. A phone survey was conducted among adolescents in nine diverse areas in Burkina Faso, Ethiopia, Ghana, Nigeria, and Tanzania between July and December 2021. Approximately 300 adolescents per area and 2,803 adolescents in total were included. The survey collected information on adolescents’ sociodemographic characteristics, current COVID-19 preventive measures, and the impacts of the pandemic on daily activities, education, and mental health. Log-binomial models were used to calculate the adjusted prevalence ratios (aPRs) for determinants of education and mental health outcomes. Overall, 17% of the adolescents were not receiving any education. Compared to boys, girls were 15% more likely than boys to lack fully in-person education (aPR: 1.15; 95% confidence interval [CI]: 1.02, 1.30). Rural residence was associated with 2.7 times the prevalence of not currently receiving any education (aPR: 2.68; 95% CI: 2.23, 3.22). Self-reported experience of the current impacts of the pandemic on daily activities was associated with a higher prevalence of possible psychological distress (aPR: 1.86; 95% CI: 1.55, 2.24), high anxiety level (aPR: 3.37; 95% CI: 2.25, 5.06), and high depression level (aPR: 3.01; 95% CI: 2.05, 4.41). The COVID-19 pandemic presents continued challenges to adolescents’ education and mental health. Multisectoral efforts are needed to ensure that adolescents in sub-Saharan Africa do not fall further behind due to the pandemicItem Covid-19 preventive practices, psychological distress, and reported barriers to healthcare access during the pandemic among adult community members in sub-Saharan Africa: a phone survey(American Society of Tropical Medicine and Hygiene, 2022) Assefa, Nega; Abdullahi, Yasir Y.; Hemler, Elena C.; Lankoande, Bruno; Madzorera, Isabel; Wang, Dongqing; Ismail, Abbas; Chukwu, Angela; Workneh, Firehiwot; Mapendo, Frank; Millogo, Ourohire; Abubakari, Sulemana Watara; Febir, Lawrence Gyabaa; Lyatuu, Isaac; Dianou, Kassoum; Baernighausen, Till; Soura, Abdramane; Asante, Kwaku Poku; Smith, Emily; Vuai, Said; Worku, Alemayehu; Killewo, Japhet; Mwanyika-Sando, Mary; Berhane, Yemane; Sie, Ali; Tajudeen, Raji; Oduola, Ayo; Fawzi, Wafaie W.The COVID-19 pandemic has had serious negative health and economic impacts in sub-Saharan Africa. Continuous monitoring of these impacts is crucial to formulate interventions to minimize the consequences of COVID-19. This study surveyed 2,829 adults in urban and rural sites among five sub-Saharan African countries: Burkina Faso, Ethiopia, Nigeria, Tanzania, and Ghana. Participants completed a mobile phone survey that assessed self-reported sociodemographic, COVID-19 preventive practices, psychological distress, and barriers to healthcare access. A modified Poisson regression model was used to estimate adjusted prevalence ratios (aPRs) and 95% CIs to investigate potential factors related to psychological distress and barriers to reduced healthcare access. At least 15.6% of adults reported experiencing any psychological distress in the previous 2 weeks, and 10.5% reported that at least one essential healthcare service was difficult to access 2 years into the pandemic. The majority of participants reported using several COVID-19 preventive methods, with varying proportions across the sites. Participants in the urban site of Ouagadougou, Burkina Faso (aPR: 2.29; 95% CI: 1.74–3.03) and in the rural site of Kintampo, Ghana (aPR: 1.68; 95% CI: 1.21–2.34) had a higher likelihood of experiencing any psychological distress compared with those in the rural area of Nouna, Burkina Faso. Loss of employment due to COVID-19 (aPR: 1.77; 95% CI: 1.47–2.11) was also associated with an increased prevalence of psychological distress. The number of children under 5 years in the household (aPR: 1.23; 95% CI: 1.14–1.33) and participant self-reported psychological distress (aPR: 1.83; 95% CI: 1.48–2.27) were associated with an increased prevalence of reporting barriers to accessing health services, whereas wage employment (aPR: 0.67; 95% CI: 0.49–0.90) was associated with decreased prevalence of reporting barriers to accessing health services. Overall, we found a high prevalence of psychological distress and interruptions in access to healthcare services 2 years into the pandemic across five sub-Saharan African countries. Increased effort and attention should be given to addressing the negative impacts of COVID-19 on psychological distress. An equitable and collaborative approach to new and existing preventive measures for COVID-19 is crucial to limit the consequences of COVID-19 on the health of adults in sub-Saharan Africa.Item COVID-19 vaccine hesitancy and its determinants among Sub-Saharan African adolescents(PLOS, 2022) Wang, Dongqing; Chukwu, Angela; Mwanyika-Sando, Mary; Abubakar, Sulemana Watara; Assef, Nega; Madzorera, Isabel; Hemler, Elena C.; Ismai, Abbas; Lankoande, Bruno; Mapendo, Frank; Millogo, Ourohire´; Workneh, Firehiwot; Azemraw, Temesgen; Febir, Lawrence Gyabaa; James, Christabel; Tinkasimile, Amani; Asant, Kwaku Poku; Baernighausen, Till; Berhane, Yemane; Killewo, Japhet; Oduola, Ayoade M. J.; Sie, Ali; Smith, Emily R.; Soura, Abdramane Bassiahi; Raj, Tajudeen; Vuai, Said; Fawzi, Wafaie W.COVID-19 vaccine hesitancy among adolescents poses a challenge to the global effort to control the pandemic. This multi-country survey aimed to assess the prevalence and determinants of COVID-19 vaccine hesitancy among adolescents in sub-Saharan Africa between July and December 2021. The survey was conducted using computer-assisted telephone interviewing among adolescents in five sub-Saharan African countries, Burkina Faso, Ethiopia, Ghana, Nigeria, and Tanzania. A rural area and an urban area were included in each country (except Ghana, which only had a rural area), with approximately 300 adolescents in each area and 2662 in total. Sociodemographic characteristics and perceptions and attitudes on COVID-19 vaccines were measured. Vaccine hesitancy was defined as definitely not getting vaccinated or being undecided on whether to get vaccinated if a COVID-19 vaccine were available. Log-binomial models were used to calculate the adjusted prevalence ratios (aPRs) and 95% confidence intervals (CIs) for associations between potential determinants and COVID-19 vaccine hesitancy. The percentage of COVID-19 vaccine hesitancy was 14% in rural Kersa, 23% in rural Ibadan, 31% in rural Nouna, 32% in urban Ouagadougou, 37% in urban Addis Ababa, 48% in rural Kintampo, 65% in urban Lagos, 76% in urban Dar es Salaam, and 88% in rural Dodoma. Perceived low necessity, concerns about vaccine safety, and concerns about vaccine effectiveness were the leading reasons for hesitancy. Healthcare workers, parents or family members, and schoolteachers had the greatest impacts on vaccine willingness. Perceived lack of safety (aPR: 3.52; 95% CI: 3.00, 4.13) and lack of effectiveness (aPR: 3.46; 95% CI: 2.97, 4.03) were associated with greater vaccine hesitancy. The prevalence of COVID-19 vaccine hesitancy among adolescents is alarmingly high across the five sub-Saharan African countries, especially in Tanzania. COVID-19 vaccination campaigns among sub-Saharan African adolescents should address their concerns and misconceptions about vaccine safety and effectiveness.Item Determinants of COVID-19 vaccine readiness and hesitancy among adults in sub-Saharan Africa(PLOS Global Public Healt, 2023) Abubakari, Sulemana Watara; Workneh, Firehiwot; Asante, Kwaku Poku; Hemler, Elena C.; Madzorera, Isabel; Wang, Dongqing; Ismai, Abbas; Nega Assefa; Azemraw, Temesgen; Lankoande, Bruno; Nuhu, Abdul Razak; Chukwu, Angela; Mapendo, Frank; Millogo, Ourohiré; Olufemi, Adedokun A.; Okpara, Daniel; Boudo, Valentin; Mwanyika-Sando, Mary; Berhane, Yemane; Baernighause, Till; Oduola, Ayoade; Vuai, Said; Sie, Ali; Soura, Abdramane; Killewo, Japhet; Tajudeen, Raji; Fawz, Wafaie W.; Smith, Emily R.There is very limited data on the extent and determinants of COVID-19 vaccine hesitancy among adults living in sub-Saharan Africa since the global roll-out of vaccines began in 2021. This multi-country survey sought to investigate COVID-19 vaccine hesitancy and other predictors of readiness to get vaccinated. We conducted surveys among adults residing in nine urban and rural areas in Burkina Faso, Ethiopia, Ghana, Nigeria, and Tanzania in late 2021. Log binomial regression models were used to identify prevalence and factors associated with vaccine hesitancy and beliefs around COVID-19 misinformation. We completed a total of 2,833 interviews. Among all respondents, 9% had never heard of a COVID-19 vaccine, 12% had been vaccinated, and 20% knew someone else who had been vaccinated. The prevalence of vaccine hesitancy varied by country (Ethiopia 29%, Burkina Faso 33%, Nigeria 34%, Ghana 42%, Tanzania 65%), but not by rural or urban context. People who did not think the vaccine was safe or effective, or who were unsure about it, were more likely to be vaccine hesitant. Those who reported they did not have a trusted source of information about the vaccine (aPR: 1.25, 95% CI: 1.18,1.31) and those who thought the vaccine would not be made available to them within the year were more likely to be vaccine hesitant. Women were more likely to be vaccine hesitant (aPR: 1.31, 95% CI: 1.19,1.43) and believe COVID-19 falsehoods (aPR: 1.05, 95% CI: 1.02,1.08). The most commonly believed falsehoods were that the vaccine was developed too fast and that there was not enough information about whether the vaccine was effective or not. Educational campaigns targeted at misinformation and tailored to suit each country are recommended to build trust in COVID-19 vaccines and reduce hesitancy.Item Meals, Education, and Gardens for In-School Adolescents (MEGA): study protocol for a cluster randomised trial of an integrated adolescent nutrition intervention in Dodoma, Tanzania(BMJ Publishing Group, 2022) Wang, Dongqing; Katalambula, Leonard Kamanga; Modest, Andrea R; Young, Tara; Ismail, Abbas; Mwanyika-Sando, Mary; Tinkasimile, Amani; Mosha, Dominic; Malero, Augustine; Vuai, Said; Fawzi, Wafaie WIntroduction Secondary schools have the transformative potential to advance adolescent nutrition and provide a unique entry point for nutrition interventions to reach adolescents and their families and communities. Integrated school nutrition interventions offer promising pathways towards improving adolescent nutrition status, food security and building sustainable skill sets. Methods and analysis The Meals, Education, and Gardens for In-School Adolescents (MEGA) project aims to implement and evaluate an integrated, school-based nutrition intervention package among secondary schools in the Chamwino District of Dodoma, Tanzania. MEGA is a cluster-randomised controlled trial, including six public secondary schools assigned to three different arms. Two schools will receive the full intervention package, including school meals, school gardens, nutrition education and community workshops. Two schools will receive the partial intervention package, including the school garden, nutrition education and community workshops. Two schools will serve as the controls and will not receive any intervention. The intervention will be implemented for one academic year. Baseline and end-line quantitative data collection will include 750 adolescents and 750 parents. The domains of outcomes for adolescents will include haemoglobin concentrations, anthropometry, educational outcomes and knowledge, attitudes and practices regarding nutrition, agriculture and health. The domains of outcomes for parents will include knowledge, attitudes and practices of nutrition, agriculture and health. End-line focus group discussions will be conducted among selected adolescents, parents and teachers to assess the facilitators and barriers associated with the intervention. Ethics and dissemination. This study was approved by the Institutional Review Board at Harvard T.H. Chan School of Public Health (approval number: IRB20-1623), the Institutional Research Review Committee at the University of Dodoma (approval number: MA.84/261/02) and the Tanzania National Institute for Medical Research (approval number: NIMR/HO/R.8a/Vol. IX/3801). A manuscript with the research findings will be developed for publication.Item Optical and photovoltaic properties of substituted alizarin dyes for dye-sensitized solar cells application(Taylor & Francis, 2020) Abubakari, Ismail; Babu, Numbury Surendra; Vuai, Said; Makangara, JohnThis paper presents the theoretical study on photovoltaic and absorption properties of alizarin derivatives. Optimization of structures and calculations were performed by density functional theory and time-dependent density functional theory using B3LYP hybrid functional and 6–31 G (d,p) basis set. The dyes were formed by substituting 2-hexylthiophene mixed with carboxylic acid and 4-(benzo[c][1,2,5]thiadiazol-4-yl)benzoic acid. The performed substitution shows improvement in most of the properties. The highest occupied molecular orbital and lowest unoccupied molecular orbital energy levels of molecular dyes showed positive effect upon electron injection to semiconductor and subsequent regeneration by the electrolyte. Almost all necessary and important parameters to demonstrate the usefulness of molecular dyes as photo-sensitizers are detailed discussed. Based on the discussion and analysis, all considered molecules are proved to be useful in dye-sensitized solar cells using TiO2 semiconductor and I−/I−3 couple electrolyte. Collectively, dyes DY3 and DY2 showed better results than others with LHE and V oc of 0.2142 and 0.6722 eV, respectively, for DY3 and 0.7033 and 0.6224 eV, respectively, for DY2.Item School-based nutrition programs for adolescents in Dodoma, Tanzania: a situation analysis(SAGE, 2021) Rector, Collete; Afifa, Nadhira Nuraini; Gupta, Varun; Ismail, Abbas; Mosha, Dominic; Katalambula, Leonard K.; Vuai, Said; Young, Tara; Hemler, Elena C.; Wang, Dongqing; Fawzi, Wafaie W.Tanzania has a double burden of malnutrition, including a high prevalence of undernutrition and an increasing prevalence of overweight and obesity among adolescents. Schools present a valuable opportunity to reach a large section of the country’s adolescent population with nutrition-oriented interventions. The objective of this study was to assess the current state of adolescent school nutrition interventions in Dodoma, Tanzania, with emphasis on 3 potential school-based nutrition interventions, school vegetable gardens, school meals, and education (on nutrition, agriculture, and water, sanitation, and hygiene). Focus group discussions were conducted with several regional and district-level governmental stakeholders, including health, education, and agricultural officers. Ten public secondary schools were visited, and interviews with school administrators, teachers, students, and parents were conducted. All stakeholders interviewed supported interventions to improve school-based nutrition, including school gardens, school feeding, and nutrition education. All 10 schools visited had some experience providing school meals, but parents’ contributions were essential for the program’s sustainability. Most schools visited had land available for a school garden program, but water availability could be challenging during certain times of the year. The teachers interviewed expressed that the curriculum on nutrition education was highly theoretical and did not allow students to practice the knowledge and skills they learned in the classroom. The current school-based approach to tackling the double burden of adolescent malnutrition in Dodoma is localized and ad hoc. To leverage the potential of schools as a platform for nutrition interventions, integrated and policy-mandated interventions are needed.Item Socio-economic and spatial correlates of subclinical iodine deficiency among pregnant women age 15–49 years in Tanzania(BMC, 2017) Mtumwa, Abdalla H.; Ntwenya, Julius Edward; Paul, Edwin; Huang, Megan; Vuai, SaidBackground: Iodine deficiency is a widespread global health problem that affects about 2 billion people each year. Pregnant women are particularly vulnerable to iodine deficiency due to increased iodine requirement leading to death, miscarriage, and stillbirth. Iodine deficiency also has significant negative effects on newborns including impaired cognitive development, impaired learning capabilities, and stunting. This study looks at the association between subclinical iodine deficiency and demographic factors including age, wealth index, education, family size, geographical zone, number of children, fish consumption, pregnancy trimester and household salt in pregnant women aged 15–49 years in Tanzania. Methods: The 2010 Tanzania Demographic and Health Survey (TDHS) data was re analyzed. Subclinical iodine deficiency is classified as a urinary iodine concentration (UIC) of <150 μg/L. Results: Results showed that the prevalence of iodine deficiency (54%) was unacceptably high among pregnant women. The results of multiple logistic regression model found that number of children, wealth index, household salt, and geographical zone were significantly associated with iodine deficiency in these women. Conclusion: These results indicate a need to implement interventions to increase iodine intake that targets pregnant women with the specific demographic characteristics.Item Synthesis and photocurrent density–photovoltage (J–V) characterization of a novel alizarin derivative dye for dye-sensitized solar cell technology(Springer, 2022) Abubakari, Ismail; Babu, Numbury Surendra; Vuai, Said; Makangara, JohnDye-sensitized solar cells technology has attracted extensive academic scholars’ interests due to their potential low-cost solar energy harvesting. Increasing performance of dye-sensitized solar cell needs more efficient dye to maximize solar energy absorption. This work presents the synthesis and J–V characterization studies for a novel alizarin derivative dye HDD. The dye was formed by the reaction between brominated alizarin and 5-hexyl-2-thiopheneboronic acid pinacol ester. The final dye product was successfully synthesized as brownish-orange solid. Characterization of the synthesized dye was done using spectroscopic techniques; mass spectrometry, infrared spectroscopy and nuclear magnetic resonance before photovoltaic performance investigation. The dye was found to be useful as photo-sensitizer in dye-sensitized solar cell through calculation of conversion efficiency. Generally, the dye HDD showed better results in terms of photovoltaic properties with open-circuit voltage, short-circuit current density and fill factor of 0.65 V, 0.0146 A/cm2 and 0.612, respectively. The conversion efficiency of the cell using the synthesized dye HDD was found to be 5.81% under 100 mW/cm2 solar illuminations.Item The COVID-19 pandemic and its prolonged impacts on food prices, food consumption and diet quality in sub-Saharan Africa(Cold Spring Harbor Laboratory, 2022) Ismail, Abbas; Madzorera, Isabel; Apraku, Edward A.; Tinkasimile, Amani; Dasmane, Dielbeogo; Zabre, Pascal; Ourohire, Millogo; Assefa, Nega; Chukwu, Angela; Workneh, Firehiwot; Mapendo, Frank; Lankoande, Bruno; Hemler, Elena; Wang, Dongqing; Abubakari, Sulemana W.; Asante, Kwaku P.; Baernighausen, Till; Killewo, Japhet; Oduola, Ayoade; Sie, Ali; Soura, Abdramane; Vuai, Said; Smith, Emily; Berhane, Yemane; Fawzi, Wafaie W.Background Sub-Saharan Africa faces prolonged COVID-19 related impacts on economic activity, livelihoods, nutrition, and food security, with recovery slowed down by lagging vaccination progress. Objective This study investigated the economic impacts of COVID-19 on food prices, consumption and dietary quality in Burkina Faso, Ethiopia, Ghana, Nigeria, and Tanzania. Methods We conducted a repeated cross-sectional study and used a mobile platform to collect data. Data collected from round 1 (July-November, 2020) and round 2 (July-December, 2021) were considered. We assessed participants’ dietary intake of 20 food groups over the previous seven days. The study’s primary outcome was the Prime Diet Quality Score (PDQS), with higher scores indicating better dietary quality. We used linear regression and generalized estimating equations to assess factors associated with diet quality during COVID-19. Results Most of the respondents were male and the mean age (±SD) was 42.4 (±12.5) years. Mean PDQS (±SD) was low at 19.1 (±3.8) before COVID-19, 18.6(±3.4) in Round 1, and 19.4(±3.8) in Round 2. A majority of respondents (80%) reported higher than expected prices for all food groups during the pandemic. Secondary education or higher (estimate: 0.73, 95% CI: 0.32, 1.15), older age (estimate: 30-39 years: 0.77, 95% CI: 0.35, 1.19, or 40 years or older: 0.72, 95% CI: 0.30, 1.13), and medium wealth status (estimate: 0.48, 95% CI: 0.14, 0.81) were associated with higher PDQS. Farmers and casual laborers (estimate: -0.60, 95% CI: -1.11, - 0.09), lower crop production (estimate: -0.87, 95% CI: -1.28, -0.46) and not engaged in farming (estimate: -1.38, 95% CI: -1.74, -1.02) associated with lower PDQS. Conclusion Diet quality which had declined early in the pandemic had started to improve. However, consumption of healthy diets remained low, and food prices remained high. Efforts should continue to improve diet quality for sustained nutrition recovery through mitigation measures, including social protection.