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Minja EG, Mrimi EC, Mponzi WP, Mollel GJ, Lang C, Beckmann J, Gerber M, Pühse U, Long KZ, Masanja H, Okumu FO, Finda MF, Utzinger J. Prevalence and Determinants of Undernutrition in Schoolchildren in the Kilombero District, South-Eastern Tanzania. Trop Med Infect Dis 2024; 9:96. [PMID: 38787029 PMCID: PMC11125975 DOI: 10.3390/tropicalmed9050096] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2024] [Revised: 04/19/2024] [Accepted: 04/23/2024] [Indexed: 05/25/2024] Open
Abstract
Childhood undernutrition is a major issue in low- and middle-income countries, affecting the health, well-being, and educational outcomes of schoolchildren. This study aimed to assess the prevalence and associated factors of stunting, wasting, and underweight among schoolchildren in peri-urban areas in the south-eastern part of Tanzania. A cross-sectional study was conducted involving 930 children aged 6-12 years from four primary schools from July to August 2019. The WHO Anthro Survey Analyzer was employed to estimate the prevalence of stunting, wasting, and underweight, while logistic regression analyses examined sociodemographic background, malaria infection, anaemia, anthropometric measures, and dietary diversity score as potential factors. The prevalence of stunting, wasting, underweight, overweight, and obesity was 11.8%, 4.3%, 3.9%, 11.1%, and 2.0%, respectively. Overall, 1.5% of the children had malaria, as determined by rapid diagnostic tests, and 0.4% had severe anaemia. Univariate analysis indicated higher odds of undernutrition among children aged 9-12 compared to their younger peers. Stunting was more common among children with low and medium dietary diversity. Anaemia was found in 11.2% of schoolchildren, and severe anaemia was associated with wasting. Multivariate analysis revealed that age and low dietary diversity were significantly associated with undernutrition. These findings emphasise the need for school-based health and nutrition programmes targeting children beyond the age of 5 to improve their nutritional status and mitigate potential adverse effects on health, cognition, and academic achievement. Regular assessment of the nutritional status of schoolchildren is warranted.
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Affiliation(s)
- Elihaika G. Minja
- Environmental Health and Ecological Sciences, Ifakara Health Institute, Ifakara P.O. Box 53, Tanzania; (E.C.M.); (W.P.M.); (G.J.M.); (H.M.); (F.O.O.); (M.F.F.)
- Swiss Tropical and Public Health Institute, Kreuzstrasse 2, CH-4123 Allschwil, Switzerland; (K.Z.L.); (J.U.)
- Faculty of Medicine, University of Basel, Petersplatz 1, CH-4003 Basel, Switzerland
| | - Emmanuel C. Mrimi
- Environmental Health and Ecological Sciences, Ifakara Health Institute, Ifakara P.O. Box 53, Tanzania; (E.C.M.); (W.P.M.); (G.J.M.); (H.M.); (F.O.O.); (M.F.F.)
- Swiss Tropical and Public Health Institute, Kreuzstrasse 2, CH-4123 Allschwil, Switzerland; (K.Z.L.); (J.U.)
- Faculty of Medicine, University of Basel, Petersplatz 1, CH-4003 Basel, Switzerland
| | - Winfrida P. Mponzi
- Environmental Health and Ecological Sciences, Ifakara Health Institute, Ifakara P.O. Box 53, Tanzania; (E.C.M.); (W.P.M.); (G.J.M.); (H.M.); (F.O.O.); (M.F.F.)
| | - Getrud J. Mollel
- Environmental Health and Ecological Sciences, Ifakara Health Institute, Ifakara P.O. Box 53, Tanzania; (E.C.M.); (W.P.M.); (G.J.M.); (H.M.); (F.O.O.); (M.F.F.)
- Department of Pediatrics and Child Health, Muhimbili University of Health and Allied Sciences, Dar es Salaam P.O. Box 65001, Tanzania
| | - Christin Lang
- Department of Sport, Exercise and Health, University of Basel, Grosse Allee 6, CH-4052 Basel, Switzerland; (C.L.); (J.B.); (M.G.); (U.P.)
| | - Johanna Beckmann
- Department of Sport, Exercise and Health, University of Basel, Grosse Allee 6, CH-4052 Basel, Switzerland; (C.L.); (J.B.); (M.G.); (U.P.)
| | - Markus Gerber
- Department of Sport, Exercise and Health, University of Basel, Grosse Allee 6, CH-4052 Basel, Switzerland; (C.L.); (J.B.); (M.G.); (U.P.)
| | - Uwe Pühse
- Department of Sport, Exercise and Health, University of Basel, Grosse Allee 6, CH-4052 Basel, Switzerland; (C.L.); (J.B.); (M.G.); (U.P.)
| | - Kurt Z. Long
- Swiss Tropical and Public Health Institute, Kreuzstrasse 2, CH-4123 Allschwil, Switzerland; (K.Z.L.); (J.U.)
- Faculty of Medicine, University of Basel, Petersplatz 1, CH-4003 Basel, Switzerland
| | - Honorati Masanja
- Environmental Health and Ecological Sciences, Ifakara Health Institute, Ifakara P.O. Box 53, Tanzania; (E.C.M.); (W.P.M.); (G.J.M.); (H.M.); (F.O.O.); (M.F.F.)
| | - Fredros O. Okumu
- Environmental Health and Ecological Sciences, Ifakara Health Institute, Ifakara P.O. Box 53, Tanzania; (E.C.M.); (W.P.M.); (G.J.M.); (H.M.); (F.O.O.); (M.F.F.)
- School of Biodiversity, One Health and Veterinary Medicine, University of Glasgow, Glasgow G12 8QQ, UK
- School of Life Science and Bioengineering, Nelson Mandela African Institution of Science & Technology, Arusha P.O. Box 447, Tanzania
| | - Marceline F. Finda
- Environmental Health and Ecological Sciences, Ifakara Health Institute, Ifakara P.O. Box 53, Tanzania; (E.C.M.); (W.P.M.); (G.J.M.); (H.M.); (F.O.O.); (M.F.F.)
- School of Life Science and Bioengineering, Nelson Mandela African Institution of Science & Technology, Arusha P.O. Box 447, Tanzania
| | - Jürg Utzinger
- Swiss Tropical and Public Health Institute, Kreuzstrasse 2, CH-4123 Allschwil, Switzerland; (K.Z.L.); (J.U.)
- Faculty of Medicine, University of Basel, Petersplatz 1, CH-4003 Basel, Switzerland
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K. Milugo T, V. Mosha M, Wampande E, Philemon R, N. Lwanga I, Seeley J, K. Sewankambo N. Public engagement by early career researchers during the COVID-19 pandemic: case studies from East Africa. OPEN RESEARCH AFRICA 2023; 6:4. [PMID: 39021711 PMCID: PMC11252639 DOI: 10.12688/openresafrica.13897.2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 11/09/2023] [Indexed: 07/20/2024]
Abstract
Background Community engagement and involvement (CEI) in research usually depends on face-to-face interactions. However, the COVID-19 pandemic prevented such interactions because of national lockdowns and social distancing. This paper highlights the ways in which early career researchers from East Africa tackled CEI activities during the pandemic. Methods We provide four case examples that illustrate how early-career researchers based in Kenya, Uganda and Tanzania, deployed different approaches and initiatives to community-engaged research during the pandemic to encourage participation and uptake of research findings. Results All the three early-career researchers attempted to use virtual/digital means to implement the CEI. However, in each country, this attempt was unsuccessful because of poor connectivity, as well as many poorer students lacking access to telephones and computers. Nevertheless, the researchers effectively engaged the students using different activities (making up songs, drawing comics, and taking part in quizzes) once the schools reopened. Conclusion These results highlight the complexity of implementing community engagement and involvement in health research when face-to-face interaction is not possible. The findings are relevant to researchers who wish to incorporate community engagement in their research and initiatives.
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Affiliation(s)
- Trizah K. Milugo
- International Centre of Insect Physiology and Ecology, Nairobi, Kenya
- Technical University of Kenya, Nairobi, Kenya
| | - Mary V. Mosha
- Institute of Public Health, Kilimanjaro Christian Medical University College, Moshi, Tanzania
| | - Eddie Wampande
- Makerere University, College of Veterinary Medicine, Animal Resources and Bio Security, Kampala, Uganda
| | - Rune Philemon
- Institute of Public Health, Kilimanjaro Christian Medical University College, Moshi, Tanzania
| | | | - Janet Seeley
- London School of Hygiene and Tropical Medicine,, London, UK
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Hlahla MO, Kunene LA, Mphekgwana PM, Madiba S, Monyeki KD, Modjadji P. Comparison of Malnutrition Indicators and Associated Socio-Demographic Factors among Children in Rural and Urban Public Primary Schools in South Africa. CHILDREN (BASEL, SWITZERLAND) 2023; 10:1749. [PMID: 38002840 PMCID: PMC10670259 DOI: 10.3390/children10111749] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2023] [Revised: 10/19/2023] [Accepted: 10/26/2023] [Indexed: 11/26/2023]
Abstract
Most children in South Africa attending public schools are predisposed to malnutrition due to poor infrastructure and social inequality. This is despite the implementation of the National School Nutrition Programme to address barriers to learning associated with hunger and malnutrition and the National Development Plan to reduce child malnutrition through provision of social grants. In view of this, we compared malnutrition indicators and associated socio-demographic factors among children in rural Mpumalanga and urban Gauteng in South African public primary schools selected using a multistage cluster random sampling. A validated researcher-administered questionnaire was used to collect socio-demographic data of caregivers, along with primary school children data collected on age, sex, learning grade, and anthropometric measures. Malnutrition indicators, which are stunting (low height-for-age z-scores), underweight (low weight-for-age z-scores), thinness (low body-mass-index-for-age z-scores), and overweight/obesity (high body mass index) were computed using WHO Anthro Plus 1.0.4 and data were analyzed using Stata 18. A total of 903 children (rural = 390 and urban = 513) with a mean age of 10 ± 2 years in the foundation phase (learning grades one to three) and the intermediate learning phase (learning grades four to seven) participated with their caregivers (mean age: 39 ± 8 years). Significant levels of poor socio-demographic status were observed among caregivers living in the rural setting compared to in the urban setting. Overall, thinness (18%), stunting (12%), underweight (10%), and overweight/obesity (24%) were observed among school children. Children in the rural schools had a significantly higher prevalence of stunting (20% vs. 3%; p < 0.0001), underweight (17% vs. 2%; p < 0.0001) and thinness (28% vs. 7%; p < 0.001) than their urban counterparts. In the urban, the odds of stunting, underweight and thinness were less among school children, while overweight/obesity was twice as likely in the urban setting. The multivariate final model showed lower odds of underweight [adjusted odds ratio (AOR) = 0.16; 95% confidence interval (CI): 0.06-0.42] and stunting [AOR = 0.33; 95% CI: 0.13-0.87] in the urban compared to the rural schools. The association of stunting with sex [AOR =0.53; 95% CI: 0.30-0.94] and the intermediate learning phase [AOR = 7.87; 95% CI: 4.48-13.82] was observed in the rural setting, while thinness was associated with living in households with an income of USD 52.51 to USD 262.60/month [AOR = 2.89; 95% CI: 1.01-8.24] and receiving the child social grant [AOR = 2.49; 0.90-6.86] in the urban setting. Overweight/obesity was associated with living in a household with an income of USD 52.51 to USD 262.60/month [AOR = 1.80; 95% CI: 1.02-3.10]. The findings suggest nutritional intervention approaches that are accustomed to the context of settings to effectively tackle malnutrition.
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Affiliation(s)
- Mosebudi Olga Hlahla
- Department of Public Health, School of Health Care Sciences, Sefako Makgatho Health Sciences University, 1 Molotlegi Street, Ga-Rankuwa, Pretoria 0208, South Africa
| | - Lindy Agatha Kunene
- Department of Public Health, School of Health Care Sciences, Sefako Makgatho Health Sciences University, 1 Molotlegi Street, Ga-Rankuwa, Pretoria 0208, South Africa
| | - Peter Modupi Mphekgwana
- Research Administration and Development, University of Limpopo, Polokwane 0700, South Africa
| | - Sphiwe Madiba
- Faculty of Health Sciences, University of Limpopo, Polokwane 0700, South Africa
| | - Kotsedi Dan Monyeki
- Department of Physiology and Environmental Health, University of Limpopo, Polokwane 0700, South Africa
| | - Perpetua Modjadji
- Department of Public Health, School of Health Care Sciences, Sefako Makgatho Health Sciences University, 1 Molotlegi Street, Ga-Rankuwa, Pretoria 0208, South Africa
- Non-Communicable Disease Research Unit, South African Medical Research Council, Cape Town 7505, South Africa
- Department of Life and Consumer Sciences, College of Agriculture and Environmental Sciences, University of South Africa, Roodepoort, Johannesburg 1709, South Africa
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Said FA, Khamis AG, Salmin AH, Msellem SN, Mdachi K, Noor R, Leyna G, Mchau GJ. Influence of diet quality on nutritional status of school-aged children and adolescents in Zanzibar, Tanzania. PLoS One 2023; 18:e0293316. [PMID: 37862346 PMCID: PMC10588882 DOI: 10.1371/journal.pone.0293316] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2023] [Accepted: 10/09/2023] [Indexed: 10/22/2023] Open
Abstract
BACKGROUND Malnutrition among young children and adolescents poses a serious health challenge in developing countries which results in many health problems during adulthood. Poor diet quality is known as the root cause of malnutrition which is caused by unhealthy food choices and bad eating habits among young children and adolescents. However, limited evidence is available on diet quality and its association with nutrition status among young children and adolescents in Zanzibar. This study examined the diet quality and its relationship with the nutritional status of school-aged children and adolescents in Zanzibar. METHODS Data for this study was obtained from the cross-sectional survey of School Health and Nutrition (SHN) conducted in Zanzibar. The survey recruited children aged 5-19 years from 93 schools in Zanzibar. A seven-day food frequency questionnaire (FFQ) was used to assess dietary intake. Prime Dietary Quality Score (PDQS) consisted of 21 food groups was then constructed to assess the diet quality of school-aged children and adolescents. Body mass index (BMI-for-age Z-score) was used as the indicator of nutrition status. Both linear and logistic regression analysis techniques were used to determine the associations between BMI and PDQS. RESULTS A total data of 2,556 children were enrolled in the survey. The prevalence of thinness was 8.1%, normal 82.1%, overweight 7.2% and obesity 2.6%. The mean (SD) PDQS score was 18.8 (3.2) which ranged from 8 to 33. Consumptions of green leafy vegetables (49.3%), yellow or red fruits (37.8%), legumes (38.3%), fish (36.3%), and vegetable oil (31.5%) were up to three times per week, whereas consumptions of white vegetables (77.3%), cooked vegetables (32.6%), citrus fruits (66.8%), other types of fruits (66.2%), nuts (46.4%), poultry (49.6%), whole grains (61%) and eggs (67.8%) were less than once per week. In terms of unhealthy foods, eating fried foods was reported by 26.3% up to three times per week, and 31.5% reported consuming sweets and ice cream up to three times in the past week. High PDQS was significantly associated with a reduction in BMI of children (p< 0.005). For each unit increase in the consumption of unhealthy foods such as fried foods, cooked vegetables and refined grains there is a significant increase in BMI. The odds of being obese decrease significantly as diet quality increases from the first to third quintile of PDQS (AOR = 0.2, 0.04-0.89 95% CI, p = 0.035). CONCLUSION Consumption of high quality diet was found to be associated with a reduction in excessive weight among school-aged children and adolescents in Zanzibar. There is a need for interventions targeting to reduce unhealthy food consumption in school environment. Further research should be conducted to assess diet quality using PDQS among young children and adolescents.
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Affiliation(s)
- Fatma Ali Said
- Department of Preventive Services and Health Promotion, Ministry of Health Zanzibar, Zanzibar, Tanzania
| | | | - Asha Hassan Salmin
- Department of Preventive Services and Health Promotion, Ministry of Health Zanzibar, Zanzibar, Tanzania
| | | | - Kombo Mdachi
- Office of the Chief Government Statistician, Zanzibar, Tanzania
| | | | - Germana Leyna
- Tanzania Food and Nutrition Centre, Dar-es-salaam, Tanzania
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Mahmoodi Z, Gill P, Qorbani M, Mohammadian Khonsari N, Sheidaei A, Heshmat R, Heidari-Beni M, Kelishadi R. Socioeconomic inequality in different phenotypes of childhood obesity and its determinants in Iran: a Blinder-Oaxaca decomposition method. BMC Public Health 2022; 22:1580. [PMID: 35986309 PMCID: PMC9392315 DOI: 10.1186/s12889-022-13997-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2022] [Accepted: 08/11/2022] [Indexed: 11/25/2022] Open
Abstract
Background Childhood obesity has become a significant public health issue worldwide. Socioeconomic status is among its key determinants. This study examined the socioeconomic inequality in different phenotypes of childhood obesity at the national level in Iran. Methods This national, multistage school cross-sectional study was undertaken in 2015 on 14,400 students aged 7–18 years from urban and rural areas of 30 provinces of Iran. Using principal component analysis, socioeconomic status (SES) was categorized into tertiles. SES inequality in different phenotypes of obesity (i.e., generalized obesity", "abdominal obesity", and combined obesity) was estimated using the concentration index. The determinants of this inequality were assessed by the Blinder-Oaxaca decomposition method. Results Overall, 14,274 students completed the study (response rate: 99%). The mean age was 12.28 years, 50.6% were boys, and 71.42% lived in urban areas. The prevalence of generalized obesity and abdominal obesity was 20.8% and 11.3%, respectively. The concentration index for different phenotypes of obesity was positive, indicating that inequality is more common amongst the low SES groups. High SES, being male, living in a rural, and having a positive family history of obesity were associated with general obesity. Moderate physical activity and living in a rural area were associated with abdominal obesity. In addition, living in a rural area, having a high SES, being male, and having a positive family history of obesity were associated with combined obesity. Conclusion According to the present study findings, all childhood obesity phenotypes were more prevalent in Iranian children with high SES. Therefore, due to obesity and other diseases, it is essential to implement environmental changes in addition to designing macro-educational programs and prevention strategies.
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Le GB, Dinh DX. Prevalence and associated factors of overweight and obesity among primary school children: a cross-sectional study in Thanhhoa City, Vietnam. BMJ Open 2022; 12:e058504. [PMID: 35459674 PMCID: PMC9036463 DOI: 10.1136/bmjopen-2021-058504] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
OBJECTIVE To determine the prevalence and associated factors of overweight and obesity among primary school children (6-11 years old) in Thanhhoa city in 2021. DESIGN Cross-sectional study. SETTING Seven primary schools in Thanhhoa city, Vietnam. PARTICIPANTS 782 children (and their parents). PRIMARY AND SECONDARY OUTCOME MEASURES Two-stage cluster random sampling was used for selecting children and data were collected from January to February 2021. A self-administrated questionnaire was designed for children and their parents. Children's height and weight were measured and body mass index (BMI)-for-age z-scores were computed using the WHO Anthro software V.1.0.4. Data were analysed using R software V.4.1.2. The associations between potential factors and childhood overweight/obesity were analysed through univariate and multivariate logistic regression analyses. Variables were selected using the Bayesian Model Averaging method. RESULTS The prevalence of overweight/obesity among primary school children in Thanhhoa city was 35.93% (overweight 21.61% and obesity 14.32%). The proportion of overweight girls was nearly equal to that of boys (20.78% and 22.52%, respectively, p=0.6152) while the proportion of boys with obesity was four times as many as that of girls (23.86% and 5.62%, respectively, p<0.0001). Child's sex was the factor significantly associated with childhood overweight/obesity. Boys had double the risk of being overweight/obese than girls (adjusted OR: aOR=2.48, p<0.0001). Other potential factors which may be associated with childhood overweight/obesity included mode of transport to school, the people living with the child, mother's occupation, father's education, eating confectionery, the total time of doing sports, and sedentary activities. CONCLUSION One in every three primary school children in Thanhhoa city were either overweight or obese. Parents, teachers and policy-makers can implement interventions in the aforementioned factors to reduce the rate of childhood obesity. In forthcoming years, longitudinal studies should be conducted to determine the causal relationships between potential factors and childhood overweight/obesity.
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Affiliation(s)
- Giang Ba Le
- Faculty of Public Health, University of Medicine and Pharmacy at Ho Chi Minh City, Ho Chi Minh City, Viet Nam
| | - Dai Xuan Dinh
- Department of Pharmaceutical Management and Pharmacoeconomics, Hanoi University of Pharmacy, Hanoi, Viet Nam
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Mosha MV, Paulo HA, Msuya SE, Grosskurth H, Filteau S. Lack of an association between dietary patterns and adiposity among primary school children in Kilimanjaro Tanzania. BMC Nutr 2022; 8:35. [PMID: 35449025 PMCID: PMC9022355 DOI: 10.1186/s40795-022-00529-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2021] [Accepted: 04/13/2022] [Indexed: 11/20/2022] Open
Abstract
Introduction Healthy dietary habits prevent childhood overweight and obesity and the risk of non-communicable diseases (NCDs) later in life. We examined dietary patterns and their association with adiposity among primary school children in northern Tanzania. Methods Dietary data was collected by 24-h recall and food frequency questionnaire (FFQ) for 1170 primary school children aged 9 – 11 years from 20 primary schools in the Kilimanjaro region. Factor analysis and FFQ data were used to identify dietary patterns. Children were categorized into terciles of their adherence to each dietary pattern. Multilevel logistic regression was used to evaluate the association of dietary pattern terciles with adiposity indicators: body mass index z–scores (BMI z scores), body fat percentage by bioelectrical impedance, triceps, subscapular skinfold thicknesses, and waist circumference. Results Fifteen percent of children had BMI Z > 1.0, indicating overweight or obesity. Two dietary patterns were identified by factor analysis: a healthy pattern characterized by frequent consumption of fruits and vegetables; and a mixed dietary pattern characterized by intake of fatty snacks, sweets and sugar snacks, sugary beverages, meat and alternatives, milk, and milk products. After adjusting for potential confounders, for both models: model 1 (age and sex), and model 2 (age, sex, school type, time spent walking to school, district [urban/ rural], availability of television and electronic gadgets at home and neighbourhood playground); we found no significant associations between dietary patterns and adiposity measures. Conclusion Dietary patterns were not associated with adiposity in Tanzanian primary school children, possibly because of limitations of the FFQ, which did not record information on portion sizes. Future research should focus on understanding the key foods / snacks consumed by school children, portion sizes and their long-term effects on adiposity in children. Supplementary Information The online version contains supplementary material available at 10.1186/s40795-022-00529-4.
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Affiliation(s)
- Mary Vincent Mosha
- Institute of Public Health, Kilimanjaro Christian Medical University College (KCMUCO), Moshi, Tanzania.
| | - Heavenlight A Paulo
- Department of Epidemiology and Biostatistics, Muhimbili University of Health and Allied Sciences, Dar es Salaam, Tanzania
| | - Sia E Msuya
- Institute of Public Health, Kilimanjaro Christian Medical University College (KCMUCO), Moshi, Tanzania
| | - Heiner Grosskurth
- London School of Hygiene and Tropical Medicine (LSHTM), London, UK.,Mwanza Intervention Trials Unit (MITU), National Institute for Medical Research, Mwanza, Tanzania
| | - Suzanne Filteau
- London School of Hygiene and Tropical Medicine (LSHTM), London, UK
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