Global feasibility assessment of interrupting the transmission of soil-transmitted helminths: a statistical modelling study.


Brooker, SJ; Nikolay, B; Balabanova, D; Pullan, RL; (2015) Global feasibility assessment of interrupting the transmission of soil-transmitted helminths: a statistical modelling study. The Lancet infectious diseases, 15 (8). pp. 941-50. ISSN 1473-3099 DOI: 10.1016/S1473-3099(15)70042-3

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Abstract

BACKGROUND: Emphasis is being given to the control of neglected tropical diseases, including the possibility of interrupting the transmission of soil-transmitted helminths (STH). We evaluated the feasibility by country of achieving interruption of the transmission of STH.<br/> METHODS: Based on a conceptual framework for the identification of the characteristics of a successful STH control programme, we assembled spatial data for a range of epidemiological, institutional, economic, and political factors. Using four different statistical methods, we developed a composite score of the feasibility of interrupting STH transmission and undertook a sensitivity analysis of the data and methods.<br/> FINDINGS: The most important determining factors in the analysis were underlying intensity of STH transmission, current implementation of control programmes for neglected tropical diseases, and whether countries receive large-scale external funding and have strong health systems. The composite scores suggested that interrupting STH transmission is most feasible in countries in the Americas and parts of Asia (eg, Argentina [range of composite feasibility scores, depending on scoring method, 9·4-10·0], Brazil [8·7- 9·7], Chile [8·84-10·0], and Thailand [9·1-10·0]; there was perfect agreement between the four methods), and least feasible in countries in sub-Saharan Africa (eg, Congo [0·4-2·7] and Guinea [2·0-5·6]; there was full agreement between methods), but there were important exceptions to these trends (eg, Ghana [7·4-10·0]; there was agreement between three methods). Agreement was highest between the scores derived with the expert opinion and principal component analysis weighting schemes (Pearson correlation coefficient, r=0·98). The largest disagreement was between benefit-of-the-doubt-derived and principal-component-analysis-derived weighting schemes (r=0·74).<br/> INTERPRETATION: The interruption of STH transmission is feasible, especially in countries with low intensity of transmission, supportive household environments, strong health systems, and the availability of suitable delivery platforms and in-country funds, but to achieve local elimination of STH an intersectoral approach to STH control will be needed.<br/> FUNDING: Bill & Melinda Gates Foundation and Wellcome Trust.<br/>

Item Type: Article
Faculty and Department: Faculty of Public Health and Policy > Dept of Global Health and Development
Faculty of Infectious and Tropical Diseases > Dept of Disease Control
Research Centre: ECOHOST - The Centre for Health and Social Change
Neglected Tropical Diseases Network
Centre for the Mathematical Modelling of Infectious Diseases
PubMed ID: 25886799
Web of Science ID: 358182500033
URI: http://researchonline.lshtm.ac.uk/id/eprint/2160233

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