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Ophthalmic Epidemiol. 2015;22(3):214-25. doi: 10.3109/09286586.2015.1037401.

The Global Trachoma Mapping Project: Methodology of a 34-Country Population-Based Study.

Author information

1
Faculty of Infectious and Tropical Diseases, London School of Hygiene & Tropical Medicine , London , UK .

Abstract

PURPOSE:

To complete the baseline trachoma map worldwide by conducting population-based surveys in an estimated 1238 suspected endemic districts of 34 countries.

METHODS:

A series of national and sub-national projects owned, managed and staffed by ministries of health, conduct house-to-house cluster random sample surveys in evaluation units, which generally correspond to "health district" size: populations of 100,000-250,000 people. In each evaluation unit, we invite all residents aged 1 year and older from h households in each of c clusters to be examined for clinical signs of trachoma, where h is the number of households that can be seen by 1 team in 1 day, and the product h × c is calculated to facilitate recruitment of 1019 children aged 1-9 years. In addition to individual-level demographic and clinical data, household-level water, sanitation and hygiene data are entered into the purpose-built LINKS application on Android smartphones, transmitted to the Cloud, and cleaned, analyzed and ministry-of-health-approved via a secure web-based portal. The main outcome measures are the evaluation unit-level prevalence of follicular trachoma in children aged 1-9 years, prevalence of trachomatous trichiasis in adults aged 15 + years, percentage of households using safe methods for disposal of human feces, and percentage of households with proximate access to water for personal hygiene purposes.

RESULTS:

In the first year of fieldwork, 347 field teams commenced work in 21 projects in 7 countries.

CONCLUSION:

With an approach that is innovative in design and scale, we aim to complete baseline mapping of trachoma throughout the world in 2015.

KEYWORDS:

Blindness; mHealth; prevalence study; trachoma; trichiasis

PMID:
26158580
PMCID:
PMC4687001
DOI:
10.3109/09286586.2015.1037401
[Indexed for MEDLINE]
Free PMC Article

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