At the 4th Global Scientific Meeting on trachoma it was agreed that to assess whether the elimination prevalence target for trachomatous trichiasis (TT) has been reached, national programmes may use: (i) population-based prevalence surveys powered at evaluation-unit level; (ii) house-to-house case searches; or (iii) a combination of data from multiple adjacent evaluation units.
This multi-country mixed methods in Ethiopia, Kenya, Nigeria and Tanzania sets out to understand discrepancies between TT prevalence survey findings and programme or interview findings. The explanatory factors for these ‘mismatch’ situations may be on the patient side, the provider/programme side or a combination of them both.
In this study the research team will re-examine TT cases identified during recent Tropical Data prevalence surveys and subsequently consult the case finder and outreach registers to determine if the responses are a match or mismatch with the survey data. In the case of mismatch semi-structured interviews with case finders, surgeons, medical supervisors and programme staff will follow.
The results from this study will inform the need for any evidence-based programmatic changes, in relation to a) how case finding and outreach activities are conducted to ensure full geographical coverage; b) how recording and reporting of geographical coverage is done.