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Multilevel Analysis of Trachomatous Trichiasis and Corneal Opacity in Nigeria: The Role of Environmental and Climatic Risk Factors on the Distribution of Disease

Fig 1

Prevalence of trichiasis (TT) or corneal opacity (CO) in adults over 40 years in Nigeria, 2005–2007.

Higher prevalence clusters are predominantly in northern areas of Nigeria.

doi: https://doi.org/10.1371/journal.pntd.0003826.g001