The prevalence and distribution of trachoma in the Sudan has been studied. The morbidity rate of 83.2 per 1000 in the Northern Province decreases southwards until it reaches 0.94 in the extreme south (Equatoria Province). 2. In endemic areas infection starts very early--in the first year of life. 3. There is a marked difference between the prevalence of trachoma in towns and villages--71.3 per cent for the age group 1-4 years in villages, and 56.7 per cent for the same age group in the towns. This is probably due to better standards of living and hygiene in the towns. 4. Some relationship has been found between the rainfall, the relative humidity, and the incidence of trachoma, but this does not necessarily apply in other countries. 5. The factors that may explain the high prevalence of trachoma in the northern Sudan are: a. Mechanical trauma caused by frequent sandstorms. b. Irritation of the eyes by dust particles, leading to excessive watering and discharge, and rubbing with the fingers. c. The habit of frequent hand-shaking. d. Poor personal hygiene in pre-schoolchildren. e. Associated bacterial conjunctivitis. f. The presence of eye-seeking flies.
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