[Trachoma in the province of Ouarzazate, Morocco].

A survey on the prevalence and severity of trachoma was carried out in the province of Ouarzazate, Morocco. In conformity with the guidelines proposed by the WHO Programme for the Prevention of Blindness, a random sample of 30 clusters was extracted from the general population of the province, according to probability proportional to size. Thus, the sample comprised 1200 individuals, of whom 1185 were examined. Participation in the survey was 98.8% and, overall, the sample is considered representative of the province. The simplified grading system proposed by WHO was used to register the data on trachoma and its complications. The global prevalence of trachoma was estimated at 40.8% (95% confidence interval (95% CI) = 30.2-51.4%) and that of active trachoma (follicular (TF), intense (TI), and mixed (TF + TI)) at 18% (95% CI = 12.8-23.2%). The trachomatous intensity indicator (presence of TI) for children under 10 years of age was 12.8% (95% CI = 6.8-18.8%). The severity of the infection is confirmed by prevalences of trichiasis-entropion of 2.2% (95% CI = 1.4-3.0%) and central corneal opacity of 3.3%. Corneal blindness is estimated at 1.6%. The epidemiological pattern of trachoma merits particular attention in the field of public health, particularly in the valley of Oued Drâa, where all the indicators are consistently higher than those elsewhere in the province.