[Immunoglobulin A glomerulonephritis. Epidemiology in a population of 250 000 inhabitants].

Between April 1, 1975 and May 1, 1982, 192 cases of primary glomerulonephritis were histologically diagnosed in the Nephrology centre of a health district with 250 000 inhabitants; 58 (30.2%) of the lesions were IgA glomerulonephritis. All patients were born and lived in that district. At the end of the period under review the prevalence of IgA glomerulonephritis was evaluated at 1/10 000 and its incidence at 2.5/100 000 per year. The disease began in subjects under 35 years of age in 65% of the cases, with a peak between 16 and 25 years. Thirty-seven patients were symptom-free, and the condition was diagnosed either at recruitment in the army (15 cases; 25.2%) or during the annual medical examination of industrial workers (19 cases; 39.7%). At the end of the study, 21 patients (36%) had renal failure, and 5 of these (8.5%) were under periodical haemodialysis. This study shows how valuable it would be from a socio-economic point of view if the role played by public health institutions in detecting the disease were confirmed and if its prevalence among the French population were precisely known.