[The seasonality of pyoderma in workers of the Don Basin coal mines]

Seasonal patterns of pyoderma have been studied in 2899 miners, as well as the relationship between these patterns and the patients' age, occupation, and the major weather factors. The incidence of pyoderma regularly increases in summer and autumn, whatever the geological conditions in the mines. One peak (summer-autumn) has been determined for the dermatologic forms and 2 (winter and summer-autumn) for the surgical ones. The seasonal fluctuations in pyoderma incidence are more manifest in subjects aged over 50. No close correlation between pyoderma incidence and the major weather factors has been detected. Seasonal cyclic pattern of pyoderma is related to the adaptation of man to the environmental conditions.