[Prevention of pyelonephritis].

The possibilities of the prophylaxis of pyelonephritis in the intrauterine life, in infancy and childhood, in internal medicine, gynaecology and urology are described. After explanation of the causes of pyelonephritis it is referred to the importance of the asymptomatic, significant bacteriuria and it is emphasized that there is no primary pyelonephritis, but every pyelonephritis is secondary.