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Urinary infection, urinary stasis, dietary abnormality, metabolic disorder and environmental factors has been suggested as the etiologic factors of urinary stones and has been discussed by many authors. Among these, urinary infection seems to be one of major etiologic factors in the formation of urinary stones. To learn more basic relationship between urinary infection and stone, the authors attempted clinical analysis of 422 patient with urinary stones, admitted to Severance Hospital, Seoul, Korea from January, 1970 to December, 1973 and the following results were obtained. 1. Pyuria was present in 41.3% of total stone patients 2. Positive urine culture was 8.3% in total patients of urinary stone, 2.5% in 248 cases of the patients without pyuria and 20.1% in 174 cases of the patients with pyuria. 3. Identified organisms from the patient with urinary stone were Pseudomonae (10 cases), E. coli, Aerobacter, and Staphylococci in orders. 4. Recurrent stone was 103 cases (24.4%) and single attack stone was 3I9 cases (75,6%) in total patients. The ratio of pyuria and positive urine culture were higher in the recurrent stone group than in single attack stones. E. coli was predominant organism .in single attack stone grouP. while Pseudomoaes in recurrent stone patients. 5. Staghorn stones and multiple stones were present in 19 and 26 cases respectively, and urine culture was positive in 36.8% and 26.9% in each group of these two groups, Pseudomonas was most predominant infecting organism is recurrent and staghorn stone patients.
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