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Circumcision and urinary tract infections.

To the Editor.—
 Wiswell, Smith, and Bass (Pediatrics 1985;75:901-903) reported an association between circumcision and decreased urinary tract infections in infancy. There being no plausible physiologic explanation for such a finding, before we accept any cause and effect relationship and the possible consequence (reversal of the worldwide trend away from routine circumcision of the newborn), we should seek alternative explanations. Several suggest themselves: (1) the two populations, having self-selected themselves (to have or not havecircumcision) differed in some way, socioculturally, in their prenatal habits or in their child-rearing behavior and these differences, not the circumcision, resulted in the discrepancy in incidence of urinary tract infection;