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CONSIDERABLE EVIDENCE exists that asymptomatic infections of the urinary tract are much more frequent than was realized only a few years ago (1-13). Among pregnant women in particular, prevalence rates have ranged as high as 12 percent (14)-Such in¬ fections are a hazard to mother and fetus in that particular pregnancy and may predispose to hypertension, chronic renal disease, and other medical problems of later life (3,4, 6-8,10-12). It is obvious that if an abnormality is common and potentially serious, it should be sought routinely. Such detection demands simple, reliable, and inexpensive techniques. Several

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