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—To determine the effect of regular intake of cranberry juice beverage on bacteriuria and pyuria in elderly women.

—Randomized, double-blind, placebo-controlled trial.

—Volunteer sample of 153 elderly women (mean age, 78.5 years).

—Subjects were randomly assigned to consume 300 mL per day of a commercially available standard cranberry beverage or a specially prepared synthetic placebo drink that was indistinguishable in taste, appearance, and vitamin C content but lacked cranberry content.

—A baseline urine sample and six clean-voided study urine samples were collected at approximately 1-month intervals and tested quantitatively for bacteriuria and the presence of white blood cells.

—Subjects randomized to the cranberry beverage had odds of bacteriuria (defined as organisms numbering ≥10⁵/mL) with pyuria that were only 42% of …