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To the Editor.—
The incidence of acute cystitis in women rises strikingly once regular intercourse begins, and there can be little doubt that intercourse and infection go together. As urologists, we have recognized a pattern to this problem and hopefully have devised a simple and effective prevention.In most cases, the symptoms of acute cystitis do not appear for 36 hours after intercourse. It is important that the patient be told of this relationship. The idea that infection takes place in one evening and that the symptoms appear the next morning seems to be fallacious. When the rapid onset of symptoms does occur, we assume that an abnormality is present in the urethra.It is our impression that a woman usually voids on going to bed, probably emptying her bladder, and then has intercourse within the next hour. With intercourse, massage of the urethra beneath the pubic symphysis takes place,
Lyon RP, Marshall S. Postcoital Water Flush In the Prevention of Urinary Tract Infection. JAMA. 1971;218(12):1828. doi:10.1001/jama.1971.03190250054019
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