The anorectal region is exposed to regular bowel movements containing 1012 microorganisms per gram. It is therefore surprising that infections in this area are only rarely observed. It appears that the mechanical barrier of the mucosa is essential to prevent infections as they readily occur in the case of rupture or poor drainage. The anorectal region is not only exposed to fecal flora, but also to sexually transmitted diseases, which have now become less frequent because of the changing sexual practices linked to the prevention of human immunodeficiency virus (HIV) infections.
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