The Kato-Katz technique for stool examination, now widely employed in Brazil, has been shown to be useful in the diagnosis of giardiasis. However, the efficacy of a concentration method, using zinc sulphate, was higher. The sensitivity of both the Kato-Katz technique and the gravity sedimentation method were compared andyielded similar results. As far as stool examination by the Kato-Katz technique are concerned, the best results were obtained after immediate analysis or 24 hours later.
Diagnosis of giardiasis; Stool examination; Kato-Katz technique