Rosiléia Marinho de Quadros1, Luiz Claudio Miletti2, Geisel Willian Ezequiel3, Sandra Márcia Tietz Marques

The aim of the present study was to check the occurrence of Giardia duodenalis among children from Santa Catarina state, Brazil. Ninety-one stool samples collected from children enrolled in eight local elementary schools (Group I) and from 529 children whose stools were analyzed by a local privately-owned laboratory (Group II) were screened. Group I had 12.09% of G. duodenalis cysts in the fltation method and 7.69% in the sedimentation method, while Group II had 5.29% and 4.73% in the same methods, respectively. The positive results of the 620 samples for G. duodenalis in both diagnostic methods corresponded to 6.29%. The sensitivity of the fltation method, compared to the sedimentation one, was 81%, whereas specifiity was 99% with a positive predictive value of 91% and a negative predictive value of 99%, with a Kappa of 0.98 and accuracy of 98%. There was no difference in parasitic infection rates relative to age and seasons of the year for any of the groups, but a signifi cant difference was observed on the chi-squared test (p ≤ 0.05), on which boys from Group II were more likely to be infected.

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