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Since July 1987 to June 1988, out of a total of 2,009 stool examinations performed at a private laboratory, in Barquisimeto, Venezuela, we could identify Blastocystis hominis in 206 of them, using the methods of wet preparation with S.S.F., Iugol and Quensel. Clinical information was obtained in 73 patients. The group more affected was the one older than 12 years of age. We suggest the investigation and to report B. hominis in the feces test, because in presence of clinic manifestations and absence of other enteropathogenic can be the responsible.

Sera collected from 606 children of low socioeconomic level attending the University and Children's hospitals in Maracaibo, Venezuela, were screened for serologic evidence of Entamoeba histolytica infection, employing the indirect hemagglutination test. The seropositivity rate was 7.7%. Most of the positive sera showed low titers (1:128-1:256). The overall prevalence of positive reactors increased with age. Stool examinations done on 516 children revealed cysts or trophozoites of E. histolytica in 4.4%.