Columbian researchers studying 275 children attending under 5 attending day care centers in Calarca, Columbia report that children infected with Blastocystis had a significantly higher prevalence of diarrhea (OR=1.95, 95% CI, p < 0.05), with 45% of Blastocystis-positive children reporting diarrhea vs. 33% of Blastocystis-negative children. Etiological study suggested that Blastocystis infection may come from contamination of a sugar cane beverage, floors, or foods other than bottled milk. The full free text is available from Biomedica.