Entamoeba histolytica and Entamoeba dispar infection in children in Bangladesh.

The prevalence of infection by the invasive parasite Entamoeba histolytica and the noninvasive parasite Entamoeba dispar was determined in 2000 children in Bangladesh. Antigen detection identified more cases of E. histolytica-E. dispar infection than did culture or microscopy. Microscopic identification of E. histolytica-E. dispar complex infection in stool did not equate with the diagnosis of amebic dysentery because most amebic infections in this population were due to E. dispar: Urban children with diarrhea had a 4.2% prevalence of E. histolytica infection and a 6.5% prevalence of E. dispar infection; rural asymptomatic children had a 1.0% prevalence of E. histolytica infection and a 7.0% prevalence of E. dispar infection. Shigella dysenteriae and Shigella flexneri infections were more frequent in children who also had Entamoeba infection, a potentially important consideration for the empiric treatment of dysentery in this population.