Rates of infection increase in conditions of crowding and poor sanitation, and are higher in military personnel and mental institutions. The true extent of disease has yet to emerge, as most laboratories do not use techniques to adequately identify this organism. An Australian study identified a large number of patients, considered to have irritable bowel syndrome, who were actually infected with Dientamoeba fragilis. Although D. fragilis has been described as an infection "emerging from obscurity", it has become one of the most prevalent gastrointestinal infections in industrialized countries, especially among children and young adults. A Canadian study reported a prevalence of around 10% in boys and girls aged 11–15 years, a prevalence of 11.5% in individuals aged 16–20, and a lower incidence of 0.3–1.9% in individuals over age 20.
Dientamoebiasis
Thelaziasis
Paragonimiasis
Isosporiasis
Metagonimiasis
Loa loa filariasis
Cyclosporiasis
Toxocariasis