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The trichomonad species Pentatrichomonas hominis colonises the gastrointestinal tract and is generally considered as a commensal organism in humans. However, some studies have recognised an association between diarrhoea and P hominis infection in dogs and cats.1 2 In the present report, we have identified this species using molecular tools in two patients with gastrointestinal troubles. Our data suggest that P hominis is a possible zoonotic species with a significant potential of transmission by water and could be the causative agent of intestinal symptoms in children.
An adult (case 1) was followed up for different pathologies including irritable bowel syndrome (IBS). Diarrhoeic stools of the patient were examined and were negative for intestinal parasites. Filter paper/slant culture technique for the recovery of Strongyloides stercoralis larval-stage nematodes from fresh faeces was performed. After 5 days, microscopic examination of the stool culture using merthiolate-iodine-formalin and RAL555 stains did not detect larval nematodes but numerous flagellates, provisionally identified as trichomonads (figure 1A,B). Although no treatment against trichomonads was administered to the patient, the stool examinations performed afterwards did not reveal trichomonads or other parasites.
A young child (case 2) presented with abdominal pain and loose stools without fever. A stool sample was examined by direct light …