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Dientamoeba fragilis, atypical protozoon because “flagellate without flagella” but amoeba-like, of whom we know only the trophozoitic stage (an so its brittleness outside intestinal tract), is a frequent responsible of intestinal human infections, worldwide, and some authors relate that D. fragilis is the most frequent protozoon and parasite that can infects humans. Actually we don’t know a sure potential “reservoir” in animals who are strictly in contact with humans, and it is difficult to understand its epidemiological chain, otherwise the transmissions to humans and from humans to humans. For all these reasons we performed another study on subjects of swine breedings, and among people who work in these breedings, that are in direct contact or not with pigs. Using standardized methodologies, we analyzed 224 faecal specimens of swine and 15 human specimens.We use for identification of D. fragilis the Giemsa stain.These were the results: D. fragilis was observed in 50.9% of pigs and 20% among humans (30% in workers strictly in contact with breedings and pigs, 0% in familiars or other without a closed contact with swines). Other commensal protozoa were observed with variable associations, but in this article we want to analyze the possible transmission from this pigs to humans (and for us this protozoon is undoubtedly a “reservoir” of D. fragilis for humans), and underline two aspects: for the research of this protozoon, standard procedures area mandatory, with a permanent stain, as Giemsa stain, is necessary, and in all humans with various intestinal infections or troubles, particularly “irritable bowel syndrome” (or similar ones), the specimens must be analyzed for D. fragilis. At least we think that in the near future molecular studies are important for confirming this our observations, and for verifying eventual and probable differences inside genotypes of this very suggestive protozoon, that until now present not rarely phenotypic diversities

Could be the swine responsible of transmission to the humans of Dientamoeba fragilis infection?