Abstract
Free-living amoebae (FLA) including Acanthamoeba spp., Naegleria fowleri, and Balamuthia mandrillaris are among the many waterborne parasites. There is not much known about the possible FLA contamination of the irrigation resources watering crops and agricultural lands in this country. Forty-five water samples were collected from water canals used for irrigation of farmlands and tested for the presence of pathogenic FLA using morphological and molecular-based methodology. The ITS region of Naegleria species was sequenced and a phylogenetic tree was generated to confirm the genetic associations and taxonomic status of the identified Naegleria spp. A total of seven (15.5%) samples were positive for FLA. Molecular analyses identified two strains as N. philippinensis (isolates: PW1 and PW2) isolated from irrigation treated water. One strain showed high homology with N. americana (isolate: PW3). To the best of our knowledge, the present study is the first study to isolate the two strains of N. philippinensis and N. americana from agricultural waters in Iran. The presence of the FLA in irrigation waters should be considered a potential health threat for exposed farmers and other people.
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