Phylogenetic analysis of avian schistosome <i>Trichobilharzia regenti</i> (Schistosomatidae, Digenea) from naturally infected hosts in northern Iran

Lashaki, Elham Kia; Bozorgomid, Arezoo; Gholami, Shirzad; Karamian, Mehdi; Fakhar, Mahdi; Dodangeh, Samira

doi:10.1002/vms3.1225

Cited by 1 publication

(1 citation statement)

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“…The analyses conducted so far have been based on three gene regions, including 28S, the internal transcribed spacer (ITS) and the mitochondrial cox1. The investigations have confirmed that the nuclear ITS regions proved effective in delineating among Trichobilharzia species that are responsible for outbreaks of cercarial dermatitis ( Davis, Blair & Brant, 2021 ; Japa et al, 2021 ; Lashaki et al, 2023 ; Ashrafi et al, 2021 ).…”

Section: Introductionmentioning

confidence: 64%

Molecular identification of Trichobilharzia species in recreational waters in North-Eastern Poland

Korycińska,

Bulantová,

Horák

et al. 2024

PeerJ

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Background In Europe, avian schistosomes of the genus Trichobilharzia are the most common etiological agents involved in human cercarial dermatitis (swimmer’s itch). Manifested by a skin rash, the condition is caused by an allergic reaction to cercariae of nonhuman schistosomes. Humans are an accidental host in this parasite’s life cycle, while water snails are the intermediate, and waterfowl are the final hosts. The study aimed to conduct a molecular and phylogenetic analysis of Trichobilharzia species occurring in recreational waters in North-Eastern Poland. Methodology The study area covered three water bodies (Lake Skanda, Lake Ukiel, and Lake Tyrsko) over the summer of 2021. In total, 747 pulmonate freshwater snails (Radix spp., Lymnaea stagnalis) were collected. Each snail was subjected to 1–2 h of light stimulation to induce cercarial expulsion. The phylogenetic analyses of furcocercariae were based on the partial sequence of the ITS region (ITS1, 5.8S rDNA, ITS2 and 28SrDNA). For Radix spp. phylogenetic analyses were based on the ITS-2 region. Results The prevalence of the Trichobilharzia species infection in snails was 0.5%. Two out of 478 (0.4%) L. stagnaliswere found to be infected with Trichobilharzia szidati. Moreover, two out of 269 (0.7%) snails of the genus Radix were positive for schistosome cercariae. Both snails were identified as Radix auricularia. One of them was infected with Trichobilharzia franki and the other with Trichobilharzia sp. Conclusions Molecular identification of avian schistosome species, both at the intermediate and definitive hosts level, constitutes an important source of information on a potential threat and prognosis of local swimmer’s itch occurrence, and helps to determine species diversity in a particular area.

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