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Contamination of Vector Snails With the Larval Stages of Trematodes in Selected Areas in Northern Iran



Aryaeipour M1, 2 ; Mansoorian AB2 ; Rad MBM2 ; Rouhani S3 ; Pirestani M4 ; Hanafibojd AA5 ; Daryani A6 ; Asadi T7 ; Rokni MB2, 8 ; Sarvi S6
Authors
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Authors Affiliations
  1. 1. Student of Research Committee, Mazandaran University of Medical Sciences, Sari, Iran
  2. 2. Department of Medical Parasitology and Mycology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
  3. 3. Department of Medical Parasitology and Mycology, Shahid Beheshti University of Medical Sciences, Tehran, Iran
  4. 4. Department of Parasitology and Entomology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran
  5. 5. Department of Medical Entomology and Vector Control, School of Public Health and National Institute of Health Research, Tehran University of Medical Sciences, Tehran, Iran
  6. 6. Toxoplasmosis Research Center, Communicable Diseases Institute, Mazandaran University of Medical Sciences, Sari, Iran
  7. 7. School of Biology, College of Science, University of Tehran, Tehran, Iran
  8. 8. Research Center for Endemic Parasites of Iran, Tehran University of Medical Sciences, Tehran, Iran

Source: Iranian Journal of Public Health Published:2022

Abstract

Background: Identification of freshwater snails and possible trematodes transmission sites are essential to continue monitoring the potential for disease outbreaks in areas with a history of parasitic infections. We aimed to search some areas in the margin of the Caspian Sea, northern Iran to identify the snail fauna of this area and verify the contamination of vector snails. Methods: More than 5,308 snails from 51 diverse and permanent habitats were studied from April 2019 to October 2021. Snails were collected randomly and identified using shell morphology. Trematode infection in snails was investigated by the release of cercariae and dissection methods. Results: Five families of freshwater snails including Lymnaeidae, Physidae, Planorbidae, Bithyniidae, and Viviparidae were investigated in the Caspian Sae Litoral of Iran. Physidae were found as the most prevalent snails (55.1%) followed by Lymnaeidae (29.4%). The parasitize rate was observed as 20% using releasing cercaria tech-nique. Echinostomatoidea (31%), Schistosomatoidea (8%), and Diplostomoidea (21%), and Plagiorchioidea (40%) were seen as detected parasites. Meanwhile, 60% of the studied snails illustrated the other stages of trem-atodes. Conclusion: The rate of infection of snails with different cercaria in northern Iran is significant. It needs further deep studies to clarify the situation of zoonoses transmitted by snails in the region. Policy makers should pay attention more to this area in terms of monitoring the snail-transmitted diseases. © 2022 Aryaiepour et al. Published by Tehran University of Medical Sciences.