Molecular detection and characterization of Cryptosporidium spp. in the sewage-contaminated rivers entering Bandar-e Anzali Lagoon in Guilan Province, Iran

Document Type: Original Article

Author

1 Cellular and Molecular Research Center, Faculty of Medicine, Guilan University of Medical Sciences, Rasht, Iran

2 Department of Parasitology, Faculty of Medicine, Guilan University of Medical Sciences, Rasht, Iran

3 Medical Biotechnology Research Center, Guilan University of Medical Sciences, Rasht, Iran

10.22102/jaehr.2020.203874.1145

Abstract

Waterborne cryptosporidiosis in river water is considered to be an important source of Cryptosporidium oocysts in most developing countries across the world. In the present study, 20 water samples were collected from Zarjoob and Goharrood rivers contaminated with wastewater in the province of Guilan, Iran. The samples were filtrated through a membrane filter (pore size: 1.2 μm), then the sucrose clarification and molecular genotyping methods were also carried out. In total, 12 out of 20 water samples were positive for Cryptosporidium species based on the 18S RNA-based polymerase chain reaction (PCR) and sequencing techniques. In addition, C. parvum, C. muris, C. homnis, and C. canis were detected in the water samples studied. According to the results, river water resources were polluted with the pathogenic species of Cryptosporidium with human and animal sources, which increased the potential risk of waterborne cryptosporidiosis. Moreover, the long-term use of sewage-contaminated river water to irrigate crops and agriculture farms could be a major threat to local residents.

Keywords


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