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The zebra mussel (Dreissena polymorpha) is an abundant and invasive molluscan shellfish species which arrived in Ireland’s river basins in the early 1990’s. Inland and coastal surface waters can be contaminated by human waterborne zoonotic enteropathogens such as Cryptosporidium parvum, Giardia lamblia, Encephalitozoon intestinalis, E. hellem and Enterocytozoon bieneusi originating predominantly from wastewater treatment plant effluents and agricultural runoff. Bivalve species, i.e., the invasive zebra mussel, Mytilus edulis (blue mussel) and Anodonta anatina (duck mussel) were used as sentinels and also as biomonitors of the aforementioned waterborne pathogens at twelve sites located in three Irish river basin districts impacted by pollution related to various water quality pressures. A variety of advanced biomolecular techniques were utilized to assess the presence and concentration of these pathogens in molluscan shellfish. At least one pathogen species was detected in bivalves at each of the twelve sites. Cryptosporidium, implicated in several recent Irish gastrointestinal epidemics, was recorded at all sites subjected to agricultural runoff and at one treated wastewater discharge site, linking source-track directly to animal and human fecal wastes. Overall, the results demonstrated a long-term human enteropathogen contamination of Irish waters with consequent public health risk-factors for drinking water abstraction and water-based recreational activities. The study provided further solid evidence that zebra mussels can recover and concentrate environmentally derived human pathogens and therefore can be used for the sanitary assessment of surface water quality.

Assessment of waterborne parasites in Irish river basin districts – use of zebra mussels (Dreissena polymorpha) as bioindicators