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  • Title: Impact of rainfall on the hygienic quality of blue mussels and water in urban areas in the Inner Oslofjord, Norway.
    Author: Tryland I, Myrmel M, Østensvik Ø, Wennberg AC, Robertson LJ.
    Journal: Mar Pollut Bull; 2014 Aug 15; 85(1):42-9. PubMed ID: 24998797.
    Abstract:
    The effects of precipitation on the hygienic quality of water and blue mussels collected from five different localities in the urban areas in the Inner Oslofjord were investigated, with samples analysed for Escherichia coli, Salmonella spp., pathogenic Vibrio spp., Norovirus, Sapovirus, Cryptosporidium spp. and Giardia duodenalis. The sampling sites were located at varying distances from the outlet of combined sewer overflows (CSO)-impacted rivers/streams. In general, 1-3 log₁₀ increases in fecal indicator bacteria and human pathogens were observed after heavy rainfalls. Blue mussels appeared to be a useful indicator of the impact of sewage at these sites, and generally a good correlation was identified between concentrations of E. coli and other human pathogens in the mussels. Provision of general advice to the public of avoiding areas near the outlets of CSO-impacted rivers after heavy rainfall may reduce the risk of gastroenteritis by bathers and others that may swallow water during recreational activities.
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