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April Study detects presence of disease-causing E.coli in recreational waters, including in bathing waters rated excellent und
Study detects presence of disease-causing E.coli in recreational waters, including in bathing waters rated excellent und
New research due to be presented at this year’s European Congress on Clinical Microbiology and Infectious Diseases (ECCMID)* has revealed the presence of disease-causing E.coli in recreational waters, including from beaches rated excellent under EU criteria. The study is led by Professor Dearbháile Morris and Dr Louise O’Connor at the School of Medicine, NUI Galway.
E.coli are part of the normal gut flora of humans and animals, but not all E. coli are exactly the same. Some E. coli can produce toxins that can cause serious infection in humans. Shiga -toxigenic E. coli (STEC) are pathogenic E. coli that can cause severe intestinal infection and potentially renal failure and death. Ireland has had the highest incidence rate for human infection with STEC among EU member states for many years, reporting 10 times the EU average in 2017. This research looked at recreational waters for the presence of STEC.
Seawater, river and lake samples were collected around Ireland between December 2018 and October 2019 and examined for genetic markers of STEC.
Of the 75 samples tested, 49 (65%) were positive for the presence of STEC genetic markers, including 29/52 (56%) seawater samples, 14/15 (93%) river samples and 6/8 (75%) lake samples.
Professor Morris says: “To our knowledge this is the first investigation of recreational waters across Ireland for the presence of STEC. There was a high occurrence of genetic markers for STEC in the samples tested, highlighting the need for further investigation to establish the scale of the problem, not only in Ireland but globally. It is worth noting that all of the bathing waters tested were designated as of good or excellent quality based on current EU bathing water quality monitoring criteria. Bathing water quality is assessed based on estimating the total number of E. coli in a 100ml sample over a defined time-period (May to September). Bathing waters in Europe and elsewhere are not routinely monitored for the presence of STEC. This study highlights the limitations of only assessing the total number of E. coli present as an indicator of water quality without taking into consideration the potential pathogenicity of some variants.”