FN Archimer Export Format PT J TI Improving the efficacy of sewage treatment decreases norovirus contamination in oysters BT AF SCHAEFFER, Julien TREGUIER, Cathy PIQUET, Jean-Come GACHELIN, Sonia COCHENNEC-LAUREAU, Nathalie LE SAUX, Jean-Claude GARRY, Pascal LE GUYADER, Soizick AS 1:1;2:2;3:1;4:3;5:2;6:1;7:1;8:1; FF 1:PDG-RBE-SGMM-LSEM;2:PDG-RBE-DOI;3:PDG-RBE-SGMM-LSEM;4:;5:PDG-ODE-LITTORAL-LERMPL;6:PDG-RBE-SG2M-LSEM;7:PDG-RBE-SGMM-LSEM;8:PDG-RBE-SGMM-LSEM; C1 Ifremer, Lab Microbiol, LSEM SG2M, Nantes, France. Ifremer, Lab Environm Ressources MPL, La Trinite Sur Mer, France. Com Reg Conchylicole Bretagne Sud, Auray, France. C2 IFREMER, FRANCE IFREMER, FRANCE CRC, FRANCE SI NANTES LA REUNION LORIENT BREST SE PDG-RBE-SGMM-LSEM PDG-RBE-DOI PDG-ODE-LITTORAL-LERMPL PDG-RBE-SG2M-LSEM IN WOS Ifremer jusqu'en 2018 copubli-france IF 4.006 TC 17 UR https://archimer.ifremer.fr/doc/00450/56140/57707.pdf LA English DT Article DE ;Norovirus;Shellfish safety;Sewage treatment;Coastal water quality AB As human population increases worldwide, water quality will become increasingly problematic, and food consumed raw may be of higher risk. This is already evident for oysters grown in coastal areas - despite regulations based on bacterial indicators, oysters are still implicated in food-borne outbreaks worldwide. The pathogens most frequently detected are human noroviruses, which are shed at high concentrations in human excreta and are very resistant to environmental conditions. Sewage treatment plants usually apply a variety of steps such as activated sludge treatment, chlorine or UV disinfection to eliminate contaminants, these processes have variable efficacy. This study demonstrates the impact of replacing an old lagoon-based sewage treatment plant with a new membrane bioreactor sewage treatment plant on human norovirus levels in treated sewage and oysters. While comparable norovirus concentrations were detected in the influent samples, a clear difference was observed in effluent quality, as norovirus was only detected in one sample after treatment in the new membrane bioreactor system, confirming the efficiency of such technology. As a direct impact, oysters located close to the membrane bioreactor sewage outfall were less frequently contaminated by norovirus, and showed lower concentrations compared to the first period of the study when they were exposed to sewage effluent from the lagoon outfall. Shellfish located upstream showed comparable contamination levels suggesting that there are also other sources of norovirus contamination in the estuary. Considering the health benefits of shellfish consumption, improving wastewater quality will make an important contribution to enhancing the safety of shellfish and international food PY 2018 PD DEC SO International Journal Of Food Microbiology SN 0168-1605 PU Elsevier Science Bv VL 286 UT 000449140800001 BP 1 EP 5 DI 10.1016/j.ijfoodmicro.2018.07.016 ID 56140 ER EF