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In the years 2009 – 2013 in the Trencin region, 730 samples of dust from the conveyor belts and droppings of laying hens had been taken to determine the prevalence of Salmonella in individual rearings. H w s pe ph ff uc k M N ma me pr ma ug ue ud xpe o f uc qua f jurfic bfit f bfie ua L k w mpr ul...