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Listeria sp. counts in concrete, open-trench floor drain 3, which was located in the middle of a high-traffic area and was typically filled to 20 to 40% of capacity during operation. ▪, bottom side of cover; ▨, right side of drain; ▤, left side of drain; ▩, inside of drain; □, floor within ca. 30 cm of the drain. (T), CE treatment applied.
