Abstract Background In 2002 we investigated an outbreak comprising 231 patients in Norway. caused by Pseudomonas aeruginosa and linked to the use of contaminated mouth swabs called Dent-O-Sept. Here we describe the extent of contamination of the swabs. and identify critical points in the production process that made the contamination possible. https://www.petalandpupers.shop/product-category/knitwear/