--- title: "Death of Salmonella, Escherichia coli O157:H7, and Listeria monocytogenes in shelf-stable, dairy-based, pourable salad dressings" date: 2006-04-12T09:34:37-07:00 author: Bill Marler canonical_url: "https://marlerclark.com/news_events/death-of-salmonella-escherichia-coli-o157h7-and-listeria-monocytogenes-in-shelfstable-dairybased-pourable-salad-dressings" section: News --- [All News](/news_events) / [Outbreaks](https://marlerclark.com/news_events/outbreaks) / # Death of Salmonella, Escherichia coli O157:H7, and Listeria monocytogenes in shelf-stable, dairy-based, pourable salad dressings ![](http://www.ecoliblog.com/B00006KK8I.01.MZZZZZZZ.jpg) An abstract in the April 2006 Journal of Food Protection discussed the death rates of [Salmonella](http://www.about-salmonella.com/), [E. coli O157:H7](http://www.about-ecoli.com/), and [Listeria](http://www.about-listeria.com/) in three commercially manufactured full-fat ranch salad dressings, three reduced-fat ranch salad dressings, two full-fat blue cheese salad dressings, and two reduced-fat blue cheese salad dressings. The study attempted to affirm the expectation that these dressings do not support the growth of these pathogens. Dressings were inoculated with low and high populations of separate five-strain mixtures of each pathogen, and stored at 25 degrees Celcius for up to 15 days. Regardless of the initial inoculation population, all test pathogens rapidly died in all salad dressings, ranging from 1 to 8 days maximum. The type of dressing and level of fat in the dressings did not have a marked effect on the rate of inactivation of pathogens. Based on these observations, shelf-stable, dairy-based, pourable ranch and blue cheese salad dressings manufactured by three companies and stored at 25 degrees C do not support the growth of Salmonella, E. coli O157:H7, and Listeria, and should not be considered as potentially hazardous foods as defined by the U.S. Food and Drug Administration Food Code. ### Other E. coli Lawsuits [Raw Farms linked to another Raw Milk Cheese E.coli Outbreak - 9 People sickened - Company refuses to recall product](https://marlerclark.com/raw-farms-linked-to-another-raw-milk-cheese-e-coli-outbreak-7-people-sickened) [10 with E. coli linked to Cheese](https://marlerclark.com/3-with-e-coli-linked-to-cheese) [Sycamore Pool in Chico California Contaminated with E.coli - Two teens in ICU](https://marlerclark.com/sycamore-pool-in-chico-california-contaminated-with-e-coli-two-teens-in-icu) [Deadly Nationwide E.coli Outbreak Linked to Grimmway Farms Organic Baby and Whole Carrots sickens 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