title: Hospital-acquired listeriosis linked to a persistently contaminated milkshake machine.
abstract: One case of hospital-acquired listeriosis was linked to milkshakes produced in a commercial-grade shake freezer machine. This machine was found to be contaminated with a strain of Listeria monocytogenes epidemiologically and molecularly linked to a contaminated pasteurized, dairy-based ice cream product at the same hospital a year earlier, despite repeated cleaning and sanitizing. Healthcare facilities should be aware of the potential for prolonged Listeria contamination of food service equipment. In addition, healthcare providers should consider counselling persons who have an increased risk for Listeria infections regarding foods that have caused Listeria infections. The prevalence of persistent Listeria contamination of commercial-grade milkshake machines in healthcare facilities and the risk associated with serving dairy-based ice cream products to hospitalized patients at increased risk for invasive L. monocytogenes infections should be further evaluated.
authors.affiliation: Food Protection Program of Environmental Health Division,Public Health - Seattle & King County,Seattle,WA,USA.
authors.forename: E
authors.initials: E
authors.lastname: Mazengia
authors.affiliation: Communicable Disease Epidemiology and Immunization Section,Public Health - Seattle & King County,Seattle,WA,USA.
authors.forename: V
authors.initials: V
authors.lastname: Kawakami
authors.affiliation: Communicable Disease Epidemiology and Immunization Section,Public Health - Seattle & King County,Seattle,WA,USA.
authors.forename: K
authors.initials: K
authors.lastname: Rietberg
authors.affiliation: Communicable Disease Epidemiology and Immunization Section,Public Health - Seattle & King County,Seattle,WA,USA.
authors.forename: M
authors.initials: M
authors.lastname: Kay
authors.affiliation: Food Protection Program of Environmental Health Division,Public Health - Seattle & King County,Seattle,WA,USA.
authors.forename: P
authors.initials: P
authors.lastname: Wyman
authors.affiliation: Food Protection Program of Environmental Health Division,Public Health - Seattle & King County,Seattle,WA,USA.
authors.forename: C
authors.initials: C
authors.lastname: Skilton
authors.affiliation: University of Washington,Seattle,WA,USA.
authors.forename: A
authors.initials: A
authors.lastname: Aberra
authors.affiliation: University of Washington,Seattle,WA,USA.
authors.forename: J
authors.initials: J
authors.lastname: Boonyaratanakornkit
authors.affiliation: University of Washington,Seattle,WA,USA.
authors.forename: A P
authors.initials: AP
authors.lastname: Limaye
authors.affiliation: University of Washington,Seattle,WA,USA.
authors.forename: S A
authors.initials: SA
authors.lastname: Pergam
authors.affiliation: University of Washington,Seattle,WA,USA.
authors.forename: E
authors.initials: E
authors.lastname: Whimbey
authors.affiliation: University of Washington,Seattle,WA,USA.
authors.forename: R J
authors.initials: RJ
authors.lastname: Olsen-Scribner
authors.affiliation: Communicable Disease Epidemiology and Immunization Section,Public Health - Seattle & King County,Seattle,WA,USA.
authors.forename: J S
authors.initials: JS
authors.lastname: Duchin
mesh_terms: D003428:Cross Infection / Q000453:epidemiology* / Q000382:microbiology; D004783:Environmental Microbiology; D005260:Female; D005511:Food Handling; D005517:Foodborne Diseases / Q000453:epidemiology* / Q000382:microbiology; D005838:Genotype; D006761:Hospitals; D006801:Humans; D008089:Listeria monocytogenes / Q000145:classification / Q000235:genetics / Q000302:isolation & purification*; D008088:Listeriosis / Q000453:epidemiology* / Q000382:microbiology; D008297:Male; D008875:Middle Aged; D058889:Molecular Typing
keywords:  Listeria ; Hospital-acquired (nosocomial) infections; listeriosis; milkshake machine