title: Risk factors for campylobacteriosis in two washington state counties with high numbers of dairy farms.
abstract: Campylobacteriosis is a frequently reported, food-borne, human bacterial disease that can be associated with ruminant reservoirs, although public health messages primarily focus on poultry. In Washington State, the two counties with the highest concentrations of dairy cattle also report the highest incidences of campylobacteriosis. Conditional logistic regression analysis of case-control data from both counties found living or working on a dairy farm (odds ratio [OR], 6.7 [95% confidence interval [CI], 1.7 to 26.4]) and Hispanic ethnicity (OR, 6.4 [95% CI, 3.1 to 13.1]) to have the strongest significant positive associations with campylobacteriosis. When the analysis was restricted to residents of one county, Hispanic ethnicity (OR, 9.3 [95% CI, 3.9 to 22.2]), contact with cattle (OR, 5.0 [95% CI, 1.3 to 19.5]), and pet ownership (OR, 2.6 [95% CI, 1.1 to 6.3]) were found to be independent risk factors for disease. Campylobacter jejuni isolates from human (n = 65), bovine (n = 28), and retail poultry (n = 27) sources from the same counties were compared using multilocus sequence typing. These results indicated that sequence types commonly found in human isolates were also commonly found in bovine isolates. These findings suggest that, in areas with high concentrations of dairy cattle, exposure to dairy cattle may be more important than food-borne exposure to poultry products as a risk for campylobacteriosis.
authors.affiliation: Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, Washington, USA.
authors.forename: Margaret A
authors.initials: MA
authors.lastname: Davis
authors.forename: Danna L
authors.initials: DL
authors.lastname: Moore
authors.forename: Katherine N K
authors.initials: KN
authors.lastname: Baker
authors.forename: Nigel P
authors.initials: NP
authors.lastname: French
authors.forename: Marianne
authors.initials: M
authors.lastname: Patnode
authors.forename: Joni
authors.initials: J
authors.lastname: Hensley
authors.forename: Kathryn
authors.initials: K
authors.lastname: Macdonald
authors.forename: Thomas E
authors.initials: TE
authors.lastname: Besser
mesh_terms: D000822:Animal Husbandry; D000818:Animals; D002169:Campylobacter Infections / Q000453:epidemiology* / Q000382:microbiology / Q000662:veterinary*; D016123:Campylobacter jejuni / Q000145:classification / Q000235:genetics / Q000302:isolation & purification; D016022:Case-Control Studies; D002417:Cattle; D002418:Cattle Diseases / Q000382:microbiology; D016000:Cluster Analysis; D005006:Ethnicity; D005517:Foodborne Diseases / Q000453:epidemiology*; D006801:Humans; D017720:Molecular Epidemiology; D058885:Multilocus Sequence Typing; D016273:Occupational Exposure; D011200:Poultry; D011201:Poultry Diseases / Q000382:microbiology; D012307:Risk Factors; D014861:Washington / Q000453:epidemiology
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