title: Risk factors for the presence of Campylobacter spp. in Dutch broiler flocks.
abstract: The campylobacter status of 495 broiler flocks sampled in The Netherlands between April 1997 and December 2000 was related to farm- and flock-specific information obtained from questionnaires to identify potential risk factors for campylobacter presence. Approximately 30% of the flocks tested positive for Campylobacter spp. in at least one pooled faecal sample. Multivariable logistic regression showed significant risk increments for: ages 29-35 days (OR = 2.34) and 36-42 days (OR = 3.96) compared to 22-28 days; > or =5 broiler houses on the premises (OR = 3.02); the presence of other farm animals on the farm (OR = 1.88); the presence of animals on farms within 1 km (OR = 9.56); and summer (OR = 3.48) and fall (OR = 2.59) compared to winter. Furthermore, hatcheries differed (ORs from 5.42 to 20.2), although this variable showed strong collinearity with the variables explaining feed mill and integrated poultry operations. We also identified interaction in which an increased risk from children entering the broiler house (OR = 28.0) was diminished by the use of broiler-specific workclothes. Population attributable fractions (PAFs) suggested that animals on farms within 1 km (PAF = 0.76) and hatchery (PAF = 0.67) had the highest impacts on campylobacter presence in Dutch broiler flocks. These factors, however, lack an easy interpretation of the mechanism behind the suggested effect.
authors.affiliation: Microbiological Laboratory for Health Protection, National Institute for Public Health and the Environment, PO Box 1, 3720 BA, Bilthoven, The Netherlands. martijn.bouwknegt@rivm.nl
authors.forename: M
authors.initials: M
authors.lastname: Bouwknegt
authors.forename: A W
authors.initials: AW
authors.lastname: van de Giessen
authors.forename: W D C
authors.initials: WD
authors.lastname: Dam-Deisz
authors.forename: A H
authors.initials: AH
authors.lastname: Havelaar
authors.forename: N J D
authors.initials: NJ
authors.lastname: Nagelkerke
authors.forename: A M
authors.initials: AM
authors.lastname: Henken
mesh_terms: D000367:Age Factors; D000704:Analysis of Variance; D000822:Animal Husbandry / Q000379:methods*; D000818:Animals; D002167:Campylobacter / Q000302:isolation & purification*; D002169:Campylobacter Infections / Q000453:epidemiology / Q000209:etiology / Q000662:veterinary*; D002645:Chickens; D003430:Cross-Sectional Studies; D005243:Feces / Q000382:microbiology; D005260:Female; D016015:Logistic Models; D008297:Male; D015999:Multivariate Analysis; D009426:Netherlands / Q000453:epidemiology; D011156:Population Density; D011201:Poultry Diseases / Q000453:epidemiology* / Q000209:etiology; D011481:Protective Clothing; D012307:Risk Factors; D012621:Seasons; D011795:Surveys and Questionnaires