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Bacteriological and epidemiological studies of campylobacter spp. in Swedish broilers

Hansson, Ingrid (2007). Bacteriological and epidemiological studies of campylobacter spp. in Swedish broilers. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2007:63
ISBN 978-91-576-7362-6
[Doctoral thesis]

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Campylobacter jejuni is the most frequently reported cause of bacterial gastrointestinal illness in humans in Sweden. Chicken products are considered an important risk factor for human infection. This thesis analyses and identifies sources and risk factors for colonisation of Campylobacter spp. in broilers at both farm level and slaughter. Slaughter groups with a low within-group prevalence were identified, split slaughter was confirmed as a risk factor and contamination of carcasses was shown to occur both during transport and during the slaughter process. Environmental campylobacter load was comparable on high and low incidence farms, indicating that hygiene regime is of greater importance than environmental load. Slaughter groups with a high within-flock prevalence had significantly higher campylobacter load in carcasses at slaughter than slaughter groups with a low degree of colonisation Campylobacter jejuni is the Campylobacter sp. predominantly found in broilers. Strain characterisation below species level, so-called subtyping, is a helpful tool in epidemiological studies, e.g. in determination of transmission routes. Certain subtypes were shown to be common in Sweden and may have a higher ability to survive in the environment around broiler houses. The results from phylogenetic analysis indicated that typing based on 16S rRNA sequencing is not always sufficient for differentiating between C. jejuni and C. coli. However, nine different 16S rRNA types were identified among 47 Swedish campylobacter isolates from broilers. About one-third of Swedish broiler producers seldom deliver any campylobacter-positive broilers to slaughter, demonstrating that it is possible to produce campylobacter-free chickens in Sweden. The factors identified as carrying the highest risk of producing campylobacter-positive broilers in Sweden were (i) insufficient general tidiness on the farm, (ii) split slaughter, (iii) an in-line position of the doors between the outside and access into broiler houses instead of an angled position. Furthermore, (iv) high risk farms often had other livestock such as cattle and pigs, and (v) high risk farms were more frequently situated in groves than in forest. Reducing the proportion of campylobacter-infected broiler flocks and the numbers of campylobacter on broiler carcasses would considerably lower the risk for consumers.

Authors/Creators:Hansson, Ingrid
Title:Bacteriological and epidemiological studies of campylobacter spp. in Swedish broilers
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :May 2007
Number of Pages:56
ALLI Hansson, I., Engvall, E.O., Lindblad, J., Gunnarson, A. & Vågsholm, I. 2004. The Campylobacter surveillance program for broilers in Sweden, July 2001-June 2002. Veterinary Record 155, 193-196. II Hansson, I., Ederoth, M., Andersson, L., Vågsholm, I. & Olsson Engvall, E. 2005. Transmission of Campylobacter spp. to chickens during transport to slaughter. Journal of Applied Microbiology 99, 1149-1157. III Lindblad, M., Hansson, I., Vågsholm, I. & Lindqvist, R. 2006. Post-chill Campylobacter prevalence on broiler carcasses in relation to slaughter group colonization level and chilling system. Journal of Food Protection 69, 495-499. IV Hansson, I., Vågsholm, I., Andersson, L. & Olsson Engvall, E. 2007. Correlations between Campylobacter spp. prevalence in the environment and broiler flocks. Journal of Applied Microbiology. Article published online: 7-Feb-2007 doi: 10.1111/j.1365-2672.2007.03291.x V Hansson, I., Olsson Engvall E. & Vågsholm I. Risk factors for Campylobacter spp. in Swedish broiler flocks. Submitted. VI Hansson, I., Persson, M., Svensson, L., Olsson Engvall, E. & Johansson, K-E. Sequence diversity of the 16S rRNA genes of Campylobacter spp. from broilers. Submitted.
Place of Publication:Uppsala
ISBN for printed version:978-91-576-7362-6
Publication Type:Doctoral thesis
Full Text Status:Public
Agrovoc terms:campylobacter jejuni, broiler chickens, epidemiology, disease surveys, disease transmission, biological contamination, foodborne diseases, transport of animals, slaughtering, environmental factors, analytical methods, laboratory diagnosis, sweden
Keywords:Campylobacter, broilers, epidemiology, Sweden, surveillance, environment, transport, slaughter, 16S rRNA sequencing
Permanent URL:
ID Code:1461
Department:(VH) > Dept. of Biomedical Sciences and Veterinary Public Health
Deposited By: Ingrid Hansson
Deposited On:15 May 2007 00:00
Metadata Last Modified:02 Dec 2014 10:12

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