The impact of biosecurity and partial depopulation on Campylobacter prevalence in Irish broiler flocks with differing levels of hygiene and economic performance

References

• EFSA Panel on Biological Hazards (BIOHAZ). Scientific opinion on Campylobacter in broiler meat production: control options and performance objectives and/or targets at different stages of the food chain. EFSA J. 2011; 9: 2105.
   Google Scholar
• European Food Safety Authority and European Centre for Disease Prevention and Control. Trends and sources of zoonoses, zoonotic agents and food-borne outbreaks in 2014. EFSA J. 2015; 13: 4329.
   Web of Science ®Google Scholar
• European Food Safety Association. Scientific opinion on quantification of the risk posed by broiler meat to human campylobacteriosis in the EU. EFSA J. 2010; 8: 1–89.
   Google Scholar
• Health Service Executive. Health protection surveillance centre annual report 2011. 2011; Dublin: Health Service Executive. 1–163.
   Google Scholar
• Central Statistics Office. Poultry income taken by the Irish state for 2014: agricultural output, input and income. Available from: http://www.cso.ie/px/pxeirestat/Database/eirestat/AgriculturalOutputInputandIncome/AgriculturalOutputInputandIncome_statbank.asp?SP=AgriculturalOutput,InputandIncome&Planguage=0 [cited 6 January 2016]..
   Google Scholar
• Food Safety Authority of Ireland. Recommendations for a practical control programme for Campylobacter in the poultry production and slaughter chain. Report of the Scientific Committee of the Food Safety Authority of Ireland. 2011; 1–44. Available from: https://www.fsai.ie/recommendationsforapracticalcontrolprogrammeforcampylobacterinthepoultryproduction-andslaughterchain.html [cited 6 February 2016].
   Google Scholar
• Gibbens JC, Pascoe SJS, Evans SJ, Davies RH, Sayers AR. A trial of biosecurity as a means to control Campylobacter infection of broiler chickens. Prev Vet Med. 2001; 48: 85–99.
   Google Scholar
• Katsma WEA, De Koeijer AA, Jacobs-Reitsma WF, Mangen MJJ, Wagenaar JA. Assessing interventions to reduce the risk of Campylobacter prevalence in broilers. Risk Anal. 2007; 27: 863–76.
   Google Scholar
• Newell DG, Elvers KT, Dopfer D, Hansson I, Jones P, James S, etal. Biosecurity-based interventions and strategies to reduce Campylobacter spp. on poultry farms. Appl Environ Microbiol. 2011; 77: 8605–14.
   Google Scholar
• Hald B, Sommer HM, Skovgård H. Use of fly screens to reduce Campylobacter spp. introduction in broiler houses. Emerg Infect Dis. 2007; 13: 1951–3.
   Google Scholar
• Hue O, Le Bouquin S, Laisney MJ, Allain V, Lalande F, Petetin I, etal. Prevalence of and risk factors for Campylobacter spp. contamination of broiler chicken carcasses at the slaughterhouse. Food Microbiol. 2010; 27: 992–9.
   Google Scholar
• Sommer H, Heuer O, Sørensen A, Madsen M. Analysis of factors important for the occurrence of Campylobacter in Danish broiler flocks. Prev Vet Med. 2013; 111: 100–11.
   Google Scholar
• Koolman L, Whyte P, Bolton DJ. An investigation of broiler caecal Campylobacter counts at first and second thinning. J Appl Microbiol. 2014; 117: 876–81.
   Google Scholar
• Hald B, Rattenborg E, Madsen M. Role of batch depletion of broiler houses on the occurrence of Campylobacter spp. in chicken flocks. Lett Appl Microbiol. 2001; 32: 253–6.
   Google Scholar
• Patriarchi A, Fox A, Maunsell B, Fanning S, Bolton D. Molecular characterization and environmental mapping of Campylobacter isolates in a subset of intensive poultry flocks in Ireland. Foodborne Pathog Dis. 2011; 8: 99–108.
   Google Scholar
• Evans SJ, Sayers AR. A longitudinal study of Campylobacter infection of broiler flocks in Great Britain. Prev Vet Med. 2000; 46: 209–23.
   Google Scholar
• Bouwknegt M, van de Giessen A, Dam-Deisz WDC, Havelaar AH, Nagelkerke NJD, Henken AM. Risk factors for the presence of Campylobacter spp. in Dutch broiler flocks. Prev Vet Med. 2004; 62: 35–49.
   Google Scholar
• Wang G, Clark CG, Taylor TM, Pucknell C, Barton C, Price L, etal. Colony multiplex PCR assay for identification and differentiation of Campylobacter jejuni, C. coli, C. lari, C. upsaliensis, and C. fetus subsp. Fetus J Clin Microbiol. 2002; 40: 4744–7. [PubMed Abstract].
   Google Scholar
• Altman DG, Chatfield C, Zidek J. Comparing groups – continuous data. Practical statistics for medical research . 1990; Florida: Chapman & Hall/CRC. 194–6. 1st ed.
   Google Scholar
• Hanley A, McNeil J. The meaning and use of the area under a receiver operating characteristic (ROC) curve. Radiology. 1982; 143: 29–36.
   Google Scholar
• Jewell NP, Chatfield C, Tanner M, Zidek J. Estimation and interference for measures of association. Statistics for epidemiology . 2003; Florida: Chapman & Hall/CRC. 81–4. 1st ed.
   Google Scholar
• European Food Safety Authority. Analysis of the baseline survey on the prevalence of Campylobacter in broiler batches and of Campylobacter and Salmonella on broiler carcasses, in the EU, 2008. Part B: analysis of factors associated with Campylobacter colonisation of broiler batches and with Campylobacter contamination of broiler carcasses; and investigation of the culture method diagnostic characteristics used to analyse broiler carcass samples. EFSA J. 2010; 8: 1522.
   Google Scholar
• Hald B, Wedderkopp A, Madsen M. Thermophilic Campylobacter spp. in Danish broiler production: a cross-sectional survey and a retrospective analysis of risk factors for occurrence in broiler flocks. Avian Pathol. 2000; 29: 123–31.
   Google Scholar
• van de Giessen AW, Tilburg JJ, Ritmeester WS, van der Plas J. Reduction of Campylobacter infections in broiler flocks by application of hygiene measures. Epidemiol Infect. 1998; 121: 57–66.
   Google Scholar
• Humphrey TJ, Henley A, Lanning DG. The colonization of broiler chickens with Campylobacter jejuni: some epidemiological investigations. Epidemiol Infect. 1993; 110: 601–7.
   Google Scholar
• Devane ML, Nicol C, Ball A, Klena JD, Scholes P, Hudson JA, etal. The occurrence of Campylobacter subtypes in environmental reservoirs and potential transmission routes. J Appl Microbiol. 2005; 98: 980–90.
   Google Scholar
• McDowell SWJ, Menzies FD, McBride SH, Oza AN, McKenna JP, Gordon AW, etal. Campylobacter spp. in conventional broiler flocks in Northern Ireland: epidemiology and risk factors. Prev Vet Med. 2008; 84: 261–76.
   Google Scholar
• Damjanova I, Jakab M, Farkas T, Mészáros J, Galántai Z, Turcsányi I, etal. From farm to fork follow-up of thermotolerant campylobacters throughout the broiler production chain and in human cases in a Hungarian county during a ten-months period. Int J Food Microbiol. 2011; 150: 95–102.
   Google Scholar
• Agunos A, Waddell L, Léger D, Taboada E. A systematic review characterizing on-farm sources of Campylobacter spp. for broiler chickens. PLoS One. 2014; 9: e104905.
   Google Scholar
• Hald B, Skovgård H, Bang DD, Pedersen K, Dybdahl J, Jespersen JB, etal. Flies and Campylobacter infection of broiler flocks. Emerg Infect Dis. 2004; 10: 1490–2.
   Google Scholar
• Ellis-Iversen J, Jorgensen F, Bull S. Risk factors for Campylobacter colonisation during rearing of broiler flocks in Great Britain. Prev Vet Med. 2009; 89: 178–84.
   Google Scholar
• Stanley K, Jones K. Cattle and sheep farms as reservoirs of Campylobacter . J Appl Microbiol. 2003; 94: 104S–13S.
   Google Scholar
• Allen VM, Weaver H, Ridley AM, Harris JA, Sharma M, Emery J, etal. Sources and spread of thermophilic Campylobacter spp. during partial depopulation of Broiler Chicken Flocks. J Food Prot. 2008; 71: 264–70. [PubMed Abstract].
   Google Scholar
• Ridley A, Morris V, Gittins J, Cawthraw S, Harris J, Edge S, etal. Potential sources of Campylobacter infection on chicken farms: contamination and control of broiler-harvesting equipment, vehicles and personnel. J Appl Microbiol. 2011; 111: 233–44.
   Google Scholar
• Lawes JR, Vidal A, Clifton-Hadley FA, Sayers R, Rodgers J, Snow L, etal. Investigation of prevalence and risk factors for Campylobacter in broiler flocks at slaughter: results from a UK survey. Epidemiol Infect. 2012; 140: 1725–37.
   Google Scholar
• Havelaar AH, Mangen MJJ, de Koeijer AA, Bogaardt MJ, Evers EG, Jacobs-Reitsma WF, etal. Effectiveness and efficiency of controlling Campylobacter on broiler chicken meat. Risk Anal. 2007; 27: 831–44.
   Google Scholar