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Salmonella source attribution in a subtropical state of Australia: capturing environmental reservoirs of infection

  • E. J. Fearnley (a1), A. Lal (a1), J. Bates (a2), R. Stafford (a3), M.D. Kirk (a1) and K. Glass (a1)...
Abstract

Salmonellosis is a leading cause of hospitalisation due to gastroenteritis in Australia. A previous source attribution analysis for a temperate state in Australia attributed most infections to chicken meat or eggs. Queensland is in northern Australia and includes subtropical and tropical climate zones. We analysed Queensland notifications for salmonellosis and conducted source attribution to compare reservoir sources with those in southern Australia. In contrast to temperate Australia, most infections were due to non-Typhimurium serotypes, with particularly high incidence in children under 5 years and strong seasonality, peaking in summer. We attributed 65.3% (95% credible interval (CrI) 60.6–73.2) of cases to either chicken meat or eggs and 15.5% (95% CrI 7.0–19.5) to nuts. The subtypes with the strongest associations with nuts were Salmonella Aberdeen, S. Birkenhead, S. Hvittingfoss, S. Potsdam and S. Waycross. All five subtypes had high rates of illness in children under 5 years (ranging from 4/100 000 to 23/100 000), suggesting that nuts may be serving as a proxy for environmental transmission in the model. Australia's climatic range allows us to conduct source attribution in different climate zones with similar food consumption patterns. This attribution provides evidence for environment-mediated transmission of salmonellosis in sub-tropical regions.

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Corresponding author
Author for correspondence: K. Glass, E-mail: kathryn.glass@anu.edu.au
References
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1.Kirk, M et al. (2014) Foodborne illness, Australia, circa 2000 and circa 2010. Emerging Infectious Diseases 20, 18571864.
2.Ford, L et al. (2014) Sequelae of foodborne illness caused by 5 pathogens, Australia, circa 2010. Emerging Infectious Diseases 20, 18651871.
3.Ford, L et al. (2016) Increasing incidence of Salmonella in Australia, 2000–2013. PLoS ONE 11, e0163989.
4.Moffatt, CR et al. (2016) Salmonella Typhimurium and outbreaks of egg-associated disease in Australia, 2001 to 2011. Foodborne Pathogens and Disease 13, 379385.
5.Fearnley, E et al. (2011) Salmonella in chicken meat, eggs and humans; Adelaide, South Australia, 2008. International Journal of Food Microbiology 146, 219227.
6.Hale, CR et al. (2012) Estimates of enteric illness attributable to contact with animals and their environments in the United States. Clinical Infectious Diseases 54(Suppl. 5), S472S479.
7.Sanchez, S et al. (2002) Animal sources of salmonellosis in humans. Journal of the American Veterinary Medical Association 221, 492497.
8.Levantesi, C et al. (2012) Salmonella in surface and drinking water: occurrence and water-mediated transmission. Food Research International 45, 587602.
9.Aiken, AM, Lane, C and Adak, GK (2010) Risk of Salmonella infection with exposure to reptiles in England, 2004–2007. Eurosurveillance 15. pii=19581.
10.Williams, S et al. (2015) Salmonella in the tropical household environment – everyday, everywhere. The Journal of Infection 71, 642648.
11.Hald, T et al. (2004) A Bayesian approach to quantify the contribution of animal-food sources to human salmonellosis. Risk Analysis 24, 255269.
12.Mullner, P et al. (2009) Source attribution of food-borne zoonoses in New Zealand: a modified Hald model. Risk Analysis 29, 970984.
13.Barco, L et al. (2013) Salmonella source attribution based on microbial subtyping. International Journal of Food Microbiology 163, 193203.
14.Mather, AE, Vaughan, TG and French, NP (2015) Molecular approaches to understanding transmission and source attribution in nontyphoidal salmonella and their application in Africa. Clinical Infectious Diseases 61(Suppl. 4), S259S265.
15.Pires, SM et al. (2014) Source attribution of human salmonellosis: an overview of methods and estimates. Foodborne Pathogens and Disease 11, 667676.
16.Mughini-Gras, L et al. (2014) Risk factors for human salmonellosis originating from pigs, cattle, broiler chickens and egg laying hens: a combined case-control and source attribution analysis. PLoS ONE 9, e87933.
17.Guo, C et al. (2011) Application of Bayesian techniques to model the burden of human salmonellosis attributable to U.S. food commodities at the point of processing: adaptation of a Danish model. Foodborne Pathogens and Disease 7, 509516.
18.Glass, K et al. (2016) Bayesian source attribution of salmonellosis in South Australia. Risk Analysis 36, 561570.
19.Australian Demographic Statistics, June 2017. In: Australian Bureau of Statistics, 2017.
20.Australian Health Survey: Nutrition First Results-Foods and Nutrients, 2011–12. In: Australian Bureau of Statistics, 2012.
21.Jordan, D and Morris, S (2006) Analysis of ESAM data. In: Meat and Livestock Australia.
22.Report on the prevalence of Salmonella and E. coli in ready to eat nuts and nut products sold in Australia. In: New South Wales Food Authority, 2012.
23.Hamilton, D et al. (2010) Slaughterfloor decontamination of pork carcases with hot water or acidified sodium chlorite – a comparison in two Australian abattoirs. Zoonoses and Public Health 57(Suppl. 1), 1622.
24.Baseline survey on the prevalence and concentration of Salmonella and Campylobacter in chicken meat on-farm and at primary processing. In: Proposal P282: Primary Production and Processing Standard for Poultry Meat Food Standards Australia New Zealand and the South Australian Research and Development Institute, 2010.
25.Beard, F et al. (2004) Risk factors for sporadic Salmonella Birkenhead infection in Queensland and northern New South Wales: a case-control study. NSW Public Health Bulletin 15, 172177.
26.Scheelings, TF, Lightfoot, D and Holz, P (2011) Prevalence of Salmonella in Australian reptiles. Journal of Wildlife Diseases 47, 111.
27.Munnoch, SA et al. (2009) A multi-state outbreak of Salmonella Saintpaul in Australia associated with cantaloupe consumption. Epidemiology and Infection 137, 367374.
28.Mughini-Gras, L and van Pelt, W (2014) Salmonella source attribution based on microbial subtyping: does including data on food consumption matter? International Journal of Food Microbiology 191, 109115.
29.Groves, PJ et al. (2016) Live and inactivated vaccine regimens against caecal Salmonella Typhimurium colonisation in laying hens. Australian Veterinary Journal 94, 387393.
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Epidemiology & Infection
  • ISSN: 0950-2688
  • EISSN: 1469-4409
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