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Risk Factors for Positivity to Shiga Toxin-Producing Escherichia coli and Salmonella enterica in Backyard Production Systems Animals from Metropolitana Region, Chile: A Threat to Public Health?

Author

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  • Erika Pavez-Muñoz

    (Departamento de Medicina Preventiva Animal, Facultad de Ciencias Veterinarias y Pecuarias, Universidad de Chile, Santiago 8820808, Chile
    Central Veterinary Research Laboratory, Facultad de Ciencias Veterinarias y Pecuarias, Universidad de Chile, Santiago 8820808, Chile)

  • Bastián Fernández-Sanhueza

    (Departamento de Medicina Preventiva Animal, Facultad de Ciencias Veterinarias y Pecuarias, Universidad de Chile, Santiago 8820808, Chile
    Central Veterinary Research Laboratory, Facultad de Ciencias Veterinarias y Pecuarias, Universidad de Chile, Santiago 8820808, Chile)

  • Constanza Urzúa-Encina

    (Departamento de Medicina Preventiva Animal, Facultad de Ciencias Veterinarias y Pecuarias, Universidad de Chile, Santiago 8820808, Chile
    Central Veterinary Research Laboratory, Facultad de Ciencias Veterinarias y Pecuarias, Universidad de Chile, Santiago 8820808, Chile)

  • Nicolás Galarce

    (Departamento de Medicina Preventiva Animal, Facultad de Ciencias Veterinarias y Pecuarias, Universidad de Chile, Santiago 8820808, Chile)

  • Raúl Alegría-Morán

    (Central Veterinary Research Laboratory, Facultad de Ciencias Veterinarias y Pecuarias, Universidad de Chile, Santiago 8820808, Chile
    Facultad de Ciencias Agropecuarias y Ambientales, Universidad del Alba, Santiago 8370007, Chile)

Abstract

In the Metropolitana region of Chile there are 3836 backyard production systems (BPS), characterized as small-scale systems. They act as a source of zoonotic pathogens, such as Salmonella enterica and Shiga toxin-producing Escherichia coli (STEC), whose prevalence in BPS has not been fully described. The objective of this study was to determine the positivity for both agents in BPS and to establish the risk factors related to their presence. In each BPS, an epidemiological survey was undertaken, and stool samples were collected to detect these pathogens via bacteriological culture and conventional PCR techniques. Subsequently, multivariable logistic regression models were applied to establish the risk factors associated with their presence. BPS positivity rates of 11.76% for STEC and 4.7% for S. enterica were observed. The systems showed poor welfare standards and a lack of biosecurity measures. The risk factor analysis concluded that the Gini–Simpson index ( p = 0.030; OR = 1.717) and the presence of neighboring intensive poultry or swine production systems ( p = 0.019; OR = 20.645) act as factors that increased the risk of positivity with respect to STEC. In the case of S. enterica , exchanging embryonated eggs ( p = 0.021; OR = 39) and the presence of debeaked chickens ( p = 0.001; OR = 156) were determined as factors that increased the risk of positivity for this agent. For positivity with respect to both pathogens, the Gini–Simpson index ( p = 0.030; OR = 1.544) and being INDAP/PRODESAL users ( p = 0.023; OR = 15.026) were determined as factors that increased the risk, whereas the type of confinement ( p = 0.002; OR = 0.019) decreased it. Epidemiological surveillance of these neglected populations is lacking, highlighting the fact that STEC and S. enterica maintenance on BPS represents a potential threat to public health.

Suggested Citation

  • Erika Pavez-Muñoz & Bastián Fernández-Sanhueza & Constanza Urzúa-Encina & Nicolás Galarce & Raúl Alegría-Morán, 2021. "Risk Factors for Positivity to Shiga Toxin-Producing Escherichia coli and Salmonella enterica in Backyard Production Systems Animals from Metropolitana Region, Chile: A Threat to Public Health?," IJERPH, MDPI, vol. 18(20), pages 1-16, October.
    • Handle: RePEc:gam:jijerp:v:18:y:2021:i:20:p:10730-:d:655609
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    References listed on IDEAS

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    1. Nerino Allocati & Michele Masulli & Mikhail F. Alexeyev & Carmine Di Ilio, 2013. "Escherichia coli in Europe: An Overview," IJERPH, MDPI, vol. 10(12), pages 1-20, November.
    2. Romain Espinosa & Damian Tago & Nicolas Treich, 2020. "Infectious Diseases and Meat Production," Environmental & Resource Economics, Springer;European Association of Environmental and Resource Economists, vol. 76(4), pages 1019-1044, August.
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    Cited by:

    1. Beate Conrady, 2021. "Epidemiological, Mitigation and Economic Impact of Zoonoses," IJERPH, MDPI, vol. 18(21), pages 1-5, November.

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