Susceptibility and virulence profile of Escherichia coli pathotypes isolated from diarrheic and non-diarrheic calves

Authors

DOI:

https://doi.org/10.5433/1679-0359.2021v42n2p695

Keywords:

Colibacillosis, EPEC, ETEC, Salvia officinalis L. STEC.

Abstract

Neonatal diarrhea is amongst the most frequent diseases affecting calves, leading to damages in milk production. Although Escherichia coli is a commensal microorganism in the gastrointestinal tract, some pathotypes are known to cause high prevalence of diarrhea and food poisoning. The rapidly increasing resistance of bacteria to antimicrobials leads to the research in new, alternative treatment options. The present study aimed at the detection of E. coli pathotypes in newborn diarrheic and non-diarrheic calves, as well as susceptibility tests for antimicrobials and vegetal extracts. Samples were collected from animals located in dairy farms in the state of Minas Gerais, Brazil. The samples were sent for microbiological isolation, genetic identification using PCR and antimicrobial tests. A total of 35 strains from diarrheic animals tested positive for at least one of the virulence genes analyzed: stx1, stx2, eae, bfp and sta. As for the non-diarrheic animals, 9 isolated strains possessed one of or both stx1 and stx2 genes, classifying these non-diarrheic cattle as reservoirs for the STEC pathotype and possible biological vectors of this pathogen. Regarding the susceptibility tests, most isolates displayed resistance to multiple antimicrobial classes. Among the vegetal extracts tested, all isolates tested sensitive to the active ingredient of Salvia officinalis L. (sage). Showcasing an alternative tool to aid in the treatment of pathogenic bacteria.

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Author Biographies

Juliana da Silva Menezes Azola, São Paulo State University, School of Agricultural and Veterinary

Master’s Student at the Agropecuary Microbiology Postgraduate Program, São Paulo State University, School of Agricultural and Veterinary Studies, UNESP/FCAV, Jaboticabal, SP, Brazil.

Marita Vedovelli Cardozo, São Paulo State University, School of Agricultural and Veterinary

Postdoctoral Researcher at the Agropecuary Microbiology Postgraduate Program, UNESP/FCAV, Jaboticabal, SP, Brazil.

Bianca de Souza Moreira, Universidade José do Rosário Vellano

Doctoral Student at the Animal Science Postgraduate Program, José do Rosário Vellano University, UNIFENAS, Alfenas, MG, Brazil.

Gabriel Michelutti do Nascimento, São Paulo State University, School of Agricultural and Veterinary

Master’s Student at the Agropecuary Microbiology Postgraduate Program,, UNESP/FCAV, Jaboticabal, SP, Brazil.

Marcelo Fabiano Gomes Boriollo, University of Campinas, School of Dentistry

Collaborating Researcher, University of Campinas, School of Dentistry, Unicamp/FOP, Piracicaba, SP, Brazil.

Fernando Antônio de Ávila, São Paulo State University, School of Agricultural and Veterinary

Full Prof. at the Agropecuary Microbiology Postgraduate Program, UNESP/FCAV, Jaboticabal, SP, Brazil.

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Published

2021-02-24

How to Cite

Azola, J. da S. M., Cardozo, M. V., Moreira, B. de S., Nascimento, G. M. do, Boriollo, M. F. G., & Ávila, F. A. de. (2021). Susceptibility and virulence profile of Escherichia coli pathotypes isolated from diarrheic and non-diarrheic calves. Semina: Ciências Agrárias, 42(2), 695–706. https://doi.org/10.5433/1679-0359.2021v42n2p695

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