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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

In-vivo evaluation of pathogenicity and antimicrobial profile susceptibility from Escherichia coli samples isolated from commercial layer hens

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Author(s):
Elisabete Aparecida Lopes Guastalli [1] ; Marcos Roberto Buim [2] ; Bruno Henrique Lopes Guastalli [3] ; Fernando Antonio de Ávila [4]
Total Authors: 4
Affiliation:
[1] Instituto Biológico. CAPTAA. Unidade de Pesquisa e Desenvolvimento de Bastos - Brasil
[2] Instituto Biológico. CAPTAA. Unidade de Pesquisa e Desenvolvimento de Bastos - Brasil
[3] Universidade Estadual Paulista “Júlio de Mesquita Filho”. Faculdade de Ciências Agrárias e Veterinárias de Jaboticabal - Brasil
[4] Universidade Estadual Paulista “Júlio de Mesquita Filho”. Faculdade de Ciências Agrárias e Veterinárias de Jaboticabal - Brasil
Total Affiliations: 4
Document type: Journal article
Source: Arq. Inst. Biol.; v. 85, 2018-07-02.
Abstract

ABSTRACT: Antimicrobial sensitivity and pathogenicity level of 90 strains of Escherichia coli isolated from livers and intestines from commercial layer hens presenting diarrhea were analyzed. To evaluate the antimicrobial susceptibility, all samples were subjected to antimicrobial susceptibility testing using 11 commercial drugs. The results have showed none of the strains was susceptible to all antibiotics tested. All samples showed resistance to two or more drugs. According to the mortality rate of the birds, the in-vivo pathogenicity test classifies the strains into four classes: high, intermediate, low and nonpathogenic. The test has showed 23 (25.5%) of the samples were highly pathogenic, 21 (23.3%) of intermediate pathogenicity, 23 (25.5%) low pathogenic, and 23 (25.5%) non-pathogenic. When the results of the classes of pathogenicity from isolates have been associated with antimicrobial susceptibility, nonpathogenic strains were less sensitive to the antibiotic ampicillin and increased sensitive to streptomycin antimicrobial compared to the others classes of pathogenic. Nonpathogenic strains showed resistance to many antimicrobials, an alert for poultry, since these bacteria might acquire the virulence genes and infect birds, others animals and even human beings. (AU)

FAPESP's process: 09/02066-3 - Study of virulence factors from escheria coli strains isolated from layer chicks
Grantee:Fernando Antonio de Avila
Support Opportunities: Regular Research Grants