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Type of publication: Journal Article
Type of document: Full Paper

Year: 2018

Authors: Gaußmann, B; Hess, C; Grafl, B; Kovacs, M; Troxler, S; Stessl, B; Hess, M; Paudel, S

Title: Escherichia coli isolates from femoral bone marrow of broilers exhibit diverse pheno- and genotypic characteristics that do not correlate with macroscopic lesions of bacterial chondronecrosis with osteomyelitis.

Source: Avian Pathol. 2018; 47(3):271-280



Authors Vetmeduni Vienna:

Gaußmann Barbara
Grafl Beatrice
Hess Claudia
Hess Michael
Paudel Surya
Stessl Beatrix
Troxler Salome

Vetmed Research Units
University Clinic for Poultry and Fish Medicine, Clinical Unit of Poultry Medicine
Institute of Food Safety, Food Technology and Veterinary Public Health, Unit of Food Microbiology


Abstract:
The pheno- and genotypic relatedness among Escherichia coli isolates from broilers with and without macroscopic lesions of the femoral head were investigated. In total, 219 isolates obtained from the bone marrow were characterized by serotyping, antimicrobial resistance (AMR) profiles, phylogenetic grouping, detection of virulence-associated genes (VAGs) and pulsed-field gel electrophoresis (PFGE). Serotyping revealed that 48.4% of the isolates were assigned to one of the three serotypes (O78:K80: 21.0%, O2:K1: 18.7%, O1:K1: 8.7%). Substantial phenotypic variation was also noticed in AMR testing as most of the birds harboured E. coli isolates with different AMR profiles, which is of high clinical relevance. The majority of isolates could be classified into phylogenetic groups D (54.3%) and B2 (25.6%), followed by A (11.4%) and B1 (8.7%). Virulotyping showed that the highest number of isolates contained genes iucD (86.8%) and iss (84.9%), whereas papC (16.0%) and astA (12.3%) were present in least number of isolates. PFGE resulted in 58 different profiles from 200 typeable isolates. No correlation was found between specific serotypes, AMR profiles, phylogenetic groups, PFGE types or VAG profiles of E. coli and the occurrence of bacterial chondronecrosis with osteomyelitis, contradicting the hypothesis of a specific bacterial pheno- or genotype being involved in the disease.


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