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 (BCO).

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 (BCO). Avian Pathol. 2018 Feb 16;:1-33 Authors: Gaußmann B, Hess C, Grafl B, Kovacs M, Troxler S, Stessl B, Hess M, Paudel S Abstract The pheno- and genotypic relatedness among Escherichia coli isolates from broilers with and without macroscopic lesions on the femoral head were investigated. In total, 219 isolates obtained from the bone marrow were characterized by serotyping, antimicrobial resistance profiles (AMR), phylogenetic grouping, detection of virulence-associated genes (VAG) 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 antimicrobial resistance 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 into 58 different profiles from 200 typeable isolates. No corre...
Source: Avian Pathology - Category: Pathology Authors: Tags: Avian Pathol Source Type: research

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