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Characterization of a Pathogenic Escherichia coli Strain Derived from Oreochromis spp. Farms Using Whole-Genome Sequencing
Published on: December 23, 2022
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Enteropathogenic Escherichia coli in Psittaciformes.
Avian Pathology : Journal of the W.V.P.A
|February 25, 2016
Summary
Shiga toxin-producing Escherichia coli are rare in pet birds, but enteropathogenic E. coli (EPEC) were found. These EPEC strains may pose a risk for human infections, highlighting the importance of avian disease surveillance.
Area of Science:
- Veterinary Microbiology
- Avian Pathology
- Zoonotic Diseases
Background:
- Escherichia coli (E. coli) can cause disease in various animals, including birds.
- Certain E. coli strains, like Shiga toxin-producing E. coli (STEC) and enteropathogenic E. coli (EPEC), are significant pathogens.
- Psittaciform birds are common pets and can potentially harbor and transmit E. coli.
Purpose of the Study:
- To investigate the prevalence of Shiga toxin genes (Stx1, Stx2) and the intimin gene (eae) in E. coli isolates from psittaciform birds.
- To identify potential enteropathogenic E. coli (EPEC) strains in this avian population.
- To assess the risk of psittaciform birds as a source of human E. coli infections.
Main Methods:
- Polymerase chain reaction (PCR) was used to detect Stx1, Stx2, eae, and bfpA genes in 103 E. coli isolates from psittaciform birds.
- Isolates were obtained from necropsy cases, fecal samples, and cloacal swabs.
- Phenotypic tests for Shiga toxin and HlyEHEC were also performed.
Main Results:
- No Shiga toxin-producing E. coli (STEC) or HlyEHEC were detected in any of the isolates.
- Seven E. coli isolates harbored the eae gene, with three belonging to serotype O110:H6 and one to O131:H-.
- Four of the eae-positive strains were identified as EPEC due to the presence of the bfpA gene.
Conclusions:
- Shiga toxin-producing E. coli appear to be uncommon in psittaciform birds.
- Enteropathogenic E. coli (EPEC) strains are present in this avian population and should be considered potential pathogens.
- Psittaciform birds may serve as a reservoir for human EPEC infections, warranting further investigation and surveillance.
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