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Improvement of the identification of staphylococci isolated from bovine mammary infections using molecular methods
M Bes1, V Guérin-Faublée, H Meugnier
1Centre National de Référence des Toxémies à Staphylocoques, UPRES EA 1655, Laboratoire de Bactériologie, Faculté de Médecine R.T.H. Laennec, Lyon, France.
Abstract:
Fifty-six Staphylococcus strains isolated from cases of bovine mammary infections were identified by using phenotypic and genotypic methods. Twenty-eight strains (50%) were identified at the species level according to their phenotypic characteristics, whereas the remaining 28 strains presented atypical or unreliable profiles. A combination of phenotypic and genotypic methods allowed the 56 strains studied to be classified. Internal transcribed spacer-polymerase chain reaction (ITS-PCR) based on the polymorphism of the 16S-23S rDNA spacer region appeared as a rapid and reliable method for the classification of bovine staphylococcal isolates at the species and subspecies levels.
Insights
Accurate identification of bovine Staphylococcus strains from mammary infections is crucial. Internal transcribed spacer-polymerase chain reaction (ITS-PCR) offers a reliable method for classifying these bacterial isolates.
Area of Science:
- Veterinary Microbiology
- Bacterial Genetics
- Bovine Health
Background:
- Bovine mastitis is frequently caused by Staphylococcus species.
- Accurate identification of bacterial pathogens is essential for effective treatment and control.
- Phenotypic identification methods can be unreliable for certain bacterial strains.
Purpose of the Study:
- To evaluate the efficacy of phenotypic and genotypic methods for identifying Staphylococcus strains from bovine mastitis.
- To determine the reliability of internal transcribed spacer-polymerase chain reaction (ITS-PCR) for classifying these isolates.
Main Methods:
- Isolation and characterization of 56 Staphylococcus strains from bovine mammary infections.
- Phenotypic identification based on biochemical characteristics.
- Genotypic identification using internal transcribed spacer-polymerase chain reaction (ITS-PCR) targeting the 16S-23S rDNA spacer region.
Main Results:
- Phenotypic methods accurately identified only 50% of the Staphylococcus strains.
- The remaining 28 strains exhibited atypical or unreliable phenotypic profiles.
- ITS-PCR provided rapid and reliable species and subspecies level classification for all 56 strains.
Conclusions:
- Phenotypic identification alone is insufficient for accurate classification of all Staphylococcus strains in bovine mastitis.
- ITS-PCR is a valuable and dependable tool for the precise identification of bovine staphylococcal isolates.
- This method aids in understanding the epidemiology and management of bovine mammary infections.