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Molecular epidemiological tools for Salmonella Dublin typing
A Kerouanton1, A Brisabois, J Grout
1Laboratoire de Microbiologie, Faculté de Médecine de Brest, France.
FEMS Immunology and Medical Microbiology
|May 1, 1996
Summary
This study differentiated Salmonella Dublin cattle strains using multiple genetic methods. Combining techniques like ribotyping and arbitrarily primed PCR (AP-PCR) improved strain discrimination, revealing greater diversity than single methods.
Area of Science:
- Veterinary Microbiology
- Molecular Biology
- Bacterial Genetics
Background:
- Salmonella Dublin is a significant pathogen in cattle.
- Accurate strain differentiation is crucial for understanding transmission and control.
- Previous typing methods showed limited discriminatory power for cattle-adapted S. Dublin.
Purpose of the Study:
- To evaluate and compare the discriminatory power of five molecular typing methods for Salmonella Dublin strains from cattle.
- To determine the optimal combination of methods for enhanced strain typing.
- To assess the genetic diversity within cattle-associated S. Dublin.
Main Methods:
- Zymotyping (esterase electrophoresis)
- Ribotyping (ribosomal DNA restriction fragment length polymorphism)
- Arbitrarily primed PCR (AP-PCR)
- Repetitive extragenic palindromic PCR (REP-PCR)
- Enterobacterial repetitive intergenic consensus PCR (ERIC-PCR)
Main Results:
- Single methods yielded limited types: ERIC-PCR and REP-PCR (1 type each), zymotyping (3 types), AP-PCR (5 types), and ribotyping (7 types).
- Combining ribotyping and AP-PCR yielded 11 types.
- Utilizing all five methods achieved the highest discrimination, identifying 14 distinct types.
- These results indicate greater genetic heterogeneity among cattle-adapted S. Dublin than previously recognized.
Conclusions:
- A combination of molecular typing methods significantly enhances the discriminatory capacity for Salmonella Dublin strains.
- Multi-method approaches are essential for resolving the genetic diversity of seemingly homogeneous bacterial populations like cattle-adapted S. Dublin.
- Improved strain typing facilitates targeted epidemiological investigations and control strategies for bovine salmonellosis.