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Bovine mastitis: antimicrobial resistance patterns

J N Davidson, J G Babish, G M Dunny

Journal of the American Veterinary Medical Association

|January 15, 1982

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This study analyzed antimicrobial resistance in bovine mastitis pathogens like Klebsiella spp., Escherichia coli, and Staphylococcus aureus. It identified significant associations between resistances, predicting cross-resistance patterns in these bacteria.

Area of Science:

Veterinary Microbiology
Antimicrobial Resistance
Bovine Health

Background:

Bovine mastitis is a significant economic and animal welfare concern in dairy farming.
Antimicrobial resistance in mastitis-causing pathogens complicates treatment efficacy.
Understanding resistance patterns is crucial for effective disease management.

Purpose of the Study:

To determine the antimicrobial resistance profiles of Klebsiella spp., Escherichia coli, and Staphylococcus aureus from bovine mastitis cases.
To investigate the associations between resistance to different antimicrobials within these bacterial species.
To predict potential cross-resistance patterns based on calculated association values.

Main Methods:

Antimicrobial susceptibility testing was performed on 302 Klebsiella spp., 370 Escherichia coli, and 344 Staphylococcus aureus isolates.

Related Experiment Videos

Resistance to 15 different antimicrobials was evaluated for each isolate.

Two-way combination analysis was used to calculate the degree of association between resistances for each organism.

Main Results:

Significant high and low associations between antimicrobial resistances were identified for all three bacterial species.
An association value greater than 1 suggests an increased probability of co-resistance.
An association value less than 1 indicates a decreased probability of co-resistance, suggesting independent resistance mechanisms.

Conclusions:

The study highlights specific antimicrobial resistance associations in common bovine mastitis pathogens.
These findings can inform targeted antimicrobial selection and guide strategies to mitigate the spread of multi-drug resistance in dairy herds.
Understanding resistance associations is vital for developing effective mastitis treatment protocols and preserving antimicrobial efficacy.