Methicillin-resistant and -susceptible Staphylococcus aureus infections in dogs

Area of Science:

• Veterinary Medicine
• Infectious Diseases
• Antimicrobial Resistance

Background:

• Methicillin-resistant Staphylococcus aureus (MRSA) is increasingly recognized as a significant pathogen in animal populations.
• Understanding the differences between MRSA and methicillin-susceptible Staphylococcus aureus (MSSA) infections in dogs is crucial for effective treatment and control.

Purpose of the Study:

• To compare infection types, clinical outcomes, and risk factors for MRSA versus MSSA in dogs.
• To identify specific risk factors associated with MRSA infections in a canine population.

Main Methods:

• A case-control study was conducted from 2001-2007 across 3 veterinary referral hospitals in the US and Canada.
• Analyzed signalment, medical/surgical history, and infection sites in 40 dogs with MRSA and 80 dogs with MSSA.
• Statistical analysis identified significant risk factors for MRSA acquisition.

Main Results:

• Skin and ear infections were most prevalent for both MRSA and MSSA.
• Most dogs (92.3%) with MRSA were discharged.
• Significant risk factors for MRSA included prior antimicrobial drugs (OR 3.84), Beta-lactams (OR 3.58), fluoroquinolones (OR 5.34), and IV catheterization (OR 3.72).

Conclusions:

• Antimicrobial drug use, particularly Beta-lactams and fluoroquinolones, and intravenous catheterization are significant risk factors for MRSA in dogs.
• Prudent antimicrobial stewardship in veterinary settings is strongly advised to mitigate MRSA spread.
• Further research into MRSA pathogenesis and prevention in animals is warranted.