Methicillin-resistant staphylococci in companion animals

Area of Science:

• Veterinary Microbiology
• Infectious Diseases
• Molecular Epidemiology

Background:

• Methicillin-resistant Staphylococcus aureus (MRSA) poses a significant One Health challenge, with potential for zoonotic transmission.
• Understanding MRSA reservoirs and transmission pathways in veterinary settings is crucial for infection control.
• Small animal and equine hospitals can serve as potential hubs for MRSA dissemination between animals and humans.

Purpose of the Study:

• To determine the molecular characteristics of methicillin-resistant staphylococci isolated from animals and hospital staff.
• To investigate potential transmission links of MRSA between companion animals, horses, and veterinary personnel.
• To compare MRSA strains found in different host species within a single veterinary hospital environment.

Main Methods:

• Isolation and molecular typing (e.g., whole-genome sequencing or spa typing) of methicillin-resistant staphylococci.
• Sampling of animals (dogs, horses) and hospital staff.
• Comparative analysis of MRSA strain profiles across host species and personnel.

Main Results:

• A methicillin-resistant Staphylococcus aureus (MRSA) strain identical to the human EMRSA-15 was identified in dogs and hospital staff.
• Five distinct MRSA strains were isolated from horses, indicating a separate reservoir.
• No overlap was observed between MRSA strains found in horses and those carried by hospital staff.

Conclusions:

• Dogs and hospital staff shared a common MRSA strain (EMRSA-15), suggesting potential for human-to-dog or dog-to-human transmission.
• Horses represented a distinct reservoir for different MRSA strains, with no apparent transmission to hospital staff.
• These findings highlight the complex epidemiology of MRSA in veterinary settings and the need for species-specific surveillance.