Epidemiology of methicillin resistant Staphylococcus species carriage in companion animals in the Greater Brisbane Area, Australia.

This research investigates the occurrence of antibiotic-resistant Staphylococcus bacteria in pets and horses in South East Queensland, Australia. The study found that 8.7% of dogs carry methicillin-resistant Staphylococcus pseudintermedius, and this is influenced by factors such as previous hospitalization, infection history, type of veterinary consultation, and the weather and population density in the pet’s location.

Research Methodology

• The researchers took swab samples from dogs, cats, and horses in South East Queensland in order to detect the presence of two types of methicillin resistant Staphylococcus bacteria: Staphylococcus aureus (MRSA) and S. pseudintermedius (MRSP).
• The samples were then tested for these bacteria, allowing the researchers to determine the proportion of animals carrying these antibiotic-resistant strains.

Research Findings

• The study found that 8.7% of dogs were carriers of MRSP, while this type of bacteria was not detected in any of the cat or horse samples.
• No MRSA bacteria was detected in any of the samples.
• The research also showed that several factors increased the likelihood of an animal carrying MRSP. These included previous hospitalisation (suggesting that the bacteria may be acquired during clinical treatment), a history of bacterial infection, and the type of veterinary consultation.
• Ambient factors such as average precipitation and human population density were also found to increase the probability of MRSP carriage. This suggests that environmental conditions and human-animal interaction could play a role in the spread of this bacteria.

Interpretation of Findings

• Given that the prevalence of MRSP was highest in specific locations (Brisbane city, Sunshine Coast and Gympie), the researchers concluded that MRSP carriage in dog populations from South East Queensland is geographically clustered. This means that the occurrence of MRSP could be related to location-specific factors, although further research would be necessary to identify these precisely.
• In associating MRSP carriage with a set of clinical, environmental, and demographic factors, the study contributes to our understanding of how antibiotic resistance spreads in animal populations. This knowledge can be used to inform strategies for managing and reducing the prevalence of antibiotic-resistant bacteria.