Methicillin-resistant staphylococcal colonization in clinically normal dogs and horses in the community.

The study investigates the prevalence of methicillin-resistant staphylococcal (MRS) colonization in healthy dogs and horses in a community setting. No Methicillin-resistant Staphylococcus aureus (MRSA) was detected, but Methicillin-resistant Staphylococcus intermedius (MRSI) and Methicillin-resistant coagulase negative staphylococci (MRCoNS) were present in some animals.

Research Methodology

• The study was conducted on a total of 300 horses and 200 dogs, all of which were clinically normal, meaning they showed no signs of disease or infection.
• A nasal swab was collected from each horse, while two swabs were taken from each dog – one from the nose, and another from the perineal area and 0.5cm into the anus.
• These swabs were then cultured in the lab to identify any presence of methicillin-resistant staphylococci.

Research Findings

• No instances of the MRSA form of staphylococci were identified in any of the sampled animals.
• MRSI was found in the nasal swabs of three out of the 200 dogs sampled.
• MRCoNS, another strain of methicillin-resistant staphylococci, were found in 42% of the horses and 13% of the dogs.

Conclusion and Implications

• The researchers conclude that while MRSI is currently not a significant concern for zoonotic diseases (those that can be transmitted from animals to humans), it could potentially become a key pathogen in dogs.
• Meanwhile, MRCoNS primarily affect plants and animals that are already compromised; however, these bacteria can also act as a reservoir of resistance, potentially leading to the emergence of new MRSA strains in the community.
• The study is the first to report on the prevalence of MRS colonization in clinically healthy dogs within a community setting.
• Given these findings, the researchers suggest continuous surveillance to monitor if MRSA will arise in the animal population and pose a threat to animal health and zoonotic infection.