Methicillin-resistant Staphylococcus aureus ST398 in humans and animals, Central Europe

Area of Science:

• Microbiology
• Epidemiology
• Veterinary Medicine

Background:

• Methicillin-resistant Staphylococcus aureus (MRSA) clonal lineage ST398 is a significant public health concern.
• This MRSA strain has been detected in both human and animal populations, including companion animals and livestock.
• The presence of specific SCCmec elements (types IVa or V) is noted in these isolates.

Purpose of the Study:

• To report the isolation of MRSA ST398 in Germany and Austria.
• To highlight the association of MRSA ST398 with nosocomial ventilator-associated pneumonia.
• To document the occurrence of MRSA ST398 in companion animals.

Main Methods:

• Bacterial isolation and characterization.
• Molecular typing including spa typing and SCCmec element identification.
• Epidemiological investigation of human and animal cases.

Main Results:

• MRSA ST398 isolates with SCCmec types IVa or V were identified in Germany and Austria.
• These isolates were found in colonized and infected humans and companion animals (dogs, pigs, horses).
• A concerning association was observed between these MRSA ST398 cases and hospital-acquired ventilator-associated pneumonia.

Conclusions:

• MRSA ST398 represents a One Health challenge, circulating between animals and humans.
• The strain's presence in healthcare settings, particularly linked to ventilator-associated pneumonia, requires vigilant surveillance and control measures.
• Further research into transmission dynamics and effective interventions is warranted.