The emergence of Staphylococcus aureus ST398

Area of Science:

• Microbiology
• Epidemiology
• Public Health

Background:

• Methicillin-resistant Staphylococcus aureus (MRSA) has evolved from a hospital-acquired pathogen to community-acquired infections.
• A novel group of MRSA strains linked to livestock, especially swine, has emerged globally.
• Livestock-associated MRSA (LA-MRSA) strains are now found in humans and animals across continents.

Purpose of the Study:

• To review the emergence and characteristics of livestock-associated MRSA (LA-MRSA).
• To describe the epidemiology, colonization, and clinical infections associated with the dominant ST398 strain.
• To discuss research gaps and strategies for controlling LA-MRSA spread.

Main Methods:

• Review of existing literature on MRSA epidemiology.
• Analysis of molecular typing data for LA-MRSA strains, focusing on ST398.
• Synthesis of information on human and animal infections and colonization.

Main Results:

• The ST398 strain is the predominant type of LA-MRSA identified globally.
• LA-MRSA has been detected in humans and animals in Europe, North America, and Asia.
• Colonization and clinical infections in humans are increasingly linked to this strain.

Conclusions:

• The emergence of LA-MRSA, particularly ST398, represents a significant epidemiological shift.
• Understanding transmission dynamics is crucial for controlling spread in agricultural and community settings.
• Further research is needed to address control strategies and potential public health implications.