Community-associated methicillin-resistant Staphylococcus aureus: overview and local situation

Area of Science:

• Microbiology
• Infectious Diseases
• Epidemiology

Background:

• Community-associated methicillin-resistant Staphylococcus aureus (CA-MRSA) is emerging globally.
• CA-MRSA differs from healthcare-associated MRSA (HA-MRSA) in antibiotic susceptibility and infection types.
• CA-MRSA strains have diverse genetic backgrounds and virulence factors.

Purpose of the Study:

• To describe the geographic distribution of CA-MRSA molecular subtypes.
• To discuss the local implications of CA-MRSA emergence.

Main Methods:

• Literature review of CA-MRSA genetic analyses using Multi-Locus Sequence Typing (MLST).
• Inclusion of Singapore-specific CA-MRSA data from a local database.

Main Results:

• Epidemic CA-MRSA subtypes are present in most regions analyzed.
• Community MRSA infections surpass susceptible strains in some US areas.
• ST30 clone spread drives increasing CA-MRSA infections in Singapore.

Conclusions:

• The rise of community MRSA is persistent, not transient.
• Local guidelines for CA-MRSA treatment and prevention are essential.
• Proactive measures are needed to avert HA-MRSA-like endemicity or US-like CA-MRSA epidemics.