Methicillin-resistant Staphylococcus aureus, Samoa, 2007-2008.

Area of Science:

• Microbiology
• Epidemiology
• Infectious Diseases

Background:

• Limited data exists on methicillin-resistant Staphylococcus aureus (MRSA) epidemiology in Pacific Island nations.
• Previous studies indicate higher MRSA rates among Polynesian populations outside the Pacific.
• Skin and soft tissue infections are common, necessitating local epidemiological data.

Purpose of the Study:

• To determine the prevalence of MRSA in Samoa.
• To characterize the genetic makeup of MRSA strains circulating in Samoa.
• To inform public health strategies for antimicrobial resistance in the region.

Main Methods:

• Prospective study involving 399 individuals with skin and soft tissue infections in Samoa.
• Collection and analysis of wound swabs for Staphylococcus aureus and MRSA identification.
• Genotyping of MRSA isolates to determine common strains and their origins.

Main Results:

• MRSA was detected in 9% of participants, with 34 of 196 Staphylococcus aureus isolates being MRSA.
• Five distinct MRSA genotypes were identified.
• USA300, the Queensland clone, and a novel sequence type 1 MRSA strain were the most prevalent; the Southwest Pacific MRSA clone was less common (12% of isolates).

Conclusions:

• The high prevalence of MRSA in Samoa underscores the need for enhanced antimicrobial resistance surveillance.
• Findings support the implementation of improved infection control measures and antimicrobial stewardship programs in Pacific Island nations.
• Further research into MRSA transmission dynamics and prevention strategies is warranted.