MRSA accounts for more than what proportion of Staphylococcus aureus infections in many communities?

• A. More than 50%
• B. About 10%
• C. About 75%
• D. About 90%

Answer: (A)

The main idea is the prevalence of MRSA among Staphylococcus aureus infections in the community. In many communities, MRSA has become the majority cause, meaning it accounts for more than half of S. aureus infections. This reflects the rise of community-associated MRSA strains and their spread, especially in skin and soft tissue infections. Proportions vary by locale, but describing MRSA as accounting for more than half is consistent with surveillance data from many areas. The other options imply much lower or much higher shares that don’t accurately represent the typical distribution in many communities. This shift also helps explain why empiric therapy for suspicious S. aureus infections often needs MRSA coverage in populations with high prevalence.