In diabetic foot ulcers with suspected infection and MRSA, which antibiotic regimen would be most appropriate?

In diabetic foot ulcers with suspected infection and MRSA, which antibiotic regimen would be most appropriate?

• A. Amoxicillin-clavulanate
• B. Piperacillin/tazobactam + vancomycin
• C. Cefazolin
• D. Doxycycline

Answer: (B)

Diabetic foot infections are usually polymicrobial, often involving Staphylococcus (including MRSA), streptococci, Gram-negatives, and anaerobes. When MRSA is suspected, initial therapy should include coverage for MRSA plus broad activity against other likely pathogens. A regimen that pairs an anti-pseudomonal/anti-anaerobic beta-lactam (piperacillin/tazobactam) with explicit MRSA coverage (vancomycin) achieves this broad, targeted approach. It protects against MRSA and also treats Gram-negatives and anaerobes, which are common in these infections. The other options either lack MRSA coverage or provide insufficient breadth for a polymicrobial diabetic foot infection, making them less appropriate as empiric therapy.

Diabetic foot infections are usually polymicrobial, often involving Staphylococcus (including MRSA), streptococci, Gram-negatives, and anaerobes. When MRSA is suspected, initial therapy should include coverage for MRSA plus broad activity against other likely pathogens. A regimen that pairs an anti-pseudomonal/anti-anaerobic beta-lactam (piperacillin/tazobactam) with explicit MRSA coverage (vancomycin) achieves this broad, targeted approach. It protects against MRSA and also treats Gram-negatives and anaerobes, which are common in these infections. The other options either lack MRSA coverage or provide insufficient breadth for a polymicrobial diabetic foot infection, making them less appropriate as empiric therapy.