What is the most common causative agent of infection with puncture wounds?

What is the most common causative agent of infection with puncture wounds?

• A. Pseudomonas aeruginosa
• B. Staphylococcus aureus
• C. Escherichia coli
• D. Streptococcus pyogenes

Answer: (B)

Staphylococcus aureus is the usual culprit in wound infections because it is the most common skin flora that breaches the barrier and invades soft tissues. Puncture wounds allow skin flora to seed the wound, and S. aureus readily causes purulent infections and cellulitis in these scenarios. While Pseudomonas is classically taught as a concern for puncture wounds through footwear or contaminated environments, it is not the most common organism overall. E. coli and Streptococcus pyogenes cause wound infections less frequently in this setting. Therefore, Staphylococcus aureus is the best answer. In practice, empiric therapy should cover Staph species (including MRSA where prevalence is high).

Staphylococcus aureus is the usual culprit in wound infections because it is the most common skin flora that breaches the barrier and invades soft tissues. Puncture wounds allow skin flora to seed the wound, and S. aureus readily causes purulent infections and cellulitis in these scenarios. While Pseudomonas is classically taught as a concern for puncture wounds through footwear or contaminated environments, it is not the most common organism overall. E. coli and Streptococcus pyogenes cause wound infections less frequently in this setting. Therefore, Staphylococcus aureus is the best answer. In practice, empiric therapy should cover Staph species (including MRSA where prevalence is high).