PAEA Surgery End Of Rotation (EOR) Practice Exam

What is the most common pathogen found in wound infections and associated with foreign bodies?

1. Escherichia coli

2. Klebsiella

3. Staphylococcus aureus

4. Pseudomonas aeruginosa

The correct answer is: Staphylococcus aureus

Staphylococcus aureus is recognized as the most common pathogen in wound infections, particularly those associated with foreign bodies. This bacterium is part of the normal flora of the skin and mucous membranes, making it highly prevalent when breaches occur in the skin barrier, such as in surgical wounds or cuts. Its ability to adhere to biomaterials and produce biofilms contributes to its role in infections around foreign bodies, such as catheters and prosthetic devices. In wound scenarios, Staphylococcus aureus can lead to both simple skin infections and more serious conditions such as abscess formation or deeper tissue infections. The presence of foreign bodies can further facilitate infection, as the bacteria can easily attach and proliferate, evading the host's immune response. Additionally, certain strains of Staphylococcus aureus, particularly Methicillin-Resistant Staphylococcus aureus (MRSA), can complicate treatment and management of infections due to their resistance to common antibiotics. While other pathogens such as Escherichia coli and Pseudomonas aeruginosa are also important in specific contexts—particularly in certain types of wounds (like those involving fecal contamination for E. coli or in burn wounds for Pseudomonas)—Staphylococcus aureus stands out