Infection in burns is most commonly due to
**Core Concept**
Infection in burns is a significant complication that can lead to severe morbidity and mortality. The pathogenesis of burn wound infection involves colonization of the wound with microorganisms, which can then progress to invasive infection.
**Why the Correct Answer is Right**
The most common cause of infection in burns is Pseudomonas aeruginosa. This bacterium thrives in the moist environment of a burn wound, where it can produce virulence factors such as pyocyanin and elastase that facilitate its invasion and colonization. Pseudomonas aeruginosa is often introduced into the wound through contaminated water or medical equipment.
**Why Each Wrong Option is Incorrect**
**Option A:** Staphylococcus aureus is a common cause of skin and soft tissue infections, but it is not the most common cause of infection in burns.
**Option B:** Escherichia coli is a gram-negative bacterium that can cause a variety of infections, but it is not typically associated with burn wound infections.
**Option C:** Klebsiella pneumoniae is a gram-negative bacterium that can cause respiratory and urinary tract infections, but it is not the most common cause of infection in burns.
**Clinical Pearl / High-Yield Fact**
Burn wound infections are typically categorized as either superficial (involving the epidermis and dermis) or deep (involving the subcutaneous tissue and muscle). Pseudomonas aeruginosa is often associated with deep burn wound infections, which can be more severe and difficult to treat.
**Correct Answer: D. Pseudomonas aeruginosa**