All the following cause community acquired pneumonia EXCEPT:
**Core Concept**
Community-acquired pneumonia (CAP) is a type of pneumonia caused by pathogens acquired outside the hospital setting. The most common causes of CAP include Streptococcus pneumoniae, Haemophilus influenzae, and Mycoplasma pneumoniae.
**Why the Correct Answer is Right**
The correct answer is likely to be a pathogen that is typically associated with hospital-acquired pneumonia (HAP). HAP is caused by pathogens that are more commonly found in healthcare settings, such as ventilator-associated pneumonia (VAP) caused by Pseudomonas aeruginosa. This is because HAP patients are often immunocompromised and have underlying medical conditions that make them more susceptible to opportunistic infections.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it is a common cause of community-acquired pneumonia. **Option B:** This option is incorrect because it is also a common cause of community-acquired pneumonia. **Option D:** This option is incorrect because while it can cause pneumonia, it is more commonly associated with hospital-acquired pneumonia.
**Clinical Pearl / High-Yield Fact**
It's essential to note that patients with CAP often present with symptoms such as cough, fever, and shortness of breath. However, the presentation can be variable, and some patients may have atypical symptoms, such as headache or fatigue. A thorough history and physical examination, along with laboratory tests, are necessary to diagnose CAP accurately.
**Correct Answer:** D.