Community acquired pneumonia in person rearing sheep ?
**Core Concept**
Community-acquired pneumonia (CAP) in individuals exposed to certain occupational or environmental risks requires consideration of specific pathogens. In this scenario, the patient's occupation as a sheep breeder or shepherd increases the likelihood of exposure to zoonotic pathogens, such as those transmitted from animals to humans.
**Why the Correct Answer is Right**
The patient's occupational exposure to sheep may increase the risk of contracting *Pasteurella multocida*, a bacterium commonly found in the respiratory tract of sheep and other animals. This bacterium can cause a form of CAP, particularly in individuals with underlying lung disease or immunocompromised states. **Option C** is correct because *P. multocida* is a well-documented cause of CAP in sheep handlers.
**Why Each Wrong Option is Incorrect**
* **Option A:** *Streptococcus pneumoniae* is a common cause of CAP, but it is not specifically linked to sheep exposure. While it's a possibility, it's not the best answer given the patient's occupation.
* **Option B:** *Legionella pneumophila* is another cause of CAP, but it is typically associated with water exposure or contaminated air conditioning systems, not sheep.
**Clinical Pearl / High-Yield Fact**
When evaluating CAP in individuals with occupational exposure to animals, consider zoonotic pathogens like *Pasteurella multocida*. Remember that the patient's occupation can provide critical clues to the underlying cause of their illness.
**Correct Answer:** C. *Pasteurella multocida*.