A girl from shimla presented to OPD with fever, hypotension, malaise and axillary and inguinal lymphadenopathy. Culture in glucose broth shows stalactite growth. Most likely causative organism is –
## **Core Concept**
The question describes a clinical presentation suggestive of a systemic infection with lymphadenopathy. The key laboratory finding is the "stalactite growth" in glucose broth, which is characteristic of a specific type of bacterial growth pattern.
## **Why the Correct Answer is Right**
The description of "stalactite growth" in glucose broth is highly suggestive of *Francisella tularensis*, the causative organism of tularemia. Tularemia is a zoonotic infection that can present with fever, malaise, and lymphadenopathy, among other symptoms. The stalactite or "icicle-like" growth pattern is a classic laboratory feature of *Francisella tularensis* in glucose broth. This organism is known to cause infections through contact with infected animals or contaminated water, which could be relevant given the patient's location in Shimla, a region with abundant wildlife and water bodies.
## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is incorrect because it does not match the description provided for the organism's growth pattern or the clinical presentation.
- **Option B:** This option is incorrect as it does not align with the specific laboratory finding of stalactite growth or the typical clinical manifestations described.
- **Option D:** This option is incorrect because it does not correspond with the characteristic stalactite growth in glucose broth or the clinical picture of tularemia.
## **Clinical Pearl / High-Yield Fact**
A key point to remember is that tularemia, caused by *Francisella tularensis*, can present with a range of symptoms including fever, lymphadenopathy, and can be acquired through skin contact with infected animals or contaminated water. The unique growth pattern in glucose broth is a critical diagnostic clue.
## **Correct Answer:** .