Agar media used for Haemophilus influenza ?
**Core Concept**
Haemophilus influenzae requires specific growth factors to grow on agar media. This bacterium is a fastidious organism that needs both NAD+ (Nicotinamide adenine dinucleotide) and Factor V (also known as NAD+ and X, respectively) to thrive.
**Why the Correct Answer is Right**
The correct agar medium for Haemophilus influenzae is Chocolate agar, which is a type of enriched agar that provides NAD+ and Factor V. Chocolate agar is made by heating blood with a small amount of agar, which denatures the hemoglobin in the blood, resulting in a brownish color. This process releases the NAD+ and Factor V, making it available to the bacteria. The growth of Haemophilus influenzae on chocolate agar is a characteristic feature used in clinical microbiology laboratories for its identification.
**Why Each Wrong Option is Incorrect**
* **Option A:** Blood agar - While blood agar does contain some NAD+, it lacks the necessary amount of Factor V required for the growth of Haemophilus influenzae.
* **Option B:** MacConkey agar - This is a selective medium for Gram-negative bacteria, particularly enteric bacteria, and does not provide the necessary growth factors for Haemophilus influenzae.
* **Option D:** Sabouraud agar - This is a type of agar medium used for the cultivation of fungi and does not provide the necessary growth factors for Haemophilus influenzae.
**Clinical Pearl / High-Yield Fact**
It's essential to note that Haemophilus influenzae can be differentiated from other bacteria that require NAD+ and Factor V by its characteristic requirement for both factors. This knowledge is crucial for accurate identification and diagnosis in clinical microbiology.
**Correct Answer:** C. Chocolate agar.