**Question:** Transport medium for cholera -

A. Saline
B. Blood
C. Fluid therapy
D. Enteric media

**Core Concept:** Cholera is a watery diarrheal disease caused by the bacterium Vibrio cholerae. The primary mode of transmission is through contaminated water or food, leading to the ingestion of the bacterium.

**Why the Correct Answer is Right:** The correct answer is D, Enteric media, as it refers to the specific type of culture medium used to identify Vibrio cholerae in laboratory settings. Enteric media contain nutrients and substances that promote the growth and isolation of the bacterium. Saline (option A) and blood (option B) are not the primary transport medium for cholera as they do not facilitate the growth and identification of the causative organism. Fluid therapy (option C) is a treatment for dehydration caused by cholera, not a medium for its transport or identification.

**Why Each Wrong Option is Incorrect:**

A. Saline (sodium chloride solution) is not suitable as a transport medium for cholera as it does not support the growth of Vibrio cholerae, which requires specific nutrients for survival and growth. Saline is primarily used to rehydrate patients with cholera-induced dehydration.

B. Blood is not a suitable transport medium for cholera because the bacterium does not grow well in blood due to the presence of inhibitors like hemoglobin and the immune response against foreign microorganisms. Additionally, blood is not specific to cholera and would require additional steps for isolation of the bacterium.

C. Fluid therapy is a treatment for cholera-induced dehydration, not a transport medium for the bacterium. Fluid therapy helps replace lost fluids and electrolytes in the body due to diarrhea and vomiting but does not facilitate the transport of the bacterium.

**Clinical Pearl:** Cholera is primarily transmitted through contaminated water or food, emphasizing the importance of maintaining proper sanitation, hygiene, and food safety measures to prevent cholera outbreaks.

**Correct Answer Explanation:** Enteric media, specifically Luria Bertani (LB) agar, is the appropriate transport medium for cholera due to its composition that promotes the growth of Vibrio cholerae. LB agar consists of nutrients and trace elements required for the growth and isolation of Vibrio cholerae from environmental samples, stool samples, or water samples suspected of containing the bacterium.