Cholera transmission by –
**Core Concept**
Cholera is an infectious disease caused by the bacterium Vibrio cholerae, which primarily affects the small intestine. The transmission of cholera is a critical public health issue, and understanding its mode of transmission is essential for prevention and control.
**Why the Correct Answer is Right**
Cholera is transmitted through the fecal-oral route, where the bacteria are ingested through contaminated food or water. The bacteria multiply in the small intestine, producing a toxin that causes severe diarrhea and dehydration. This mode of transmission is facilitated by the presence of a contaminated water source or an infected person who does not practice proper hygiene. The Vibrio cholerae bacteria can also be spread through contaminated seafood, particularly shellfish.
**Why Each Wrong Option is Incorrect**
**Option A:** Cholera transmission is not primarily through respiratory droplets, as is the case with influenza.
**Option B:** While cholera can be spread through person-to-person contact, it is not the primary mode of transmission.
**Option C:** Cholera transmission is not typically associated with vectors like mosquitoes or ticks.
**Clinical Pearl / High-Yield Fact**
Cholera outbreaks often occur in areas with poor sanitation and hygiene, highlighting the importance of access to clean water and proper waste disposal in preventing the spread of this disease.
**Correct Answer: D. Fecal-oral route.**