Which spreads the cysts of Entamoeba histolytica ?

Options

A. Mosquito
B. Bedbug
C. Mouse
D. House fly

Answer

**Step-by-Step Solution:**

1. **Understanding Entamoeba histolytica**:
- Entamoeba histolytica is an anaerobic protozoan parasite that causes diseases such as amoebic dysentery.
- The disease is characterized by symptoms like diarrhea, mucus and blood in stools, nausea, and vomiting.

2. **Infection Process**:
- The infection occurs primarily through the ingestion of the cystic form of the parasite, which is the infectious stage.
- Cysts can be found in contaminated soil, water, and are also excreted in the feces of infected humans.

3. **Role of Vectors**:
- The cysts can be spread by vectors that come into contact with contaminated materials.
- In this context, houseflies are significant vectors because they can carry the cysts from contaminated sources to food or surfaces that humans may touch.

4. **Identifying the Correct Answer**:
- The question asks which organism spreads the cysts of Entamoeba histolytica.
- The options provided are mosquito, bat bug, mouse, and housefly.
- Based on the information, houseflies are known to spread the cysts by contaminating food or surfaces.

5. **Final Conclusion**:
- Therefore, the correct answer is **D) Housefly**. Houseflies are responsible for spreading the cysts of Entamoeba histolytica, leading to potential infection in humans.

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