cercaria of blood Fluke pass into human body through

Options

A. Ingestion of food
B. Drinking of contaminated water
C. Direct penetration through skin
D. Both B and C.

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks how the cercaria of the blood fluke enters the human body. It's important to clarify what cercaria are and their role in the life cycle of blood flukes.

2. **Identifying the Options**: The options provided are:
- A) Ingestion of food
- B) Drinking of contaminated water
- C) Direct penetration through the skin
- D) Both B and C

3. **Analyzing the Life Cycle of Blood Flukes**: Blood flukes, specifically Schistosoma species, have a life cycle that includes a larval stage called cercaria. These cercaria are released into water from infected snails and can infect humans.

4. **Mechanisms of Entry**:
- **Contaminated Water (Option B)**: Humans can become infected by coming into contact with water that contains cercaria. This is a common transmission route.
- **Skin Penetration (Option C)**: Cercaria can directly penetrate the skin of individuals who come into contact with contaminated water, leading to infection.

5. **Evaluating the Options**:
- **Option A (Ingestion of food)**: This is not a method of transmission for blood flukes, so it can be eliminated.
- **Option B (Drinking of contaminated water)**: This is a valid method of transmission.
- **Option C (Direct penetration through the skin)**: This is also a valid method of transmission.
- **Option D (Both B and C)**: Since both B and C are correct, this option is the best choice.

6. **Conclusion**: The correct answer is option D, as cercaria of the blood fluke can enter the human body through both contaminated water and direct skin penetration.

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