Which one of the following is a viral diseasse of poultry?

Options

A. Bird flu
B. Swine flu
C. Fowl Cholera
D. Spirochaetosis

Answer

To determine which of the following is a viral disease of poultry, we will analyze each option provided.

### Step-by-Step Solution:

1. **Understand the Question**: We need to identify a viral disease that specifically affects poultry (birds).

2. **Evaluate the Options**:
- **Option 1: Bird Flu**: This is known to be caused by the H5N1 virus, which is indeed a viral disease affecting birds, particularly poultry.
- **Option 2: Swine Flu**: This disease is caused by the pig influenza virus and primarily affects pigs, not poultry. Therefore, this option is not relevant to our question.
- **Option 3: Fowl Cholera**: This disease is caused by the bacterium Pasteurella multocida, making it a bacterial disease, not viral. Thus, this option can be eliminated.
- **Option 4: Spirochaetosis**: This condition is also caused by bacteria (specifically spirochetes), so it is not a viral disease and can be eliminated as well.

3. **Identify the Correct Answer**: After evaluating all options, we find that the only viral disease affecting poultry is Bird Flu (H5N1 virus).

### Conclusion:
The correct answer to the question "Which one of the following is a viral disease of poultry?" is **Option 1: Bird Flu**.