Which of the following is not a bacterial disease ?

Options

A. Enteric fever
B. Jaundice
C. Bull neck disease
D. Lock jaw disease

Answer

To determine which of the following options is not a bacterial disease, we will analyze each option one by one.

### Step-by-Step Solution:

1. **Identify the First Option: Enteric Fever**
- Enteric fever, commonly known as typhoid fever, is caused by the bacterium *Salmonella typhi*. This infection spreads through contaminated food and water.
- **Conclusion**: Enteric fever is a bacterial disease.

2. **Identify the Second Option: Jaundice**
- Jaundice is not caused by bacteria. It occurs due to the accumulation of bilirubin in the blood, which is a waste product. This condition can be caused by various factors, including liver disease, but not by bacterial infection.
- **Conclusion**: Jaundice is not a bacterial disease.

3. **Identify the Third Option: Bullneck Disease**
- Bullneck disease is another name for diphtheria, which is caused by the bacterium *Corynebacterium diphtheriae*. This is a serious bacterial infection.
- **Conclusion**: Bullneck disease is a bacterial disease.

4. **Identify the Fourth Option: Lockjaw Disease**
- Lockjaw, commonly known as tetanus, is caused by the bacterium *Clostridium tetani*. This is also a bacterial disease.
- **Conclusion**: Lockjaw disease is a bacterial disease.

### Final Answer:
After analyzing all the options, the only condition that is not a bacterial disease is **Jaundice** (Option 2).