Name some viral diseases.

Explanation

### Step-by-Step Solution:

1. **Understanding Viral Diseases**:
- Viral diseases are illnesses caused by viruses, which are microscopic infectious agents that can only replicate inside the living cells of an organism.

2. **Listing Viral Diseases**:
- Start by naming some common viral diseases. Here are a few examples:
- **Mosaic Disease**: Caused by the Tobacco Mosaic Virus (TMV).
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