Name few diseases caused by virus in humans and animals.

Explanation

### Step-by-Step Solution:

1. **Understanding Viruses**: Viruses are microscopic pathogens that are smaller than bacteria. They require a host's cellular machinery to replicate and multiply. Without a host, viruses cannot reproduce.

2. **Diseases in Animals**:
- **Rabies**: This is a viral disease that affects the central nervous system of mammals, including humans. It is typically transmitted through the bite of an infected animal.
- **Blue Tongue**: This is another viral disease that primarily affects livestock, particularly sheep. It is transmitted by biting midges.

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