What are viruses parasitising bacteria called ? Etc.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the specific name of viruses that infect bacteria.

2. **Definition of Viruses**: Viruses are microscopic infectious agents that require a host cell to replicate. They consist of genetic material (either DNA or RNA) surrounded by a protein coat called a capsid.

3. **Types of Viruses**: Viruses can infect various types of organisms, including animals, plants, and bacteria.

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