A virus that infects bacteria and destroys them is called as

A virus that infects bacteria and destroys them is called Bacteriophase.
A bacteriophage, also known informally as a phage is a duplodnaviria virus that infects and replicates within bacteria and archaea. The term was derived from "bacteria" and the, meaning "to devour".
A bacteriophage is a type of virus that infects bacteria. The word "bacteriophage" literally means "bacteria eater," because bacteriophages destroy their host cells. All bacteriophages are composed of a nucleic acid molecule that is surrounded by a protein structure.