Bacteriophages occur abundantly in the biosphere, with different virions, genomes, and lifestyles. Phages are classified by the International Committee on Taxonomy of Viruses (ICTV) according to morphology and nucleic acid. Nineteen families are currently recognized by the ICTV that infect bacteria and archaea . Of these, only two families have RNA genomes, and only five families are enveloped. Of the viral families with DNA genomes, only two have single-stranded genomes. Eight of the viral families with DNA genomes have circular genomes while nine have linear genomes. Nine families infect bacteria only, nine infect archaea only, and one ( Tectiviridae ) infects both bacteria and archaea.
The structure of a typical myovirus bacteriophage Anatomy and infection cycle of phage T4 A bacteriophage ( / b æ k ˈ t ɪər i oʊ f eɪ dʒ / ), also known informally as a phage ( / f eɪ dʒ / ), is a virus that infects and replicates within Bacteria and Archaea . The term was derived from "bacteria" and the Greek φαγεῖν ( phagein ), "to devour". Bacteriophages are composed of proteins that encapsulate a DNA or RNA genome , and may have relatively simple or elaborate structures. Their genomes may encode as few as four genes and as many as hundreds of genes . Phages replicate within the bacterium following the injection of their genome into its cytoplasm . Bacteriophages are among the most common and diverse entities in the biosphere . [1] Bacteriophages are ubiquitous viruses, found wherever bacteria exist. It is estimated th...