A bacteriophage is a type of virus that infects bacteria. Bacteriophage are likely the most numerous "organisms" on Earth [1][2]

Notes and References

1.^ Wommack KE & Colwell RR. 2000. Virioplankton: viruses in aquatic ecosystems. Microbiol. Mol. Biol. Rev. 64:69.

2.^ Hendrix RW. 2002. Bacteriophages: Evolution of the majority. Theor. Pop. Biol. 61: 471-480.

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