Microviridae is a family of bacteriophages with a single-stranded DNA genome. The name of this family is derived from the Greek micro, meaning small. This refers to the size of their genomes, which are among the smallest of the DNA viruses. Enterobacteria, intracellular parasitic bacteria, and spiroplasma serve as natural hosts. There are currently 12 species in this family, divided among 7 genera and one subfamily.