Electron micrograph depicts a number of parvovirus H-1 virions of the Parvoviridae family of DNA viruses. Parvovirus, sometimes truncated to "parvo", is both the common name in English casually applied to all the viruses in the Parvoviridae taxonomic family and also the taxonomic name of the Parvovirus genus within the Parvoviridae family. This creates a confusion of terms, because parvoviruses which causes human and animal diseases are not in the genus Parvovirus, though they are casually called parvoviruses. Parvoviruses are typically linear, non-segmented single-stranded DNA viruses, with an average genome size of 5000 nucleotides, which are some of the smallest viruses. No members of the genus Parvovirus are currently known to infect humans, but humans can be infected by viruses within three other genera from the family Parvoviridae, including the one popularly known by the common name Parvovirus B19. These are the Dependoviruses (Adeno-Associated Virus), the Erythroviruses (Parvovirus B19) and the Bocaviruses.