echovirus
n.
enteric cytopathic human orphan virus: any of more than 30 types of viruses of the genus Enterovirus. Infection is asymptomatic in 90% of cases; in others, infection may cause a range of conditions, from mild fever and respiratory symptoms to severe, sometimes fatal conditions such as meningitis and encephalitis. Infection occurs most often during the summer and fall in temperate climates and year-round in tropical climates. When first discovered, the viruses were not a part of any known family of infectious agents (hence their labeling as “orphan”).