O'nyong'nyong

O’nyong’nyong virus
Virus classification
Group:	Group IV ((+)ssRNA)
Family:	Togaviridae
Genus:	Alphavirus
Species:	O’nyong’nyong virus

O'nyong'nyong virus
Classification and external resources
ICD-10	A92.1
ICD-9-CM	066.3
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The o'nyong'nyong virus (ONNV) was first isolated by researchers at the Uganda Virus Research Institute in Entebbe, Uganda, during a large outbreak of a disease in 1959 that resembled dengue fever. ONNV is a togavirus (family Togaviridae), genus Alphavirus, is closely related to the chikungunya and Igbo Ora viruses, and is a member of the Semliki Forest antigenic complex. The name was given to the disease by the Acholi tribe during the 1959 outbreak. The name comes from the Nilotic language of Uganda and Sudan and means “weakening of the joints". The virus can infect humans and may cause disease.

ONNV is transmitted by bites from an infected mosquito. It is the only virus whose primary vectors are anopheline mosquitoes (Anopheles funestus and Anopheles gambiae).

Common symptoms of infection with the virus are polyarthritis, rash and fever. Other symptoms include eye pain, chest pain, lymphadenitis and lethargy. The disease is self-limiting. No fatalities due to infection are known.

There have been two epidemics of o’nyong’nyong fever. The first occurred from 1959 to 1962, spreading from Uganda to Kenya, Tanzania, Zaire (Democratic Republic of the Congo), Malawi and Mozambique, and affecting over two million people, one of the largest arbovirus epidemics ever recorded. The first virus isolates were obtained during this outbreak from mosquitoes and human blood samples collected from Gulu in northern Uganda in 1959.

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