O'nyong'nyong virus
| O’nyong’nyong virus | |
|---|---|
| Virus classification | |
| Group: |
Group IV ((+)ssRNA)
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| Family: | |
| Genus: | |
| Species: |
O’nyong’nyong virus
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| O'nyong'nyong virus | |
|---|---|
| Classification and external resources | |
| Specialty | Lua error in Module:Wikidata at line 446: attempt to index field 'wikibase' (a nil value). |
| ICD-10 | A92.1 |
| ICD-9-CM | 066.3 |
| Patient UK | O'nyong'nyong virus |
The o'nyong'nyong virus or o'nyong-nyong virus (ONNV) is a virus[1] first isolated by the Uganda Virus Research Institute in Entebbe, Uganda in 1959. It is a togavirus (family Togaviridae), genus Alphavirus and is closely related to the chikungunya and Igbo Ora viruses. 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.
Transmission
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).
Presentation
Common symptoms of infection with the virus are polyarthritis, rash and fever. Other symptoms include eye pain, chest pain, lymphadenitis and lethargy. No fatalities due to infection are known.
Epidemics
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. This was one of the largest arbovirus epidemics recorded. The first virus isolates were obtained during this outbreak from mosquitoes and human blood samples collected from Gulu in northern Uganda in 1959.
The second epidemic in 1996–1997 affected 400 people and was confined to Uganda. The 35-year hiatus between the two outbreaks and evidence of an outbreak in 1904–1906 in Uganda indicate a 30–50 year cycle for epidemics.
In 2015–2016 there was a minor outbreak in Uganda with 51 suspected cases.[2]
Strains
ONNV has at least three major subtypes, or strains, the genomic sequences of which are currently available on genome databases.
Cycle
It can involve a future or sylvatic cycle.[3]
References
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- ↑ http://www.who.int/csr/don/19-may-2016-hf-south-sudan/en/
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