O'nyong'nyong virus

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O'nyong'nyong virus
Infectious disease

The o'nyong'nyong virus (ONNV) was first isolated by researchers at the

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.[2] The name was given to the disease by the Acholi tribe during the 1959 outbreak.[3] 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.[4]

Signs and symptoms

Common symptoms of infection with the virus are

lymphadenitis and lethargy. The disease is self-limiting.[5]
No fatalities due to infection are known.

Cause

O'nyong'nyong virus
Virus classification Edit this classification
(unranked): Virus
Realm: Riboviria
Kingdom: Orthornavirae
Phylum: Kitrinoviricota
Class: Alsuviricetes
Order: Martellivirales
Family: Togaviridae
Genus: Alphavirus
Species:
O'nyong'nyong virus

Strains

ONNV has at least three major subtypes, or strains, the genomic sequences of which are currently available on genome databases.

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)[citation needed].

Epidemiology

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.[6][7] The first virus isolates were obtained during this outbreak from mosquitoes and human blood samples collected from Gulu in northern Uganda in 1959.[8]

The second epidemic in 1996–1997 was confined to Uganda.[9] 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.[10]

In 2013, ONNV was confirmed as the cause of disease in a 60-year-old German woman who became infected while traveling in East Africa.[11] In 2015–2016 there was a minor outbreak in Uganda with 51 suspected cases.[citation needed]

There has been a minor outbreak in Mombasa (Kenya) and the County Government of Mombasa issued a warning. [12]

A 2015 study indicated that ONNV is endemic in coastal East Africa, along with chikungunya virus.[13]

References

  1. PMID 14297194
    .
  2. PMID 10644846
    .
  3. doi:10.1016/0035-9203(60)90025-0
    .
  4. PMID 16014827
    .
  5. doi:10.1016/0035-9203(60)90025-0
    .
  6. PMID 10432073
    .
  7. PMID 13785469
    .
  8. PMID 13785469
    .
  9. PMID 10515801
    .
  10. PMID 9126450
    .
  11. PMID 25271361
    .
  12. ^ "Panic in Mombasa over mysterious O'nyong' Nyong disease". 5 July 2020.
  13. PMID 25658762
    .

External links

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