Rift Valley fever

TEM micrograph of tissue infected with Rift Valley fever virus
Symptoms| Fever, muscle pains, headaches[1]
Complications| Loss of sight, confusion, bleeding, liver problems[1]
Duration| Up to a week[1]
Causes| Phlebovirus spread by an infected animal or mosquito[1]
Diagnostic method| Finding antibodies or the virus in the blood[1]
Prevention| Vaccinating animals against the disease, decreasing mosquito bites[1]
Treatment| Supportive care[1]
Frequency| Outbreaks in Africa and Arabia[1]

Rift Valley fever (RVF) is a viral disease that can cause mild to severe symptoms.[1] The mild symptoms may include: fever, muscle pains, and headaches which often last for up to a week.[1] The severe symptoms may include: loss of sight beginning three weeks after the infection, infections of the brain causing severe headaches and confusion, and bleeding together with liver problems which may occur within the first few days.[1] Those who have bleeding have a chance of death as high as 50%.[1]

The disease is caused by the RVF virus, which is of the Phlebovirus type.[1] It is spread by either touching infected animal blood, breathing in the air around an infected animal being butchered, drinking raw milk from an infected animal, or the bite of infected mosquitoes.[1] Animals such as cows, sheep, goats, and camels may be affected.[1] In these animals it is spread mostly by mosquitoes.[1] It does not appear that one person can infect another person.[1] The disease is diagnosed by finding antibodies against the virus or the virus itself in the blood.[1]

Prevention of the disease in humans is accomplished by vaccinating animals against the disease.[1] This must be done before an outbreak occurs because if it is done during an outbreak it may worsen the situation.[1] Stopping the movement of animals during an outbreak may also be useful, as may decreasing mosquito numbers and avoiding their bites.[1] There is a human vaccine; however, as of 2010 it is not widely available.[1] There is no specific treatment and medical efforts are supportive.[1]

Outbreaks of the disease have only occurred in Africa and Arabia.[1] Outbreaks usually occur during periods of increased rain which increase the number of mosquitoes.[1] The disease was first reported among livestock in Rift Valley of Kenya in the early 1900s,[2] and the virus was first isolated in 1931.[1]

## Contents

* 1 Signs and symptoms
* 2 Cause
* 2.1 Virology
* 2.2 Transmission
* 3 Pathogenesis
* 4 Diagnosis
* 5 Prevention
* 6 Treatment
* 7 Epidemiology
* 7.1 2006-07 outbreak in Kenya and Somalia
* 7.2 2007 outbreak in Sudan
* 7.3 2010 South Africa outbreak
* 7.4 2016 outbreak in Uganda
* 7.5 2018 outbreak in Kenya
* 7.6 2018–19 outbreak in Mayotte
* 8 Society and culture
* 8.1 Biological weapon
* 9 Research
* 10 See also
* 11 References
* 12 External links

## Signs and symptoms[edit | edit source]

Usually, people have either no symptoms or only a mild illness with fever, headache, muscle pains, and liver abnormalities. In a small percentage of cases, the illness can progress to hemorrhagic fever syndrome, meningoencephalitis (inflammation of the brain and tissues lining the brain[3]), or affect the eye. Individuals who become ill usually experience fever, generalised weakness, back pain, dizziness, and weight loss at the onset of the illness. Typically, people recover within a week after onset. A small percentage of people with the disease die of it.[4][5][6]

Signs of the virus in livestock include vomiting and diarrhoea, respiratory disease, fever, lethargy, anorexia and sudden death in young animals.[7]

## Cause[edit | edit source]

### Virology[edit | edit source]

Rift Valley fever phlebovirus

Virus classification
(unranked):  | Virus
Realm:  | Riboviria
Kingdom:  | Orthornavirae
Phylum:  | Negarnaviricota
Class:  | Ellioviricetes
Order:  | Bunyavirales
Family:  | Phenuiviridae
Genus:  | Phlebovirus
Species:  |

Rift Valley fever phlebovirus

The virus belongs to the Bunyavirales order. This is an order of enveloped negative single stranded RNA viruses. All Bunyaviruses have an outer lipid envelope with two glycoproteins—G(N) and G(C)—required for cell entry. They deliver their genome into the host-cell cytoplasm by fusing their envelope with an endosomal membrane.[8][9][10]

The virus' G(C) protein has a class II membrane fusion protein architecture similar to that found in flaviviruses and alphaviruses.[11]

The virus' 11.5 kb tripartite genome is composed of single-stranded RNA. As a Phlebovirus, it has an ambisense genome. Its L and M segments are negative-sense, but its S segment is ambisense.[12]

These three genome segments code for six major proteins: L protein (viral polymerase), the two glycoproteins G(N) and G(C), the nucleocapsid N protein, and the nonstructural NSs and NSm proteins.[8][9][13]

### Transmission[edit | edit source]

a) Persistent flooding b and c) susceptible livestock d) infected individual with severe meningismus

The virus is transmitted through mosquito vectors, as well as through contact with the tissue of infected animals. Two species—Culex tritaeniorhynchus and Aedes vexans—are known to transmit the virus.[14]

Other potential vectors include Aedes caspius, Aedes mcintosh, Aedes ochraceus, Culex pipiens, Culex antennatus, Culex perexiguus, Culex zombaensis and Culex quinquefasciatus.[15][16][17]

Contact with infected tissue is considered to be the main source of human infections.[18]

The virus has been isolated from two bat species: the Peter's epauletted fruit bat (Micropteropus pusillus) and the aba roundleaf bat (Hipposideros abae), which are believed to be reservoirs for the virus.[19]

## Pathogenesis[edit | edit source]

Although many components of the RVFV's RNA play an important role in the virus’ pathology, the nonstructural protein encoded on the S segment (NSs) is the only component that has been found to directly affect the host. NSs is hostile and combative against the hosts interferon (IFNs) antiviral response.[13] IFNs are essential in order for the immune system to fight off viral infections in a host.[20] This inhibitory mechanism is believed to be due to a number of reasons, the first being, competitive inhibition of the formation of the transcription factor.[13] On this transcription factor, NSs interacts with and binds to a subunit that is needed for RNA polymerase I and II.[13][21] This interaction cause competitive inhibition with another transcription factor component and prevents the assembly process of the transcription factor complex, which results in the suppression of the host antiviral response.[13][21] Transcription suppression is believed to be another mechanism of this inhibitory process.[13] This occurs when an area of NSs interacts with and binds to the host's protein, SAP30 and forms a complex.[13][21] This complex causes histone acetylation to regress, which is needed for transcriptional activation of the IFN promoter.[21] This causes IFN expression to be obstructed. Lastly, NSs has also been known to affect regular activity of double-stranded RNA-dependent protein kinase R.. This protein is involved in cellular antiviral responses in the host. When RVFV is able to enter the hosts DNA, NSs forms a filamentous structure in the nucleus. This allows the virus to interact with specific areas of the hosts DNA that relates to segregation defects and induction of chromosome continuity. This increases host infectivity and decreases the host's antiviral response.[13]

## Diagnosis[edit | edit source]

Diagnosis relies on viral isolation from tissues, or serological testing with an ELISA.[7][22] Other methods of diagnosis include Nucleic Acid Testing (NAT), cell culture, and IgM antibody assays.[23] As of September 2016, the Kenya Medical Research Institute (KEMRI) has developed a product called Immunoline, designed to diagnose the disease in humans much faster than in previous methods.[24]

## Prevention[edit | edit source]

See also: Prevention of viral hemorrhagic fever

A person's chances of becoming infected can be reduced by taking measures to decrease contact with blood, body fluids, or tissues of infected animals and protection against mosquitoes and other bloodsucking insects. Use of mosquito repellents and bed nets are two effective methods. For persons working with animals in RVF-endemic areas, wearing protective equipment to avoid any exposure to blood or tissues of animals that may potentially be infected is an important protective measure.[25] Potentially, establishing environmental monitoring and case surveillance systems may aid in the prediction and control of future RVF outbreaks.[25]

No vaccines are currently available for humans.[25][1] While a vaccines have been developed for humans, it has only been used experimentally for scientific personnel in high-risk environments.[1] Trials of a number of vaccines, such as NDBR-103 and TSI-GSD 200, are ongoing.[26] Different types of vaccines for veterinary use are available. The killed vaccines are not practical in routine animal field vaccination because of the need of multiple injections. Live vaccines require a single injection but are known to cause birth defects and abortions in sheep and induce only low-level protection in cattle. The live-attenuated vaccine, MP-12, has demonstrated promising results in laboratory trials in domesticated animals, but more research is needed before the vaccine can be used in the field. The live-attenuated clone 13 vaccine was recently registered and used in South Africa. Alternative vaccines using molecular recombinant constructs are in development and show promising results.[25]

A vaccine has been conditionally approved for use in animals in the US.[27] It has been shown that knockout of the NSs and NSm nonstructural proteins of this virus produces an effective vaccine in sheep as well.[28]

## Treatment[edit | edit source]

In terms of the management of this condition as it is usually mild/moderate no treatment is needed. In severe cases only supportive care is available.[29]

## Epidemiology[edit | edit source]

Distribution of Rift Valley fever in Africa: Blue, countries with endemic disease and substantial outbreaks of RVF; green, countries known to have some cases, periodic isolation of virus, or serologic evidence of RVF

RVF outbreaks occur across sub-Saharan Africa, with outbreaks occurring elsewhere infrequently. In Egypt in 1977–78, an estimated 200,000 people were infected and there were at least 594 deaths.[30] [31] In Kenya in 1998, the virus killed more than 400 people. In September 2000, an outbreak was confirmed in Saudi Arabia and Yemen. On 19 October 2011, a case of Rift Valley fever contracted in Zimbabwe was reported in a Caucasian female traveler who returned to France after a 26-day stay in Marondera, Mashonaland East Province during July and August, 2011[32] but later classified as "not confirmed."[33]

Outbreaks of this disease usually correspond with the warm phases of the EI Niño/Southern Oscillation. During this time there is an increase in rainfall, flooding and greenness of vegetation index, which leads to an increase in mosquito vectors.[34] RVFV can be transmitted vertically in mosquitos, meaning that the virus can be passed from the mother to her offspring. During dry conditions, the virus can remain viable for a number of years in the egg. Mosquitos lay their eggs in water, where they eventually hatch. As water is essential for mosquito eggs to hatch, rainfall and flooding cause an increase in the mosquito population and an increased potential for the virus.[35]

### 2006-07 outbreak in Kenya and Somalia[edit | edit source]

Main article: 2006–07 East Africa Rift Valley fever outbreak

Marshlands west of Lake Baringo were flooded, contributing to populations of mosquitos that could spread RVF.[36]

In November 2006, a Rift Valley fever outbreak started in Kenya. The cases were from the North Eastern Province and Coast Province of Kenya, which had received heavy rain, causing floods and creating breeding grounds for mosquitoes, which spread the virus of the fever from infected livestock to humans.[29][37]

By 7 January 2007, about 75 people had died and another 183 were infected.[38] The outbreak forced the closure of livestock markets in the North Eastern Province, affecting the economy of the region.[39]The outbreak was subsequently reported to have moved into Maragua and Kirinyaga districts of Central Province of Kenya.[40]On 20 January 2007, the outbreak was reported to have crossed into Somalia from Kenya and killed 14 people in the Lower Jubba region.[41]

In December 2006 and again in January 2007, Taiwan International Health Action (Taiwan IHA) began operating missions in Kenya [42] consisting of medical experts assisting in training laboratory and health facility personnel, and included donations of supplies, such as mosquito sprays. The United States Centers for Disease Control also set up an assistance mission and laboratory in Kenya.By the end of January, 2007, some 148 people had died since the outbreak began in December. The final death toll in this outbreak was more than 150 people.However, on 8 June 2018, the Ministry of Health in Kenya declared another outbreak of RVF.[37][29]

### 2007 outbreak in Sudan[edit | edit source]

In 2007, 125 cases, including 60 deaths, were reported from more than 10 localities of White Nile, Sinnar, and Gezira states in Sudan. Young adult males were predominantly affected. More than 25 human samples have been found positive for RVF by PCR or ELISA.[43]

### 2010 South Africa outbreak[edit | edit source]

The Ministry of Health South Africa reported 87 human cases infected with Rift Valley fever (RVF), including two deaths in Free State, Eastern Cape and Northern Cape provinces.[44]

Most of these cases reported direct contact with RVFV-infected livestock and or were linked to farms with confirmed animal cases of RVF. The human cases were among farmers, veterinarians and farm workers. All cases were confirmed with RVF by test conducted at the National Institute of Communicable Diseases in Johannesburg, South Africa.An outbreak of Rift Valley fever virus infection affected sheep, goats, cattle and wildlife on farms within Free State, Eastern Cape, Northern Cape, Western Cape, Mpumalanga, North West, and Gauteng provinces. As of 29 March 2010, about 78 farms reported laboratory-confirmed animal cases, with extensive livestock deaths.[45][46]

Before the 2010 outbreak, sporadic cases of RVFV infection in animals had been documented in South Africa. The last major outbreak of the disease in humans occurred between 1974 and 1976, where an estimated 10,000 to 20,000 cases were recorded.[45][30][31]

### 2016 outbreak in Uganda[edit | edit source]

In March 2016, a male butcher from Kabale District in western Uganda reported to a local hospital with symptoms of headache, fever, fatigue and bleeding, subsequently testing positive for Rift Valley Fever. CDC sent epidemiologists to the District to assist the Ugandan Ministry of Health with the epidemiologic investigation of this small, localized outbreak of 3 confirmed and 2 probable cases. Working with the Uganda Virus Research Institute (UVRI) and the Uganda Ministry of Health, the CDC team conducted a serologic study in animals and humans and also assessed residents’ knowledge, attitudes, and practices related to Rift Valley Fever. The team collected samples from cows, goats and sheep, and interviewed and tested 650 district residents. A coordinated educational campaign targeting the general population, farmers, herders, and butchers was initiated and informational posters were created targeting these groups.[47]

### 2018 outbreak in Kenya[edit | edit source]

Kenya

An outbreak of Rift Valley fever occurred in northern Kenya, with 26 suspected human cases including 6 deaths in Wajir County (24 cases) and Marsabit County (2 cases); 7 cases have been confirmed. There have also been numerous deaths and abortions in camels, goats and other livestock across a wider area of the country.[48][49][47]

### 2018–19 outbreak in Mayotte[edit | edit source]

An outbreak occurred in the French Mayotte Islands, part of the Comoro group off Mozambique. The first human case showed symptoms on 22 November 2018, and there were a total of 129 confirmed human cases, as well as more than a hundred foci in livestock. The outbreak had led to restrictions on the sale of uncooked milk, as well as the sale and export of cattle and uncooked meat. WHO noted that mosquito transmission should decrease as the rainy season ends in April, although Cyclone Kenneth has been associated with increased rain.[50]

## Society and culture[edit | edit source]

### Biological weapon[edit | edit source]

Rift Valley fever was one of more than a dozen agents that the United States researched as potential biological weapons before the nation suspended its biological weapons program in 1969.[51][52]

## Research[edit | edit source]

The disease is one of several identified by WHO as a likely cause of a future epidemic in a new plan developed after the Ebola epidemic for urgent research and development toward new diagnostic tests, vaccines and medicines.[53][54]

## See also[edit | edit source]

* Coalition for Epidemic Preparedness Innovations

## References[edit | edit source]

1. ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 1.12 1.13 1.14 1.15 1.16 1.17 1.18 1.19 1.20 1.21 1.22 1.23 1.24 1.25 1.26 1.27 "Rift Valley fever". Fact sheet N°207. World Health Organization. May 2010. Archived from the original on 15 April 2014. Retrieved 21 March 2014.
2. ↑ Palmer SR (2011). Oxford textbook of zoonoses : biology, clinical practice, and public health control (2nd ed.). Oxford u.a.: Oxford Univ. Press. p. 423\. ISBN 9780198570028. Archived from the original on 2017-09-08.
3. ↑ "Meningoencephalitis (Concept Id: C0025309) - MedGen - NCBI". www.ncbi.nlm.nih.gov. Archived from the original on 14 March 2022. Retrieved 14 March 2022.
4. ↑ "Signs and Symptoms | Rift Valley Fever | CDC". www.cdc.gov. 25 February 2020. Archived from the original on 14 August 2021. Retrieved 7 March 2022.
5. ↑ Hartman, Amy (2017). "Rift Valley Fever". Clinics in Laboratory Medicine. 37 (2): 285–301. doi:10.1016/j.cll.2017.01.004. ISSN 0272-2712. PMC 5458783. PMID 28457351.
6. ↑ "Orphanet: Rift valley fever". www.orpha.net. Archived from the original on 7 March 2022. Retrieved 10 March 2022.
7. ↑ 7.0 7.1 Rift Valley Fever Archived 2012-05-08 at the Wayback Machine reviewed and published by WikiVet, accessed 12 October 2011.
8. ↑ 8.0 8.1 Wright, Daniel; Kortekaas, Jeroen; Bowden, Thomas A.; Warimwe, George M.YR 2019. "Rift Valley fever: biology and epidemiology". Journal of General Virology. 100 (8): 1187–1199. doi:10.1099/jgv.0.001296. ISSN 1465-2099. Archived from the original on 2 March 2021. Retrieved 9 March 2022.
9. ↑ 9.0 9.1 Bouloy, Michele; Weber, Friedemann (22 April 2010). "Molecular Biology of Rift Valley Fever Virus". The Open Virology Journal. 4: 8–14. doi:10.2174/1874357901004010008. ISSN 1874-3579. Archived from the original on 10 March 2022. Retrieved 10 March 2022.
10. ↑ Herath, Venura; Romay, Gustavo; Urrutia, Cesar D.; Verchot, Jeanmarie (10 September 2020). "Family Level Phylogenies Reveal Relationships of Plant Viruses within the Order Bunyavirales". Viruses. 12 (9): 1010. doi:10.3390/v12091010. ISSN 1999-4915. Archived from the original on 20 March 2022. Retrieved 19 March 2022.
11. ↑ Dessau M, Modis Y (January 2013). "Crystal structure of glycoprotein C from Rift Valley fever virus". Proceedings of the National Academy of Sciences of the United States of America. 110 (5): 1696–701. Bibcode:2013PNAS..110.1696D. doi:10.1073/pnas.1217780110. PMC 3562824. PMID 23319635.
12. ↑ "ViralZone: Phlebovirus". viralzone.expasy.org. Archived from the original on 2016-10-03. Retrieved 2016-09-14.
13. ↑ 13.0 13.1 13.2 13.3 13.4 13.5 13.6 13.7 Boshra H, Lorenzo G, Busquets N, Brun A (July 2011). "Rift valley fever: recent insights into pathogenesis and prevention". Journal of Virology. 85 (13): 6098–105. doi:10.1128/JVI.02641-10. PMC 3126526. PMID 21450816.
14. ↑ Jupp PG, Kemp A, Grobbelaar A, Lema P, Burt FJ, Alahmed AM, Al Mujalli D, Al Khamees M, Swanepoel R (September 2002). "The 2000 epidemic of Rift Valley fever in Saudi Arabia: mosquito vector studies". Medical and Veterinary Entomology. 16 (3): 245–52. doi:10.1046/j.1365-2915.2002.00371.x. PMID 12243225.
15. ↑ Turell MJ, Presley SM, Gad AM, Cope SE, Dohm DJ, Morrill JC, Arthur RR (February 1996). "Vector competence of Egyptian mosquitoes for Rift Valley fever virus". The American Journal of Tropical Medicine and Hygiene. 54 (2): 136–9. doi:10.4269/ajtmh.1996.54.136. PMID 8619436.
16. ↑ Turell MJ, Lee JS, Richardson JH, Sang RC, Kioko EN, Agawo MO, Pecor J, O'Guinn ML (December 2007). "Vector competence of Kenyan Culex zombaensis and Culex quinquefasciatus mosquitoes for Rift Valley fever virus". Journal of the American Mosquito Control Association. 23 (4): 378–82. doi:10.2987/5645.1. PMID 18240513. S2CID 36591701.
17. ↑ Fontenille D, Traore-Lamizana M, Diallo M, Thonnon J, Digoutte JP, Zeller HG (1998). "New vectors of Rift Valley fever in West Africa". Emerging Infectious Diseases. 4 (2): 289–93. doi:10.3201/eid0402.980218. PMC 2640145. PMID 9621201.
18. ↑ Swanepoel R, Coetzer JA (2004). "Rift Valley fever". In Coetzer JA, Tustin RC (eds.). Infectious diseases of livestock (2nd ed.). Cape Town: Oxford University Press Southern Africa. pp. 1037–70. ISBN 978-0195761702.
19. ↑ Boiro I, Konstaninov OK, Numerov AD (1987). "[Isolation of Rift Valley fever virus from bats in the Republic of Guinea]". Bulletin de la Société de Pathologie Exotique et de Ses Filiales (in French). 80 (1): 62–7. PMID 3607999.`{{cite journal}}`: CS1 maint: unrecognized language (link)
20. ↑ Fensterl V, Sen GC (2009-01-01). "Interferons and viral infections". BioFactors. 35 (1): 14–20. doi:10.1002/biof.6. PMID 19319841.
21. ↑ 21.0 21.1 21.2 21.3 Ikegami T, Makino S (May 2011). "The pathogenesis of Rift Valley fever". Viruses. 3 (5): 493–519. doi:10.3390/v3050493. PMC 3111045. PMID 21666766.
22. ↑ "Diagnosis | Rift Valley Fever | CDC". www.cdc.gov. 25 February 2020. Archived from the original on 7 March 2022. Retrieved 11 March 2022.
23. ↑ Fields, Bernard N; Knipe, David M; Howley, Peter M (2013). Fields Virology, 6th Edition. Philadelphia, PA, USA: Wolters Kluwer, Lippincott Williams & Wilkins. p. 441\. ISBN 978-1-4511-0563-6.
24. ↑ "Kemri develops kit for rapid test of viral disease". Archived from the original on 2016-09-06. Retrieved 2016-09-14.
25. ↑ 25.0 25.1 25.2 25.3 "Prevention: Rift Valley Fever | CDC". US Centers for Disease Control and Prevention. Archived from the original on 23 September 2018. Retrieved 24 September 2018. This article incorporates text from this source, which is in the public domain.
26. ↑ Fawzy M, Helmy YA (February 2019). "The One Health Approach is Necessary for the Control of Rift Valley Fever Infections in Egypt: A Comprehensive Review". Viruses. 11 (2): 139. doi:10.3390/v11020139. PMC 6410127. PMID 30736362.
27. ↑ Ikegami T, Hill TE, Smith JK, Zhang L, Juelich TL, Gong B, Slack OA, Ly HJ, Lokugamage N, Freiberg AN (July 2015). "Rift Valley Fever Virus MP-12 Vaccine Is Fully Attenuated by a Combination of Partial Attenuations in the S, M, and L Segments". Journal of Virology. 89 (14): 7262–76. doi:10.1128/JVI.00135-15. PMC 4473576. PMID 25948740.
28. ↑ Bird BH, Maartens LH, Campbell S, Erasmus BJ, Erickson BR, Dodd KA, Spiropoulou CF, Cannon D, Drew CP, Knust B, McElroy AK, Khristova ML, Albariño CG, Nichol ST (December 2011). "Rift Valley fever virus vaccine lacking the NSs and NSm genes is safe, nonteratogenic, and confers protection from viremia, pyrexia, and abortion following challenge in adult and pregnant sheep". Journal of Virology. 85 (24): 12901–9. doi:10.1128/JVI.06046-11. PMC 3233145. PMID 21976656.
29. ↑ 29.0 29.1 29.2 "Rift Valley fever". www.who.int. Archived from the original on 9 October 2021. Retrieved 7 March 2022.
30. ↑ 30.0 30.1 Arzt J, White WR, Thomsen BV, Brown CC (January 2010). "Agricultural diseases on the move early in the third millennium". Veterinary Pathology. 47 (1): 15–27. doi:10.1177/0300985809354350. PMID 20080480. S2CID 31753926.
31. ↑ 31.0 31.1 Bird BH, Ksiazek TG, Nichol ST, Maclachlan NJ (April 2009). "Rift Valley fever virus". Journal of the American Veterinary Medical Association. 234 (7): 883–93. doi:10.2460/javma.234.7.883. PMID 19335238. S2CID 16239209.
32. ↑ Vesin G (19 October 2011). "Rift Valley Fever, human—France: ex Zimbabwe (Mashonaland East) first report". ProMED mail. International Society for Infectious Diseases. 20111020.3132. Archived from the original on 18 January 2015.
33. ↑ Grandadam M, Malvy D (29 November 2011). "Rift Valley Fever, human—France: ex Zimbabwe (Mashonaland East) not". ProMED mail. International Society for Infectious Diseases. 20111129.3486. Archived from the original on 18 January 2015.
34. ↑ Nanyingi MO, Munyua P, Kiama SG, Muchemi GM, Thumbi SM, Bitek AO, Bett B, Muriithi RM, Njenga MK (2015-07-31). "A systematic review of Rift Valley Fever epidemiology 1931-2014". Infection Ecology & Epidemiology. 5: 28024. doi:10.3402/iee.v5.28024. PMC 4522434. PMID 26234531. Archived from the original on 2016-12-02.
35. ↑ "Rift Valley Fever | CDC". www.cdc.gov. Archived from the original on 2016-12-04. Retrieved 2016-12-01.
36. ↑ Sang, Rosemary (2010). "Rift Valley Fever Virus Epidemic in Kenya, 2006/2007: The Entomologic Investigations" (PDF). The American Society of Tropical Medicine and Hygiene. 83 (2 Suppl): 29. doi:10.4269/ajtmh.2010.09-0319. PMC 2913497. PMID 20682903.
37. ↑ 37.0 37.1 Breiman, Robert F; Njenga, M Kariuki; Cleaveland, Sarah; Sharif, Sk; Mbabu, Murithi; King, Lonnie (September 2008). "Lessons from the 2006–2007 Rift Valley fever outbreak in East Africa: implications for prevention of emerging infectious diseases". Future Virology. 3 (5): 411–417. doi:10.2217/17460794.3.5.411. Archived from the original on 8 March 2022. Retrieved 8 March 2022.
38. ↑ "At least 75 people die of Rift Valley Fever in Kenya". International Herald Tribune. 7 January 2007. Archived from the original on 9 January 2007.
39. ↑ "Kenya: Schools Disrupted As Deadly Fever Hits Incomes". IRIN. 11 January 2007. Archived from the original on 6 May 2009. Retrieved 12 January 2007.
40. ↑ "Nairobi at risk of RVF infection". The Standard (Kenya). 22 January 2007. Archived from the original on October 7, 2007.
41. ↑ "14 die after Rift Valley Fever breaks out in southern Somalia". Shabelle Media Network, Somalia. 20 January 2007. Archived from the original on 2007-09-30.
42. ↑ Issue Archived 2007-09-30 at the Wayback Machine. Mofa.gov.tw (2012-04-02). Retrieved on 2014-05-12.
43. ↑ "Deadly fever spreads Kenya Panic". BBC. 26 January 2007. Archived from the original on 1 May 2008.
44. ↑ ProMED-mail Archived 2011-07-28 at the Wayback Machine. ProMED-mail. Retrieved on 2014-05-12.
45. ↑ 45.0 45.1 "Rift Valley fever in South Africa". WHO. Archived from the original on 2010-04-12.
46. ↑ Perez, Andres M.; Medanic, Roberto Carrasco; Thurmond, Mark C. (19 June 2010). "Rift Valley fever outbreaks in South Africa". The Veterinary Record. 166 (25): 798. doi:10.1136/vr.c3062. ISSN 2042-7670. Archived from the original on 13 March 2022. Retrieved 13 March 2022.
47. ↑ 47.0 47.1 "Outbreak Summaries | Rift Valley Fever | CDC". www.cdc.gov. 1 June 2020. Archived from the original on 24 September 2018. Retrieved 16 March 2022.
48. ↑ "Rift Valley fever – Kenya: Disease Outbreak News, 18 June 2018 - Kenya". ReliefWeb. Archived from the original on 18 June 2018. Retrieved 11 March 2022.
49. ↑ "Rift Valley fever – Kenya". www.who.int. Archived from the original on 6 December 2021. Retrieved 12 March 2022.
50. ↑ "Rift Valley Fever – Mayotte (France)". WHO. 13 May 2019. Archived from the original on 1 July 2019. Retrieved 15 May 2019.
51. ↑ "Chemical and Biological Weapons: Possession and Programs Past and Present", James Martin Center for Nonproliferation Studies, Middlebury College, April 9, 2002, accessed November 14, 2008.
52. ↑ "Select Agents and Toxins" (PDF). USDA-APHIS and CDC: National Select Agent Registry. 2011-09-19. Archived from the original (PDF) on 2012-02-25.
53. ↑ Kieny, Marie-Paule. "After Ebola, a Blueprint Emerges to Jump-Start R&D". Scientific American Blog Network. Archived from the original on 20 December 2016. Retrieved 13 December 2016.
54. ↑ "LIST OF PATHOGENS". World Health Organization. Archived from the original on 20 December 2016. Retrieved 13 December 2016.

## External links[edit | edit source]

* CDC RVF Information Page Archived 2016-12-04 at the Wayback Machine
* Rift Valley Fever disease card at OIE Archived 2014-06-29 at the Wayback Machine
* "Rift Valley fever". Fact sheet N°207. World Health Organization. May 2010. Archived from the original on 15 April 2014. Retrieved 21 March 2014.
* "Rift Valley fever virus". NCBI Taxonomy Browser. 11588. Archived from the original on 2018-09-23. Retrieved 2017-09-10.

Classification|

* ICD-10: A92.4
* ICD-9-CM: 066.3
* MeSH: D012295
* DiseasesDB: 31094

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External resources|

* Orphanet: 319251

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* WNV

* Viral hemorrhagic fevers: Dengue fever
* DENV-1-4
* Yellow fever
* YFV
* Zika fever
* Zika virus

Togaviridae|

* Arbovirus encephalitides: Eastern equine encephalomyelitis
* EEEV
* Western equine encephalomyelitis
* WEEV
* Venezuelan equine encephalomyelitis
* VEEV
* Chikungunya
* CHIKV
* O'nyong'nyong fever
* ONNV
* Pogosta disease
* Sindbis virus
* Ross River fever
* RRV
* Semliki Forest virus

Reoviridae|

* Banna virus encephalitis

Tick
-borne|

| Bunyavirales|

* Viral hemorrhagic fevers: Bhanja virus
* Crimean–Congo hemorrhagic fever (CCHFV)
* Heartland virus
* Severe fever with thrombocytopenia syndrome (Huaiyangshan banyangvirus)
* Tete virus

|

Flaviviridae|

* Arbovirus encephalitides: Tick-borne encephalitis
* TBEV
* Powassan encephalitis
* POWV
* Viral hemorrhagic fevers: Omsk hemorrhagic fever
* OHFV
* Kyasanur Forest disease
* KFDV
* AHFV
* Langat virus
* LGTV

Orthomyxoviridae|

* Bourbon virus

Reoviridae|

* Colorado tick fever
* CTFV
* Kemerovo tickborne viral fever

Sandfly
-borne|

| Bunyavirales|

* Adria virus (ADRV)
* Oropouche fever
* Oropouche virus
* Pappataci fever
* Toscana virus
* Sandfly fever Naples virus

|

Rhabdoviridae|

* Chandipura virus

Mammal
-borne|

| Rodent
-borne|

| Arenaviridae|

* Viral hemorrhagic fevers: Lassa fever
* LASV
* Venezuelan hemorrhagic fever
* GTOV
* Argentine hemorrhagic fever
* JUNV
* Brazilian hemorrhagic fever
* SABV
* Bolivian hemorrhagic fever
* MACV
* LUJV
* CHPV

|

Bunyavirales|

* Hemorrhagic fever with renal syndrome
* DOBV
* HTNV
* PUUV
* SEOV
* AMRV
* THAIV
* Hantavirus pulmonary syndrome
* ANDV
* SNV

Herpesviridae|

* Murid gammaherpesvirus 4

Bat
-borne|

| Filoviridae|

* BDBV
* SUDV
* TAFV
* Marburg virus disease
* MARV
* RAVV

|

Rhabdoviridae|

* Rabies
* ABLV
* MOKV
* DUVV
* LBV
* CHPV

Paramyxoviridae|

* Henipavirus encephalitis
* HeV
* NiV

Coronaviridae|

* MERS-CoV
* SARS-related coronavirus
* SARS-CoV
* SARS-CoV-2

Primate
-borne|

| Herpesviridae|

* B virus

|

Retroviridae|

* Simian foamy virus
* HTLV-1
* HTLV-2

Poxviridae|

* Tanapox
* Yaba monkey tumor virus

Multiple
vectors|

| Rhabdoviridae|

* Rabies
* RABV
* Mokola virus

|

Poxviridae|

* Monkeypox

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