Inter-epidemic Rift Valley fever virus seroconversions in an irrigation scheme in Bura, south-east Kenya
Rift Valley fever (RVF) is an acute mosquito-borne viral zoonosis whose outbreaks are often associated with prolonged rainfall and flooding, during which large numbers of vectors emerge. Recent studies into the inter-epidemic maintenance of RVF virus (RVFV) suggest that both vertical transmission in...
| Main Authors: | , , , , , , , , |
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| Format: | Journal Article |
| Language: | Inglés |
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Hindawi Limited
2018
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10568/82988 |
| _version_ | 1855522685430267904 |
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| author | Mbotha, D. Bett, Bernard K. Kairu-Wanyoike, S.W. Grace, Delia Kihara, Absolomon Wainaina, M. Hoppenheit, A. Clausen, Peter-Henning Lindahl, Johanna F. |
| author_browse | Bett, Bernard K. Clausen, Peter-Henning Grace, Delia Hoppenheit, A. Kairu-Wanyoike, S.W. Kihara, Absolomon Lindahl, Johanna F. Mbotha, D. Wainaina, M. |
| author_facet | Mbotha, D. Bett, Bernard K. Kairu-Wanyoike, S.W. Grace, Delia Kihara, Absolomon Wainaina, M. Hoppenheit, A. Clausen, Peter-Henning Lindahl, Johanna F. |
| author_sort | Mbotha, D. |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | Rift Valley fever (RVF) is an acute mosquito-borne viral zoonosis whose outbreaks are often associated with prolonged rainfall and flooding, during which large numbers of vectors emerge. Recent studies into the inter-epidemic maintenance of RVF virus (RVFV) suggest that both vertical transmission in vectors and direct transmission between hosts act in combination with predisposing factors for persistence of the virus. A comparative longitudinal survey was carried out in Tana River County, Kenya, in irrigated, riverine and pastoral ecosystems from September 2014–June 2015. The objectives were to investigate the possibility of low-level RVFV transmission in these ecosystems during an inter-epidemic period (IEP), examine variations in RVFV seroprevalence in sheep and goats and determine the risk factors for transmission. Three hundred and sixteen small ruminants were selected and tested for immunoglobulin G antibodies against RVFV nucleoprotein using a competitive ELISA during six visits. Data on potential risk factors were also captured. Inter-epidemic RVFV transmission was evidenced by 15 seroconversions within the irrigated and riverine villages. The number of seroconversions was not significantly different (OR = 0.66, CI = 0.19–2.17, p = .59) between irrigated and riverine areas. No seroconversions were detected in the pastoral ecosystem. This study highlights the increased risk of inter-epidemic RVFV transmission posed by irrigation, through provision of necessary environmental conditions that enable vectors access to more breeding grounds, resting places and shade, which favour their breeding and survival. |
| format | Journal Article |
| id | CGSpace82988 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2018 |
| publishDateRange | 2018 |
| publishDateSort | 2018 |
| publisher | Hindawi Limited |
| publisherStr | Hindawi Limited |
| record_format | dspace |
| spelling | CGSpace829882024-08-27T10:35:40Z Inter-epidemic Rift Valley fever virus seroconversions in an irrigation scheme in Bura, south-east Kenya Mbotha, D. Bett, Bernard K. Kairu-Wanyoike, S.W. Grace, Delia Kihara, Absolomon Wainaina, M. Hoppenheit, A. Clausen, Peter-Henning Lindahl, Johanna F. animal diseases irrigation zoonoses Rift Valley fever (RVF) is an acute mosquito-borne viral zoonosis whose outbreaks are often associated with prolonged rainfall and flooding, during which large numbers of vectors emerge. Recent studies into the inter-epidemic maintenance of RVF virus (RVFV) suggest that both vertical transmission in vectors and direct transmission between hosts act in combination with predisposing factors for persistence of the virus. A comparative longitudinal survey was carried out in Tana River County, Kenya, in irrigated, riverine and pastoral ecosystems from September 2014–June 2015. The objectives were to investigate the possibility of low-level RVFV transmission in these ecosystems during an inter-epidemic period (IEP), examine variations in RVFV seroprevalence in sheep and goats and determine the risk factors for transmission. Three hundred and sixteen small ruminants were selected and tested for immunoglobulin G antibodies against RVFV nucleoprotein using a competitive ELISA during six visits. Data on potential risk factors were also captured. Inter-epidemic RVFV transmission was evidenced by 15 seroconversions within the irrigated and riverine villages. The number of seroconversions was not significantly different (OR = 0.66, CI = 0.19–2.17, p = .59) between irrigated and riverine areas. No seroconversions were detected in the pastoral ecosystem. This study highlights the increased risk of inter-epidemic RVFV transmission posed by irrigation, through provision of necessary environmental conditions that enable vectors access to more breeding grounds, resting places and shade, which favour their breeding and survival. 2018-02 2017-08-02T09:34:06Z 2017-08-02T09:34:06Z Journal Article https://hdl.handle.net/10568/82988 en Open Access Hindawi Limited Mbotha, D., Bett, B., Kairu-Wanyoike, S., Grace, D., Kihara, A., Wainaina, M., Hoppenheit, A., Clausen, P.-H. and Lindahl, J. 2018. Inter-epidemic Rift Valley fever virus seroconversions in an irrigation scheme in Bura, south-east Kenya. Transboundary and Emerging Diseases 65(1): e55–e62. |
| spellingShingle | animal diseases irrigation zoonoses Mbotha, D. Bett, Bernard K. Kairu-Wanyoike, S.W. Grace, Delia Kihara, Absolomon Wainaina, M. Hoppenheit, A. Clausen, Peter-Henning Lindahl, Johanna F. Inter-epidemic Rift Valley fever virus seroconversions in an irrigation scheme in Bura, south-east Kenya |
| title | Inter-epidemic Rift Valley fever virus seroconversions in an irrigation scheme in Bura, south-east Kenya |
| title_full | Inter-epidemic Rift Valley fever virus seroconversions in an irrigation scheme in Bura, south-east Kenya |
| title_fullStr | Inter-epidemic Rift Valley fever virus seroconversions in an irrigation scheme in Bura, south-east Kenya |
| title_full_unstemmed | Inter-epidemic Rift Valley fever virus seroconversions in an irrigation scheme in Bura, south-east Kenya |
| title_short | Inter-epidemic Rift Valley fever virus seroconversions in an irrigation scheme in Bura, south-east Kenya |
| title_sort | inter epidemic rift valley fever virus seroconversions in an irrigation scheme in bura south east kenya |
| topic | animal diseases irrigation zoonoses |
| url | https://hdl.handle.net/10568/82988 |
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