Effects of irrigation and rainfall on the population dynamics of Rift Valley fever and other arbovirus mosquito vectors in the epidemic-prone Tana River County, Kenya

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cg.authorship.typesCGIAR and developing country instituteen_US
cg.contributor.affiliationKenya Medical Research Instituteen_US
cg.contributor.affiliationInternational Livestock Research Instituteen_US
cg.contributor.affiliationUniversity of Nairobien_US
cg.contributor.crpAgriculture for Nutrition and Healthen_US
cg.contributor.donorDepartment for International Development, United Kingdomen_US
cg.contributor.donorEconomic and Social Research Council, United Kingdomen_US
cg.contributor.donorNatural Environment Research Council, United Kingdomen_US
cg.coverage.countryKenyaen_US
cg.coverage.iso3166-alpha2KEen_US
cg.coverage.regionAfricaen_US
cg.coverage.regionEastern Africaen_US
cg.creator.identifierJohanna Lindahl: 0000-0002-1175-0398en_US
cg.creator.identifierDelia Grace: 0000-0002-0195-9489en_US
cg.creator.identifierMohammed Yahya Said: 0000-0001-8127-6399en_US
cg.creator.identifierBernard Bett: 0000-0001-9376-2941en_US
cg.howPublishedFormally Publisheden_US
cg.identifier.doihttps://doi.org/10.1093/jme/tjw206en_US
cg.isijournalISI Journalen_US
cg.issn0022-2585en_US
cg.issue2en_US
cg.journalJournal of Medical Entomologyen_US
cg.reviewStatusPeer Reviewen_US
cg.subject.ilriAGRI-HEALTHen_US
cg.subject.ilriANIMAL DISEASESen_US
cg.subject.ilriENVIRONMENTen_US
cg.subject.ilriIRRIGATIONen_US
cg.subject.ilriRVFen_US
cg.subject.ilriZOONOTIC DISEASESen_US
cg.volume54en_US
dc.contributor.authorSang, R.en_US
dc.contributor.authorLutomiah, J.en_US
dc.contributor.authorSaid, Mohammed Yahyaen_US
dc.contributor.authorMakio, A.en_US
dc.contributor.authorKoka, H.en_US
dc.contributor.authorKoskei, E.en_US
dc.contributor.authorNyunja, A.en_US
dc.contributor.authorOwaka, S.en_US
dc.contributor.authorMatoke-Muhia, D.en_US
dc.contributor.authorBukachi, S.en_US
dc.contributor.authorLindahl, Johanna F.en_US
dc.contributor.authorGrace, Deliaen_US
dc.contributor.authorBett, Bernard K.en_US
dc.date.accessioned2017-01-10T08:07:01Zen_US
dc.date.available2017-01-10T08:07:01Zen_US
dc.identifier.urihttps://hdl.handle.net/10568/78635en_US
dc.titleEffects of irrigation and rainfall on the population dynamics of Rift Valley fever and other arbovirus mosquito vectors in the epidemic-prone Tana River County, Kenyaen_US
dcterms.abstractRift Valley fever (RVF) is a mosquito-borne viral zoonosis that is found in most regions of sub-Saharan Africa, and it affects humans, livestock, and some wild ungulates. Outbreaks are precipitated by an abundance of mosquito vectors associated with heavy persistent rainfall with flooding. We determined the impact of flood-irrigation farming and the effect of environmental parameters on the ecology and densities of primary and secondary vectors of the RVF virus (RVFV) in an RVF-epidemic hotspot in the Tana River Basin, Kenya. Mosquito sampling was conducted in farms and villages (settlements) in an irrigated and a neighboring nonirrigated site (Murukani). Overall, a significantly higher number of mosquitoes were collected in farms in the irrigation scheme compared with villages in the same area (P < 0.001), or farms (P < 0.001), and villages (P = 0.03) in Murukani. In particular, key primary vectors of RVFV, Aedes mcintoshi Marks and Aedes ochraceous Theobald, were more prevalent in the farms compared with villages in the irrigation scheme (P = 0.001) both during the dry and the wet seasons. Similarly, there was a greater abundance of secondary vectors, particularly Culex univittatus Theobald and Culex pipiens (L.) in the irrigation scheme than in the Murukani area. Rainfall and humidity were positively correlated with mosquito densities, particularly the primary vectors. Adult floodwater mosquitoes and Mansonia spp. were collected indoors; immatures of Ae. mcintoshi and secondary vectors were collected in the irrigation drainage canals, whereas those of Ae. ochraceous and Aedes sudanensis Theobald were missing from these water bodies. In conclusion, irrigation in RVF endemic areas provides conducive resting and breeding conditions for vectors of RVFV and other endemic arboviruses.en_US
dcterms.accessRightsOpen Accessen_US
dcterms.audienceScientistsen_US
dcterms.available2016-12-22en_US
dcterms.bibliographicCitationSang, R., Lutomiah, J., Said, M., Makio, A., Koka, H., Koskei, E., Nyunja, A., Owaka, S., Matoke-Muhia, D., Bukachi, S., Lindahl, J., Grace, D. and Bett, B. 2017. Effects of irrigation and rainfall on the population dynamics of Rift Valley fever and other arbovirus mosquito vectors in the epidemic-prone Tana River County, Kenya. Journal of Medical Entomology 54(2): 460–470.en_US
dcterms.extentp. 460-470en_US
dcterms.issued2017-03en_US
dcterms.languageenen_US
dcterms.licenseCC-BY-NC-4.0en_US
dcterms.publisherOxford University Pressen_US
dcterms.subjectanimal diseasesen_US
dcterms.subjectzoonosesen_US
dcterms.typeJournal Articleen_US

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