The RVF virus (RVFV) is a member of the Phlebovirus genus ( Bunyaviridae family). Rift Valley fever (RVF) is a viral disease that affects humans and domestic and wild ruminants.
![models number for valley pool table models number for valley pool table](http://www.billiardsforum.com/img/u/00000001/1518605054_1977-valley-coin-op-table-brochure.jpg)
Our results highlight the potential of very high spatial resolution remote sensing data for identifying environmental risk factors and mapping RVF risk areas at a local scale. The final risk map of RVF transmission displays a heterogeneous spatial distribution, corroborating previous findings from the same area. ResultsĪmong the derived landscape variables, the vegetation density index (VDI) computed within a 500 m buffer around ponds was positively correlated with serologic incidence ( p<0.001), suggesting that the risk of RVF transmission was higher in the vicinity of ponds surrounded by a dense vegetation cover. Finally, the best statistical model according to the Akaike Information Criterion corrected for small samples ( AIC C), was used to map areas at risk for RVF.
![models number for valley pool table models number for valley pool table](https://www.valley-dynamo.com/vdus/wp-content/uploads/2019/10/tigercatbumperfull.png)
Then, the relationships between landscape attributes and RVF serologic incidence rates in small ruminants were analyzed through a beta-binomial regression. Based on knowledge of vector and disease ecology, seven landscape attributes were defined at the pond level and computed from the land-cover map. In order to test whether pond characteristics may influence the density and the dispersal behaviour of RVF vectors, and thus the spatial variation in RVFV transmission, we used a very high spatial resolution remote sensing image (2.4 m resolution) provided by the Quickbird sensor to produce a detailed land-cover map of the study area. The study was carried out around Barkedji village, Ferlo region, Senegal. Here, a landscape approach developed at a local scale is proposed for extracting mosquito favourable biotopes, and for testing ecological parameters when identifying risk areas of Rift Valley fever (RVF) transmission.
![models number for valley pool table models number for valley pool table](https://i.pinimg.com/originals/ca/97/56/ca9756660af003dc7187e2a3a017562b.jpg)
Landscape changes are indicators of human activities or natural processes that are likely to modify the ecology of the diseases. Dynamics of most of vector-borne diseases are strongly linked to global and local environmental changes.