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Table 2 Numbers of publications that reported specific factors as influential for occurrence of Rift Valley fever.

From: Application of knowledge-driven spatial modelling approaches and uncertainty management to a study of Rift Valley fever in Africa

Factor Number of reports Epidemic or endemic? Geographic data coverage available?
Climatic factors:    
   Higher rain than normal/floods 17 Epidemic Indirectly
   Annual rainfall 10 Both Yes
   Vegetation/NDVI 6 Both Yes
   Length and timing of rain 4 Epidemic Indirectly
   Temperature 3 Both Yes
Hydrological factors:    
   Proximity to lake/dam 6 Both Yes
   Irrigation 6 Both No
   Dambos/accumulated water 5 Epidemic Indirectly
   Proximity to river 3 Both Yes
Topographic factors:    
   Land-cover type 4 Both Yes
   Low-lying elevation 3 Both Yes
   Ecological zone 3 Both Yes
Host and vector factors:    
   Human factors 10 Epidemic No
   Vector abundance 7 Both No
   Importing infected animals 6 Epidemic No
   Moving livestock to endemic focus 4 Epidemic No
   Breed and other livestock factors 4 Both No
   Sheep present 2 Epidemic Indirectly
   Livestock density 1 Both Yes
   Natural hosts/small mammals 1 Both No
  1. Data were obtained via a systematic review of the literature. The availability of geographical information system-compatible electronic data for each variable was determined by a wide source of potential sources, including the internet.