Figure 4.

Age-stratified seroprevalence of RVF antibodies in cattle in two sites in Cameroon in 2012. The predicted seroprevalence based on a simple age quadratic function (blue) and the force of infection (FOI) (λ) based on the Muench (red circle/solid line), the Griffth's model (red triangle/dashed line), and the Grenfell Anderson model (red cross/dotted line). The black circles show the mean seroprevalence for that age strata with the size proportional to the number of animals in that age strata.