Fig. 6

a Interpolated distribution of P. knowlesi cases in Johor using kriging interpolation method illustrating zonation of high and low area. b–d P. knowlesi cases overlaid with environmental factors. b P. knowlesi casesoverlaid with elevation; from high elevation (black) area to low elevation area (grey). c P. knowlesi cases overlaid with tree cover and; d tree loss from year 2011–2019