Add a legend to the map describing which colour corresponds to which data (infected, dead, recovered).
Also, clicking on the legend should show/hide the circle markers corresponding to the data in question (e.g. clicking on 'infected' will show/hide all 'infected' markers).
Add a legend to the map describing which colour corresponds to which data (infected, dead, recovered). Also, clicking on the legend should show/hide the circle markers corresponding to the data in question (e.g. clicking on 'infected' will show/hide all 'infected' markers).