Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & ContributorsVaccinations and Herd Immunity Using the SIR Disease Epidemic Modelhttp://demonstrations.wolfram.com/VaccinationsAndHerdImmunityUsingTheSIRDiseaseEpidemicModel/]]>http://demonstrations.wolfram.com/VaccinationsAndHerdImmunityUsingTheSIRDiseaseEpidemicModel/