The model is adapted from S. Saralamba, et al., "Intrahost Modeling of Artemisinin Resistance in Plasmodium Falciparum," PNAS, 108(1), 2011 pp. 397-402. (http://www.pnas.org/content/108/1/397.short)
The Mathematica notebook of this model can also be downloaded from http://www.demonstrations.wolfram.com/AModelOfPlasmodiumFalciparumPopulationDynamicsInAPatientDuri/