All of the following factors contribute to Resurgence of malaria, except:
Drug resistance in the host does not contribute to Resurgence of malaria, whereas Drug resistance in vectors and parasites and antigenic variations in parasites leads to resugence of malaria. Ref: The Anthropology of Infectious Disease : International Health Perspectives By Marcia Claire Inhorn, Peter J. Brown, Pages 119-127; Medical Disorders in Pregnancy : An Update By Hiralal Konar, Pralhad Kushtagi, Page 77.
Drug Resistance in host
Drug Resistance in parasite
Drug Resistance in vectors
Antigenic variations in parasite