Abstract
Despite nearly 80 years of vaccine research and control efforts, malaria remains one of the most prevelant of all infectious diseases. The fact that people living in regions in which malaria is endemic eventually develop immunity to the parasite and the disease suggest that it might be possible to develop vaccines against malaria. Although few vaccination trials were conducted with whole parasites, the only protocol that leads to the induction of sterile immunity in humans relies on immunization with attenuated parasites. This observation has spurred the search for subunit vaccines that aim to reproduce this protection. As yet, none of the current candidate subunit vaccines have achieved complete protection reproducibly. This failure, coupled with the recent advent of the genetically modified Plasmodium parasites, has led to a renewed interest in the use of live parasites for vaccination. This article reviews past studies, summarizes recent developments in this field and discusses the challenges to be overcome before mass immunization with live parasites could be envisaged.
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