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One of the bottlenecks in the development of a whole sporozoite malaria vaccine is the route and method of sporozoite administration. Immunization and challenge of human volunteers by mosquito bites is effective, but cannot be used as a vaccine. Intravenous immunization with sporozoites is effective in rodents and non-human primates, and being studied in humans, but is not yet used for licensed vaccines...
The critical first step in the clinical development of a malaria vaccine, based on live-attenuated Plasmodium falciparum sporozoites, is the guarantee of complete arrest in the liver. We report on an approach for assessing adequacy of attenuation of genetically attenuated sporozoites in vivo using the Plasmodium berghei model of malaria and P. falciparum sporozoites cultured in primary human hepatocytes...
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