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Plasmodium vivax is the most widely distributed human malaria parasite in the world and despite nearly 2.5 billion people living at risk, only four vaccines have been assessed in phase I clinical trials and only one has progressed to a phase II trial showing no sterile efficacy. We started to develop new challenge models to assess the efficacy of several new P. vivax pre-erythrocytic vaccine candidates (PVX_091700; PVX_121950; PVX_084090; PVX_099035; PVX_095375; PVX_000975; PVX_003665; PVX_000810) in mice. Our model is based on creating mutant P. berghei (rodent malaria) lines expressing P. vivax antigens through a new method called “Gene Insertion/Marker out” (GIMO). In addition, we are cloning the P. vivax pre-erythrocytic vaccine candidates in recombinant chimpanzee adenovirus (ChAd) and modified vaccine Ankara (MVA) vectors. Upon generation of transgenic parasites and recombinant viruses, a faster assessment to determinate the efficacy of all new P. vivax vaccine candidates can be achieved by using prime/boost immunization regimens followed by a challenge with corresponding transgenic chimera parasites.

Development of novel vaccine candidates and challenge models for Plasmodium vivax