Tanzania Commission for Science & Technology

The present trial will evaluate safety and tolerability as well as the vaccine-induced humoral and cellular immune responses in healthy Tanzanian adults, adolescents, children, and infants who receive doses of 1.8x10^6, 9.0x10^5, 4.5x10^5 or 2.7x10^5 PfSPZ of PfSPZ Vaccine by direct venous inoculation (DVI),compared with control groups receiving normal saline (NS) placebo by DVI. In addition, as an exploratory objective, controlled human malaria infection (CHMI) will be used to assess efficacy in adults three weeks following immunization.

This trial will evaluate whether relatively non-immune populations in endemic countries can effectively generate significant cellular and humoral immune responses that confer protection against P. falciparum infection after inoculation of aseptic, purified, vialed, metabolically active, non-replicating (live, radiation attenuated) Plasmodium falciparum sporozoites (PfSPZ Vaccine) administered intravenously (IV).