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NCT ID: NCT03590340 Completed - Malaria Clinical Trials

Regimen Optimization Trial of PfSPZ Vaccine in Equatorial Guinea

Start date: July 30, 2018
Phase: Phase 1
Study type: Interventional

This is a phase 1, randomized regimen optimization study of PfSPZ Vaccine in healthy Equatoguinean volunteers to determine if a condensed, rapid immunization regimen is safe and efficacious. Four different regimens 4 weeks or less in duration will be evaluated for safety, tolerability, immunogenicity, and protective efficacy in comparison to a gold standard 16-week regimen.

NCT ID: NCT02859350 Completed - Malaria Clinical Trials

Safety, Tolerability and Immunogenicity of PfSPZ Vaccine in an Age De-escalation Trial in Equatorial Guinea.

Start date: November 2016
Phase: Phase 1
Study type: Interventional

This trial will evaluate the safety, tolerability, and immunogenicity of PfSPZ Vaccine in healthy Equatoguinean adults, adolescents, children and infants who receive doses of 0.9x10^6, 1.8x10^6 or 2.7x10^6 PfSPZ Vaccine via direct venous inoculation (DVI) compared with control groups receiving normal saline (NS) placebo by DVI. In addition, the study will also assess a second PfSPZ-based vaccination approach known as PfSPZ-CVac- the administration of non-irradiated, infectious PfSPZ (PfSPZ Challenge) (1x10^5 PfSPZ) under anti-malarial chemoprophylaxis (chloroquine) in younger adults ages 18 to 35 years for safety, tolerability, immunogenicity and efficacy against controlled human malaria infection (CHMI).

NCT ID: NCT02418962 Completed - Malaria Clinical Trials

Safety and Immunogenicity of Direct Venous Inoculation of a Radiation-attenuated PfSPZ Vaccine in Equatoguinean Adults

Start date: March 2015
Phase: Phase 1
Study type: Interventional

This is a single center, randomized, placebo-controlled, double-blind trial to assess the safety and immunogenicity of PfSPZ Vaccine administered by direct venous inoculation (DVI). The study to be conducted in Baney District, Bioko Island, Equatorial Guinea (EG), will be to establish whether three doses of the higher regimen - three doses of 2.7x10^5 PfSPZ of the PfSPZ Vaccine administered at 8 week intervals - is as well-tolerated and efficacious in malaria exposed African adults as the five dose regimens. Specifically, the trial will address the following objectives: is the three dose regimen: 1. Safe and well tolerated in Equatoguinean (EG) adults. 2. As immunogenic in EG adults as is the five-dose regimen of 1.35x10^5 PfSPZ in Tanzanian and U.S. adults or as three-, four- and five-dose regimens of 2.7x10^5 PfSPZ being tested in Tanzanian, Malian and U.S. adults. In addition, as an exploratory objective, the volunteers in the EG trial will be followed longitudinally to measure the incidence of malaria during the initial six months following immunization, providing a preliminary assessment of efficacy.