Experimental Human Malaria Infection by PfSPZ

Malaria Clinical Trial

Official title: Experimental Human Malaria Infection by Intradermal Injection of Plasmodium Falciparum Sporozoites (PfSPZ Challenge)

Status Completed

Clinical Trial Summary

The study is a single center, varied dose, open label study. A maximum of eighteen volunteers will be exposed to live NF54 P. falciparum sporozoites (PfSPZ Challenge) by intradermal injection. Volunteers will be divided into three groups of 6 volunteers, each group spaced 25 days apart (21 days after the last challenge of the last volunteer from the previous dose group).

Clinical Trial Description

In every group on day 1, two volunteers will be injected. On day 3 the remaining four volunteers of the group will be injected. Injections in subsequent volunteers are always spaced at least one hour apart in any group. Injection of subsequent (groups of) volunteers will only commence if the previous injection was shown to be safe. Three different doses of PfSPZ will be administered: a dose of 2,500 PfSPZ Challenge (Group 1); a dose of 10,000 PfSPZ Challenge (Group 2) if not all volunteers become thick smear positive (TS+) in Group 1; and a dose of 25,000 PfSPZ Challenge (Group 3) if there is not 100% TS+ in Group 2. If all volunteers in Group 1 (2,500 PfSPZ Challenge) become thick smear positive, then Group 2a will receive 1,000 PfSPZ Challenge. If all volunteers in Group 2a become TS+, the volunteers in Group 3a will receive 500 PfSPZ Challenge. If all volunteers in Group 2 (10,000 PfSPZ Challenge) become TS+, Group 3b will receive 5,000 PfSPZ. If less than 100% of volunteers in Group 2a (1,000 PfSPZ Challenge) become TS+ then Group 3c will receive 1,750 PfSPZ Challenge.

The clinical, biological, parasitological and immunological data of these groups' volunteers will be compared. Volunteers and the investigator will not be blinded, but the laboratory personnel will be blinded. ;

Study Design

Allocation: Non-Randomized, Endpoint Classification: Safety/Efficacy Study, Intervention Model: Single Group Assignment, Masking: Open Label

Related Conditions & MeSH terms

• Malaria

• NCT number: NCT01086917
• Study type: Interventional
• Source: Sanaria Inc.
• Status: Completed
• Phase: Phase 1
• Start date: August 2010
• Completion date: July 2011