At a glance
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VAC069: A Clinical Study to Assess the Safety and Feasibility of Controlled Blood-stage Plasmodium Vivax Human Malaria Infection Through Experimental Inoculation of Cryopreserved Infected Erythrocytes in Healthy Malaria-naïve UK Adults
In Brief
A Early Phase 1 clinical trial evaluating P. vivax infected inoculum (parasitised red blood cells) for Malaria, Vivax. Completed, enrolled 19 participants across 1 site.
Detailed Summary
This is a clinical study to assess the safety and feasibility of Plasmodium vivax (P. vivax) controlled blood-stage human malaria infection (CHMI), by inoculation using a newly created source of P. vivax malaria-infected blood. 25 healthy malaria-naïve UK volunteers, aged 18 - 50, will be recruited through the five phases of the study at the CCVTM, Oxford. Volunteers will undergo primary, secondary and tertiary P. vivax blood-stage challenges, which will be induced by injection of P. vivax infected blood. After the first challenge, the optimal dose for blood-stage CHMI will be selected and used for the second and third challenges. Through each challenge period, volunteers will have blood taken at regular intervals to measure the parasite growth, quantify the sexual parasite forms and assess the immune response to P. vivax infection. Transmission of P. vivax from volunteers to the Anopheline mosquito vectors will also be assessed. In each challenge, following diagnosis, volunteers will be treated with a standard antimalarial course of oral artemether-lumefantrine (Riamet), given over 60 hours. Volunteers who take part in this study will be involved in the trial for approximately 2 years, receiving each of the three challenges at intervals of approximately 5 (and up to 9) months. Volunteers will be followed for 3 months after their last challenge.
Study Details
Timeline
Interventions
In the first controlled human malaria infection (CHMI, Phase A), inoculation of parasitised red blood cells will be at three different doses (1 vial, 1:5 dilution, 1:20 dilution). The optimal inoculation dose will then be selected and administered to all participants in each of the second and third CHMI.