Immunization of Human Volunteers With P. Vivax Irradiated Sporozoites
SPZ-Irrad
Phase 1 and Phase 2a Clinical Trial:Immunization of Human Volunteers With P. Vivax Irradiated Sporozoites
3 other identifiers
interventional
27
1 country
1
Brief Summary
It is possible to safely protect human volunteers immunized with P. vivax irradiated sporozoites from P. vivax challenge with live sporozoites.
Trial Health
Trial Health Score
Automated assessment based on enrollment pace, timeline, and geographic reach
participants targeted
Target at P25-P50 for phase_1
Started Jun 2012
Longer than P75 for phase_1
1 active site
Health score is calculated from publicly available data and should be used for screening purposes only.
Trial Relationships
Click on a node to explore related trials.
Study Timeline
Key milestones and dates
First Submitted
Initial submission to the registry
March 5, 2010
CompletedFirst Posted
Study publicly available on registry
March 8, 2010
CompletedStudy Start
First participant enrolled
June 1, 2012
CompletedPrimary Completion
Last participant's last visit for primary outcome
May 1, 2015
CompletedStudy Completion
Last participant's last visit for all outcomes
September 1, 2017
CompletedMarch 23, 2018
March 1, 2018
2.9 years
March 5, 2010
March 21, 2018
Conditions
Keywords
Outcome Measures
Primary Outcomes (1)
Three groups are considered to be intervened. Experimental, Control and Fy(-) groups. Comparison will be done between E and C groups for protective efficacy. For immune response tests E vs Fy(-),E vs Fy(-), and Fy(-) vs C, pairs will be compared.
2 years
Secondary Outcomes (1)
The number of subjects reporting any AEs, the occurrence of specifics AEs, and discontinuation due to AEs will be tabulated. Frequency of AEs will be cross-tabulated by group for each immunization session
2 years
Study Arms (3)
Fy(+)
EXPERIMENTAL14 Fy(+) human volunteers in the experimental group will be immunized with 1,000-2,000 P. vivax irrad-spz bites
Fy(+) control
ACTIVE COMPARATORSeven Fy(+) volunteers in the control group will be exposed to non-infected mosquito bites.
Fy(-)
ACTIVE COMPARATORSix Fy(-) volunteers will be exposed to infective mosquito bites.
Interventions
Anopheles albimanus mosquitoes will be infected by artificial membrane feeding using blood from P. vivax infected donors. Once mosquitoes are positive will be irradiated at 15000 cGy and kept in boxes until use. 14 Fy(+) human volunteers in the experimental group will be immunized with 1,000-2,000 P. vivax irrad-spz bites. Seven Fy(+) volunteers in the control group will be exposed to non-infected mosquito bites. Six Fy(-) volunteers will be exposed to infective mosquito bites. For the challenge both the immunized and control groups will be exposed to 3 ± 1 infective mosquito bites. Volunteers will be closely monitored post infection and will be treated with antimalarials.
Eligibility Criteria
You may qualify if:
- Healthy 18 to 45 years old man or non-pregnant women.
- To have the capacity to sign an informed consent in a free and voluntary way.
- Have an acceptable understanding of the clinical trial through the approval of a questionnaire regarding the information given in the consent process.
- Obligatory use of adequate contra-conceptive method from beginning of recruitment and screening time up to three months after last immunization
- Do not have chronic or acute diseases. These conditions will be determined by clinical history, physical exam and laboratory tests.
- To accept not traveling to malaria endemic areas during the clinical trial should
- To have telephone at home or mobile phone that permit permanent contact for follow up
- He (she) manifest that is willing to participated during both steps of the clinical trial.
You may not qualify if:
- Volunteers with less than 18 old year or more than 45 old years.
- Pregnant and suckling women will be excluded. Pregnancy will be determined both by interview, and by serum B-subunit chorionic gonadotrophin testing.
- History of moderate or severe insect, or food allergies.
- G-6PD deficiency or any Hb genetic defect (for example; sickle cell disease)
- Previous malaria infection demonstrated by think smear, PCR or specific antimalarial antibodies.
- If the subject has previously participated in a malarial vaccine trial.
- Clinical record of allergies to drug or insect bites.
- Symptoms, signs or data from laboratory test that suggests to the physician any systemic disorder like renal, hepatic, cardiovascular, pulmonary, psychiatric disorders or other illnesses that could interfere with results of clinical trial or could compromise the health of the volunteer.
- To have antibodies against hepatitis C, VIH, or hepatitis B superficial antigen and/or hepatitis B core antibodies.
- To have any abnormality in the parameters assessed by blood laboratory tests. Base-line values will be established before initiation of the clinical trial.
- Presence or history of an auto-immune disease such as; Asthma, lupus, rheumatoid arthritis, Graves's disease, Hashimoto tyroiditis, and others.
- History of surgical removal of the spleen (splenectomy).
- Volunteer with medical treatment known to alter the immune system before 3 months to recruitment, such as; cortico-steroids, chemotherapeutic agents, fludarabine, cyclosporine, tacrolimus, mycophenolate mofetil, rapamycine, ATG, alemtuzumab.
- Alcoholism or drug abuse that may interfere with social relationship of individual.
Contact the study team to confirm eligibility.
Sponsors & Collaborators
Study Sites (1)
Malaria Vaccine of Develepmente Center
Cali, Valle del Cauca Department, Colombia
Related Publications (114)
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PMID: 38307966DERIVEDArevalo-Herrera M, Vasquez-Jimenez JM, Lopez-Perez M, Vallejo AF, Amado-Garavito AB, Cespedes N, Castellanos A, Molina K, Trejos J, Onate J, Epstein JE, Richie TL, Herrera S. Protective Efficacy of Plasmodium vivax Radiation-Attenuated Sporozoites in Colombian Volunteers: A Randomized Controlled Trial. PLoS Negl Trop Dis. 2016 Oct 19;10(10):e0005070. doi: 10.1371/journal.pntd.0005070. eCollection 2016 Oct.
PMID: 27760143DERIVED
Related Links
MeSH Terms
Conditions
Interventions
Condition Hierarchy (Ancestors)
Intervention Hierarchy (Ancestors)
Study Officials
- PRINCIPAL INVESTIGATOR
Socrates Herrera, MD
Malaria Vaccine Develepment Center
Study Design
- Study Type
- interventional
- Phase
- phase 1
- Allocation
- RANDOMIZED
- Masking
- NONE
- Purpose
- PREVENTION
- Intervention Model
- PARALLEL
- Sponsor Type
- OTHER
- Responsible Party
- PRINCIPAL INVESTIGATOR
- PI Title
- Director
Study Record Dates
First Submitted
March 5, 2010
First Posted
March 8, 2010
Study Start
June 1, 2012
Primary Completion
May 1, 2015
Study Completion
September 1, 2017
Last Updated
March 23, 2018
Record last verified: 2018-03