Immunization of Human Volunteers With P. Vivax Irradiated Sporozoites (SPZ-Irrad)

• ClinicalTrials.gov Identifier: NCT01082341
• Recruitment Status: Completed
• First Posted: March 8, 2010
• Last Update Posted: March 23, 2018
• Sponsor: Malaria Vaccine and Drug Development Center
• Collaborators: National Heart, Lung, and Blood Institute (NHLBI); Asoclinic Inmunología Ltda.
• Information provided by (Responsible Party): Socrates Herrera Valencia, Malaria Vaccine and Drug Development Center

Study Description

Brief Summary:

It is possible to safely protect human volunteers immunized with P. vivax irradiated sporozoites from P. vivax challenge with live sporozoites.

Condition or disease	Intervention/treatment	Phase
Malaria	Biological: Immunization with P. vivax irradiated sporozoites	Phase 1; Phase 2

Detailed Description:

Title: Phase 1 and Phase 2a Clinical Trial: Immunization of human volunteers with P. vivax irr-spz. (Short name: Irrad-SPZ) Population 27 healthy adult volunteers, males and non-pregnant females, between 18-45 years of age, who fulfill inclusion/exclusion criteria (described below) as determined by clinical history and serological tests. Approximately 20 parasitized blood-donor volunteers will be required to infected Anopheles mosquitoes which will be used to immunize volunteers with a total of 1000-1500 infected mosquitoes, during 8-10 months. Afterwards challenge to prove protection.

Number of Sites: 2 Study Duration: 2 years. Subject Duration : Step1: 1-2 hours to blood donors; Step 2 and 3: 2 years to immunized volunteers Objectives Primary

• To assess the safety and protective efficacy of P. vivax irradiated sporozoite vaccination.

Secondary

• To determine the immune responses and duration elicited by the P. vivax challenge in human Fy(+) volunteers previously immunized with irr-spz, as compared with non-immunized human volunteers.
• To determine the immune responses and duration elicited by irr-spz immunization scheme in human Fy(+) volunteers; comparing it with the same immunization scheme with non irr-spz in Fy(-) participants, and also with controls exposed to the same mosquito bite scheme as that of immunization but using mosquitoes without parasite infection.
• To study new antigens potentially useful to induce pre-erythrocytic protection against P. vivax malaria infection

Study Design

• Study Type: Interventional (Clinical Trial)
• Actual Enrollment: 27 participants
• Allocation: Randomized
• Intervention Model: Parallel Assignment
• Masking: None (Open Label)
• Primary Purpose: Prevention
• Official Title: Phase 1 and Phase 2a Clinical Trial:Immunization of Human Volunteers With P. Vivax Irradiated Sporozoites
• Study Start Date: June 2012
• Actual Primary Completion Date: May 2015
• Actual Study Completion Date: September 2017

Arms and Interventions

Arm	Intervention/treatment
Experimental: Fy(+); 14 Fy(+) human volunteers in the experimental group will be immunized with 1,000-2,000 P. vivax irrad-spz bites	Biological: Immunization with P. vivax irradiated sporozoites; 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.; Other Name: P. vivax irradiated sporozoites vaccine
Active Comparator: Fy(+) control; Seven Fy(+) volunteers in the control group will be exposed to non-infected mosquito bites.	Biological: Immunization with P. vivax irradiated sporozoites; 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.; Other Name: P. vivax irradiated sporozoites vaccine
Active Comparator: Fy(-); Six Fy(-) volunteers will be exposed to infective mosquito bites.	Biological: Immunization with P. vivax irradiated sporozoites; 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.; Other Name: P. vivax irradiated sporozoites vaccine

Outcome Measures

Primary Outcome Measures :

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. [ Time Frame: 2 years ]

Secondary Outcome Measures :

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 [ Time Frame: 2 years ]

Eligibility Criteria

• Ages Eligible for Study: 18 Years to 45 Years (Adult)
• Sexes Eligible for Study: All
• Accepts Healthy Volunteers: Yes

Criteria

Inclusion Criteria:

• • 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.

Exclusion Criteria:

• 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.

Contacts and Locations

Locations

Colombia

Malaria Vaccine of Develepmente Center

Cali, Valle, Colombia

Sponsors and Collaborators

Malaria Vaccine and Drug Development Center

National Heart, Lung, and Blood Institute (NHLBI)

Asoclinic Inmunología Ltda.

Investigators

• Principal Investigator: Socrates Herrera, MD; Malaria Vaccine Develepment Center

More Information

Additional Information:

www.inmuno.org 

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Publications automatically indexed to this study by ClinicalTrials.gov Identifier (NCT Number):

Arevalo-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.

• Responsible Party: Socrates Herrera Valencia, Director, Malaria Vaccine and Drug Development Center
• ClinicalTrials.gov Identifier: NCT01082341
• Other Study ID Numbers: MVDC-2008-005; SPZ IRR HUMAN ( Other Identifier: MVDC ); 5R01HL086488-02 ( U.S. NIH Grant/Contract )
• First Posted: March 8, 2010
• Last Update Posted: March 23, 2018
• Last Verified: March 2018

Keywords provided by Socrates Herrera Valencia, Malaria Vaccine and Drug Development Center:

GCP Good Clinical Practice; IFAT Indirect Immunofluorescence antibody test; MFA Membrane Feeding Assay; N Number (typically refers to subjects); RBC Red Blood Cells; SOP Standard Operating Procedure; TBS Thick blood smear; P. Vivax; irradiated sporozoite vaccination.

Additional relevant MeSH terms:

Malaria; Protozoan Infections; Parasitic Diseases; Infections; Mosquito-Borne Diseases; Vector Borne Diseases; Vaccines; Immunologic Factors; Physiological Effects of Drugs