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CompletedNCT03952650Updated Jul 12, 2022Results posted

Sanaria PfSPZ Challenge With Pyrimethamine or Chloroquine Chemoprophylaxis Vaccination (PfSPZ-CVac Approach): A Randomized Double Blind Placebo Controlled Phase I/II Trial to Determine Safety and Protective Efficacy Against Natural Plasmodium Falcipa...

A Phase 1/2 interventional study of Chloroquine Phosphate and PfSPZ Challenge in Malaria, sponsored by National Institute of Allergy and Infectious Diseases (NIAID). Completed at 1 site in Mali. Open to participants aged 18 Years to 50 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2022-07-12.

Sponsored by National Institute of Allergy and Infectious Diseases (NIAID) · Phase 1/2, Interventional, and Other

Phase
Phase 1/2
Study type
Interventional
Enrollment
252
Allocation
Randomized
Ages
18 Years to 50 Years
Sex
All
01

Study summary

Background:

Malaria remains a major global health problem. Malaria is spread by the bite of mosquitos. Africa is the region of the world where most people get malaria. Sanaria PfSPZ Challenge is a malaria vaccine. Researchers want to see if the vaccine combined with partner drugs can help protect against malaria.

Objective:

To test if injections with 3 monthly doses of Sanaria PfSPZ Challenge, combined with either pyrimethamine (PYR) or chloroquine as a partner drug, is safe, tolerable, and effective.

Eligibility:

Healthy people ages 18-50 years who live in Bancoumana, Mali, or nearby

Design:

Participants will be screened with the Malaria Comprehension Exam to check their understanding of the study. They will have a medical history. They will have a physical exam. They will have blood tests, urine tests, and heart tests.

Participants will join either the pilot study or the main study.

Participants will be assigned to groups. Depending on their group, they will get at least one injection of either a placebo or the vaccine. They may have up to 3 vaccines, 4 weeks apart. The injection will be into a vein with a needle.

Participants will also take pyrimethamine or chloroquine by mouth. They will also take standard doses of antimalarial drugs by mouth.

Participants will have blood tests throughout the study.

Participants may develop a rash or injection site reaction. If this happens, photos of the site may be taken.

Participants will be observed for infection for many days after the injections.

Read the detailed description

Human studies have shown that immunization by the bite of Plasmodium falciparum (Pf) sporozoite (SPZ)-infected mosquitoes (chemoprophylaxis with sporozoites [CPS]) or by injecting aseptic, purified, cryopreserved sporozoites (SPZ) with needle and syringe (PfSPZ chemoprophylaxis vaccination, Sanaria PfSPZ-CVac) under drug coverage with chloroquine can provide >80% protection against homologous controlled human malaria infection (CHMI) (Roestenberg, McCall et al. 2009, Roestenberg, Teirlinck et al. 2011, Mordmuller, Surat et al. 2017). The protective immunity induced by CPS/PfSPZ-CVac is thought to target sporozoite and liver stage antigens, but the transient parasitemia observed under chloroquine prophylaxis may additionally induce immune responses targeting blood stage parasites that contribute to protection. It is important to understand the contribution of each stage in this model as transient parasitemia in the immunization process adds a safety concern and may impair the development of immunity.

We have conducted two phase 1 studies to explore whether significant protective efficacy can be achieved with exclusively pre-erythrocytic (sporozoite/liver stage) exposure in this model using PYR chemoprophylaxis. This drug, unlike chloroquine, kills the parasites in the liver, so there is no period of transient parasitemia following immunization. These studies in malaria na(SqrRoot) ve adults demonstrated that PfSPZ-CVac (with PYR administered 2 \& 3 days after injection) is safe, well-tolerated, and can prevent subpatent and patent parasitemia after PfSPZ injection. The NCT02511054 study used the same dose (5.12x104 PfSPZ) that has resulted in >80% protection in previous trials of PfSPZ-CVac (chloroquine), showed only 2/9 vaccinees were protected against a homologous (same strain of Pf as the vaccine) CHMI. In trials using irradiated SPZ, increasing the dose of PfSPZ used for immunization has resulted in higher protective efficacy. Therefore, in an ongoing trial, NCT03083847, we have increased the PfSPZ dose about 4-fold up to 2.0x105 PfSPZ, with preliminary results show markedly improved protection against both homologous and heterologous CHMI in healthy US adults (7/8 and 4/4 study subjects uninfected, respectively). This is the first demonstration that the PfSPZ-CVac approach can confer sterile protection without blood stage exposure.

Building on these promising results from PfSPZ-CVac (pyrimethamine) in the US, this proposed study in a malaria-endemic, adult population in Bancoumana, Mali will initially assess, in a pilot phase, the safety and tolerability of still higher doses of PfSPZ Challenge (4.0x105 PfSPZ) in combination with PYR (day 0;) or chloroquine (days -2, +5). The higher PfSPZ dose is hypothesized to be necessary to achieve significant efficacy against naturally transmitted malaria in malaria-experienced populations. Once this higher dose of PfSPZ is determined to be safe and tolerable and that earlier PYR dosing prevents patent parasitemia, the main phase will explore the effect of both earlier PYR dosing and a higher dosage of PfSPZ used for immunization in the development of protective immunity against natural malaria infection. The results of this study will contribute to understanding the targets and mechanisms of immunity against Pf malaria infection, and how the degree of prior exposure to the parasite (pre-erythrocytic and/or erythrocytic stages) impacts these responses and subsequent protective efficacy in field settings.

After completion of follow up in the main phase, all participants that are still enrolled in the study will be offered a booster dose of the vaccine (4th dose) with a single dose of 4x10\^5 PfSPZ Challenge or normal saline (aligned with what they received in the main phase of the study) at approximately 11 months post 3rd vaccination. The booster dose is timed to allow administration well before the beginning of the ensuing malaria transmission season. Participants will then be followed for approximately 6 months to assess safety and vaccine efficacy through this second transmission season.

02

Conditions studied

  • Malaria

Browse trials for

Keywords

  • Field
  • Immunity
  • Chemoprophylaxis with Sporozoites
  • Vaccine
  • Malaria-Experienced
03

In context

Malaria

1,299 studies on the registry are indexed under Malaria; 86 are open to participants now.

This study's enrollment of 252 is above the median of 220 across 1,027 interventional studies indexed under Malaria.

Browse Malaria studies →

Lead sponsor

National Institute of Allergy and Infectious Diseases (NIAID) is the lead sponsor of 2,401 studies on the registry; 179 are open to participants now.

Of its 396 completed or terminated interventional studies of FDA-regulated products, 294 (74%) have results posted.

Counted across the registry records on this site, refreshed daily.

04

Who can participate

Ages eligible
18 Years to 50 Years
Sexes eligible
All
Accepts healthy volunteers
Yes

Inclusion criteria

  • Age greater than or equal to 18 and less than or equal to 50 years (for booster phase, age greater than or equal to 18 and less than or equal to 52 years)
  • Resident of Bancoumana or nearby areas
  • In good general health and without clinically significant medical history
  • Malaria comprehension exam completed, passed (a score of greater than or equal to 80% or per investigator s discretion) and reviewed prior to enrollment
  • Able to provide proof of identity to the satisfaction of the study clinician completing the enrollment process
  • Willing to have blood samples stored for future research
  • Available for the duration of the study

  • Females of childbearing potential must be willing to use reliable contraception (as defined below) from 21 days prior to first PfSPZ Challenge injection to 28 days following last PfSPZ Challenge exposure (or equivalent study day for Arm 5 controls). For the booster phase, this applies from 21 days prior to the booster vaccination to 28 days post booster vaccination.

    • Reliable methods of birth control include one of the following: confirmed pharmacologic contraceptives (parenteral) delivery; intrauterine or implantable device. OR
    • Reliable methods of birth control include concurrent use of a pharmacologic and a barrier method, i.e., two of the following: confirmed pharmacologic contraceptives (oral, transdermal) delivery or vaginal ring AND condoms with spermicide or diaphragm with spermicide. OR
    • Non-childbearing women will also be required to report date of last menstrual period, history of surgical sterility (i.e. tubal ligation, hysterectomy) or premature ovarian insufficiency (POI), and will have urine or serum pregnancy test performed per protocol.
  • For booster phase only: previously or currently enrolled in protocol #19-I-N099 and completed all three primary vaccinations.

Exclusion criteria

EXCLUSION CRITERIA:

  • Pregnancy, as determined by a positive urine or serum human choriogonadotropin (beta-hCG) test (if female)

    --NOTE: Pregnancy is also a criterion for discontinuation of any further dosing or non-safety related interventions for that subject.

  • Currently breast-feeding (if female)
  • Behavioral, cognitive, or psychiatric disease that in the opinion of the investigator affects the ability of the participant to understand and comply with the study protocol
  • Hemoglobin, WBC, absolute neutrophils, and platelets outside the local laboratorydefined limits of normal (subjects may be included at the investigator s discretion for 'not clinically significant' values)
  • Alanine transaminase (ALT) or creatinine (Cr) level above the local laboratoryMali PfSPZ-CVac (pyrimethamine) defined upper limit of normal (subjects may be included at the investigator s discretion for not clinically significant values)
  • Infected with human immunodeficiency virus (HIV), hepatitis C virus (HCV), or hepatitis B (HBV) (For the booster phase: re-testing NOT required for enrollment unless clinically indicated)
  • Known or documented sickle cell disease by history (Note: known sickle cell trait is NOT exclusionary)
  • Clinically significant abnormal electrocardiogram (ECG) (For the booster phase: re-testing NOT required for enrollment unless clinically indicated)
  • Moderate or high risk for coronary heart disease (CHD) based on NHANES I cardiovascular risk assessment
  • Evidence of clinically significant neurologic, cardiac, pulmonary, hepatic, endocrine, rheumatologic, autoimmune, hematological, oncologic, or renal disease by history, physical examination, and/or laboratory studies including urinalysis
  • History of receiving any other investigational product within the past 30 days
  • Participation or planned participation in a clinical trial with an investigational product prior to completion of the last required protocol follow-up visit
  • Medical, occupational, or family problems as a result of alcohol or illicit drug use during the past 12 months.
  • History of a severe allergic reaction or anaphylaxis
  • Severe asthma (defined as asthma that is unstable or required emergent care,urgent care, hospitalization, or intubation during the past 2 years, or that has required the use of oral or parenteral corticosteroids at any time during the past 2 years)
  • Pre-existing autoimmune or antibody-mediated diseases including but not limited to: systemic lupus erythematosus, rheumatoid arthritis, multiple sclerosis, Sj(SqrRoot)(Delta)gren s syndrome, or autoimmune thrombocytopenia
  • Known immunodeficiency syndrome
  • Known asplenia or functional asplenia
  • Use of:
  • a. Chronic (greater than or equal to 14 days) oral or IV corticosteroids (excluding topical or nasal) at immunosuppressive doses (i.e., prednisone >10 mg/day) or immunosuppressive drugs within 30 days of vaccination
  • b. Antimalarials for example artemether, artemether-lumefantrine, artesunate, artesunate-amodiaquine, other than those prescribed by the investigator as part of the study procedures within 14 days prior to the first vaccine
  • c. Systemic antibiotics with known antimalarial activity such as trimethoprim-sulfamethoxazole, doxycycline, tetracycline, clindamycin, erythromycin, ciprofloxacin or azithromycin within 5 half-lives of the drug prior to the first vaccine
  • Receipt of a live vaccine within the past 4 weeks or a killed vaccine within the past 2 weeks prior to Vaccination #1 and every subsequent vaccination day
  • Receipt of immunoglobulins and/or blood products within the past 6 months
  • Previous receipt of an investigational anti-infectivity malaria vaccine in the last 2 years (this requirement is waived for the booster phase)
  • Known allergies or contraindication against: PYR, chloroquine, NSAIDs, artemether, lumefantrine
  • Other condition(s) that, in the opinion of the investigator, would jeopardize the safety or rights of a participant participating in the trial, interfere with the evaluation of the study objectives, or would render the subject unable to comply with the protocol.
05

Study design

Phase
Phase 1 / Phase 2
Primary purpose
Other
Allocation
Randomized
Intervention model
Sequential assignment
Masking
Double (Participant, Investigator)
Enrollment
252 participants (actual)

Study arms

  • Experimental
    1a

    Receiving 400,000 PfSPZ with 75 mg pyrimethamine day 0 post PfSPZ

    Biological: PfSPZ Challenge · Drug: Pyrimethamine · Drug: Coartem

  • Experimental
    1b

    Receiving 400,000 PfSPZ with 75 mg pyrimethamine day 0 post PfSPZ

    Biological: PfSPZ Challenge · Drug: Pyrimethamine · Drug: Coartem

  • Experimental
    2a

    Receiving 400,000 PfSPZ with 75 mg pyrimethamine days 2\&3 post PfSPZ

    Biological: PfSPZ Challenge · Drug: Pyrimethamine · Drug: Coartem

  • Experimental
    2b

    Receiving 400,000 PfSPZ with 75 mg pyrimethamine days 2\&3 post PfSPZ

    Biological: PfSPZ Challenge · Drug: Pyrimethamine · Drug: Coartem

  • Experimental
    3a

    Receiving 400,000 PfSPZ with chloroquine 2 days prior + 5 days post PfSPZibuprofen (if necessary)

    Drug: Chloroquine Phosphate · Biological: PfSPZ Challenge · Drug: Coartem · Drug: ibuprofen

  • Experimental
    3b

    Receiving 400,000 PfSPZ with weekly chloroquineibuprofen (if necessary)

    Drug: Chloroquine Phosphate · Biological: PfSPZ Challenge · Drug: Coartem · Drug: ibuprofen

  • Placebo comparator
    4a

    Receiving normal saline with 75 mg pyrimethamine day 0 post injection

    Drug: Pyrimethamine · Drug: Coartem

  • Placebo comparator
    4b

    Receiving normal saline with 75 mg pyrimethamine days 2\&3 post injection

    Drug: Pyrimethamine · Drug: Coartem

  • Placebo comparator
    4c

    Receiving normal saline with weekly chloroquineibuprofen (if necessary)

    Drug: Chloroquine Phosphate · Drug: Coartem · Drug: ibuprofen

  • Experimental
    5a

    Receiving 300,000 PfSPZ with 75 mg pyrimethamine day 0 post PfSPZ (if necessary)

    Biological: PfSPZ Challenge · Drug: Pyrimethamine · Drug: Coartem

  • Experimental
    5b

    Receiving 300,000 PfSPZ with 75 mg pyrimethamine day 0 post PfSPZ

    Biological: PfSPZ Challenge · Drug: Pyrimethamine · Drug: Coartem

  • Experimental
    6a

    Receiving 300,000 PfSPZ with 75 mg pyrimethamine days 2\&3 post PfSPZ (if necessary)

    Biological: PfSPZ Challenge · Drug: Pyrimethamine · Drug: Coartem

  • Experimental
    6b

    Receiving 300,000 PfSPZ with 75 mg pyrimethamine days 2\&3 post PfSPZ (if necessary)

    Biological: PfSPZ Challenge · Drug: Pyrimethamine · Drug: Coartem

Interventions

  • DrugChloroquine Phosphate

    Chloroquine phosphate is approved for suppressive treatment (prophylaxis) and for acute attacks of malaria due to P. vivax, P. malariae, P. ovale, and susceptible strains of Pf. Chloroquine is a blood-stage schizonticide, highly active against replicating forms of blood-stage drug- sensitive parasites. As such, it is routinely employed as first-line prophylaxis against development of patent parasitemia and clinical malaria in non-immune travelers to areas with chloroquine sensitive Pf. In the pilot, chloroquine administration will begin with a loading dose 2 days prior to PfSPZ Challenge and finishing with a maintenance dose 5 days after PfSPZ Challenge. In the main phase, chloroquine will be first administered as a loading dose 2 days prior to PfSPZ Challenge and continuing weekly using a maintenance dose for a total of 10 doses, finishing with a last dose 5 days after the third injection with PfSPZ Challenge.

  • BiologicalPfSPZ Challenge

    PfSPZ Challenge (NF54) acts as the immunogen in the PfSPZ-CVac approach to vaccinating against malaria. Participants will receive either one (in the pilot phase) or 3 (in the main phase) 400,000 or 300,000 aseptic, purified, cryopreserved, fully infectious PfSPZ injections by DVI (with concurrent administration of antimalarial drugs). Following immunization, participants in the main phase will be followed through the transmission season in order to assess vaccine efficacy.

  • DrugPyrimethamine

    Pyrimethamine has been FDA approved for acute treatment and chemoprophylaxis of malaria due to susceptible strains of plasmodia. Pyrimethamine has been shown to possess both liver and blood stage activity. In this study, we plan to use a higher dose of pyrimethamine, 75 mg orally for either one or two days each month. The pilot arms will receive either a total of 1 daily dose or 2 daily doses. The main arms will receive a total of 3 daily doses or a total of 6 doses.

  • DrugCoartem

    Antimalarial (Coartem ) will be administered to all participants twice during the study, approximately 2 weeks prior to the first vaccination in order to clear pre-existing parasitemia that may interfere with immunity development. The second dose will be given approximately 2 weeks prior to the 3rd vaccination in order to clear any parasitemia infection that may have happened naturally during the vaccination period and prior to the follow up period.

  • Drugibuprofen

    Ibuprofen likewise is not a part of the investigational product/regimen, but will be provided to participants in the chloroquine arm (Arm 4) if required to mitigate typical symptoms of malaria infection such as headache, myalgia, fever and chills.

06

What researchers measure

Primary outcomes

  1. Number of Participants With Positive Sensitive Blood Smear (sBS)

    Count of participants with positive sensitive blood smear (sBS) occurring after PfSPZ-CVac immunization starting on day 7 post DVI. Only pilot phase arms (Arms 1a, 2a) were analyzed for this outcome measure. Arms 5a and 6a were not performed, as no patent parasitemia was observed in either Arms 1a or 2a, per the protocol.

    Time frame: 7 -12 days post-inoculation

  2. Number of Participants With Local and Systemic Grade 3 Adverse Events (AEs) and Serious Adverse Events (SAEs)

    Count of participants with local and systemic grade 3 signs or symptoms lasting more than 48 hours despite adequate management and serious adverse events (SAEs) occurring after PfSPZ-CVac DVI. Only arm 3a was analyzed for this outcome measure, per the protocol objectives.

    Time frame: From day of inoculation to 14 days post-inoculation

  3. Number of Participants With Local and Systemic Adverse Events (AEs) and Serious Adverse Events (SAEs)

    Count of participants with local and systemic adverse events (AEs) and serious adverse events (SAEs) occurring after PfSPZ-CVac immunization. This outcome measure applies to main phase arms 1b, 2b, 4a, and 4b. Arms 5b and 6b were not performed as patent parasitemia with the higher dose of PfSPZ was not observed in the pilot phase (Arms 1a, 2a).

    Time frame: For the main phase: from the day of inoculation to approximately 6 months post-3rd inoculation. For the booster phase: from the time of inoculation to approximately 6 months post-booster inoculation

07

Results

Posted Jul 12, 2022

Participant flow

Participant flow — Overall Study
Milestone1a - Pilot/Safety: Dosing Interval on Days: 11b - Safety/Efficacy: Dosing Interval on Days: 1, 29, 572a - Pilot/Safety: Dosing Interval on Days: 12b - Safety/Efficacy: Dosing Interval on Days: 1, 29, 573a - Pilot/Safety: Dosing Interval on Days: 14a - Safety Comparator: Dosing Interval on Days: 1, 29, 574b - Safety Comparator: Dosing Interval on Days: 1, 29, 57
Started49046045436
Completed48345344732
Not completed0707074
Withdrew: Travel0404032
Withdrew: Withdrawal by subject0203011
Withdrew: Lost to follow-up0100011
Withdrew: Received wrong vaccine and travelled0000010
Withdrew: Unable to make study visit0000010

Outcome measures

PrimaryNumber of Participants With Positive Sensitive Blood Smear (sBS)

Count of participants with positive sensitive blood smear (sBS) occurring after PfSPZ-CVac immunization starting on day 7 post DVI. Only pilot phase arms (Arms 1a, 2a) were analyzed for this outcome measure. Arms 5a and 6a were not performed, as no patent parasitemia was observed in either Arms 1a or 2a, per the protocol.

Time frame:
7 -12 days post-inoculation
Reported as:
Count of participants · Participants
Number of Participants With Positive Sensitive Blood Smear (sBS)
Participants1a - Pilot/Safety: Dosing Interval on Days: 12a - Pilot/Safety: Dosing Interval on Days: 1
Number of Participants With Positive Sensitive Blood Smear (sBS)00
PrimaryNumber of Participants With Local and Systemic Grade 3 Adverse Events (AEs) and Serious Adverse Events (SAEs)

Count of participants with local and systemic grade 3 signs or symptoms lasting more than 48 hours despite adequate management and serious adverse events (SAEs) occurring after PfSPZ-CVac DVI. Only arm 3a was analyzed for this outcome measure, per the protocol objectives.

Time frame:
From day of inoculation to 14 days post-inoculation
Reported as:
Count of participants · Participants
Number of Participants With Local and Systemic Grade 3 Adverse Events (AEs) and Serious Adverse Events (SAEs)
Participants3a - Pilot/Safety: Dosing Interval on Days: 1
Number of Participants With Local and Systemic Grade 3 Adverse Events (AEs) and Serious Adverse Events (SAEs)0
PrimaryNumber of Participants With Local and Systemic Adverse Events (AEs) and Serious Adverse Events (SAEs)

Count of participants with local and systemic adverse events (AEs) and serious adverse events (SAEs) occurring after PfSPZ-CVac immunization. This outcome measure applies to main phase arms 1b, 2b, 4a, and 4b. Arms 5b and 6b were not performed as patent parasitemia with the higher dose of PfSPZ was not observed in the pilot phase (Arms 1a, 2a).

Time frame:
For the main phase: from the day of inoculation to approximately 6 months post-3rd inoculation. For the booster phase: from the time of inoculation to approximately 6 months post-booster inoculation
Reported as:
Count of participants · Participants
Number of Participants With Local and Systemic Adverse Events (AEs) and Serious Adverse Events (SAEs)
Participants1b - Safety/Efficacy: Dosing Interval on Days: 1, 29, 572b - Safety/Efficacy: Dosing Interval on Days: 1, 29, 574a - Safety Comparator: Dosing Interval on Days: 1, 29, 574b - Safety Comparator: Dosing Interval on Days: 1, 29, 57
Number of Participants With Local and Systemic Adverse Events (AEs) and Serious Adverse Events (SAEs)88595136

Adverse events

Collected over One month for pilot phase; eight months for main phase; seven months for booster phase. Non-serious events are listed at a 0% frequency threshold.

Adverse event summary by group
GroupDeathsSeriousOther
1a - Pilot/Safety: Dosing Interval on Days: 10/4 (0%)0/4 (0%)1/4 (25%)
1b - Safety/Efficacy: Dosing Interval on Days: 1, 29, 571/90 (1.1%)1/90 (1.1%)88/90 (97.8%)
2a - Pilot/Safety: Dosing Interval on Days: 10/4 (0%)0/4 (0%)1/4 (25%)
2b - Safety/Efficacy: Dosing Interval on Days: 1, 29, 570/60 (0%)0/60 (0%)59/60 (98.3%)
3a - Pilot/Safety: Dosing Interval on Days: 10/4 (0%)0/4 (0%)2/4 (50%)
4a - Safety Comparator: Dosing Interval on Days: 1, 29, 570/54 (0%)1/54 (1.9%)51/54 (94.4%)
4b - Safety Comparator: Dosing Interval on Days: 1, 29, 570/36 (0%)0/36 (0%)36/36 (100%)
Most frequent serious events
Most frequent serious events
Event1a - Pilot/Safety: Dosing Interval on Days: 11b - Safety/Efficacy: Dosing Interval on Days: 1, 29, 572a - Pilot/Safety: Dosing Interval on Days: 12b - Safety/Efficacy: Dosing Interval on Days: 1, 29, 573a - Pilot/Safety: Dosing Interval on Days: 14a - Safety Comparator: Dosing Interval on Days: 1, 29, 574b - Safety Comparator: Dosing Interval on Days: 1, 29, 57
VolvulusGastrointestinal disorders0/40/900/40/600/41/540/36
Gun shot woundInjury, poisoning and procedural complications0/41/900/40/600/40/540/36
Most frequent other events
Showing 10 of 83
Most frequent other events
Event1a - Pilot/Safety: Dosing Interval on Days: 11b - Safety/Efficacy: Dosing Interval on Days: 1, 29, 572a - Pilot/Safety: Dosing Interval on Days: 12b - Safety/Efficacy: Dosing Interval on Days: 1, 29, 573a - Pilot/Safety: Dosing Interval on Days: 14a - Safety Comparator: Dosing Interval on Days: 1, 29, 574b - Safety Comparator: Dosing Interval on Days: 1, 29, 57
RhinitisInfections and infestations0/448/900/438/601/427/5422/36
MalariaInfections and infestations0/430/900/424/600/432/5419/36
HeadacheNervous system disorders0/427/900/424/600/424/5419/36
Blood creatinine increasedInvestigations0/438/901/427/600/417/5417/36
LeukopeniaBlood and lymphatic system disorders0/440/900/424/600/412/5413/36
NeutropeniaBlood and lymphatic system disorders0/436/900/414/600/411/5411/36
Dental cariesGastrointestinal disorders0/415/900/48/601/416/543/36
ConjunctivitisEye disorders0/49/900/47/600/414/548/36
Decreased appetiteMetabolism and nutrition disorders0/41/900/41/601/40/542/36
GastritisGastrointestinal disorders1/410/900/47/600/49/544/36

Baseline characteristics

Age, Categorical
Age, Categorical(Participants)1a - Pilot/Safety: Dosing Interval on Days: 11b - Safety/Efficacy: Dosing Interval on Days: 1, 29, 572a - Pilot/Safety: Dosing Interval on Days: 12b - Safety/Efficacy: Dosing Interval on Days: 1, 29, 573a - Pilot/Safety: Dosing Interval on Days: 14a - Safety Comparator: Dosing Interval on Days: 1, 29, 574b - Safety Comparator: Dosing Interval on Days: 1, 29, 57Total
<=18 years00000000
Between 18 and 65 years49046045436252
>=65 years00000000
Age, Continuous
Age, Continuous(years)1a - Pilot/Safety: Dosing Interval on Days: 11b - Safety/Efficacy: Dosing Interval on Days: 1, 29, 572a - Pilot/Safety: Dosing Interval on Days: 12b - Safety/Efficacy: Dosing Interval on Days: 1, 29, 573a - Pilot/Safety: Dosing Interval on Days: 14a - Safety Comparator: Dosing Interval on Days: 1, 29, 574b - Safety Comparator: Dosing Interval on Days: 1, 29, 57Total
Mean36.0 ± 14.434.6 ± 10.023.8 ± 10.834.5 ± 10.031.8 ± 10.934.6 ± 10.034.9 ± 9.934.5 ± 10.0
Sex: Female, Male
Sex: Female, Male(Participants)1a - Pilot/Safety: Dosing Interval on Days: 11b - Safety/Efficacy: Dosing Interval on Days: 1, 29, 572a - Pilot/Safety: Dosing Interval on Days: 12b - Safety/Efficacy: Dosing Interval on Days: 1, 29, 573a - Pilot/Safety: Dosing Interval on Days: 14a - Safety Comparator: Dosing Interval on Days: 1, 29, 574b - Safety Comparator: Dosing Interval on Days: 1, 29, 57Total
Female2270213191284
Male26343913524168
Race/Ethnicity, Customized
Race/Ethnicity, Customized(Participants)1a - Pilot/Safety: Dosing Interval on Days: 11b - Safety/Efficacy: Dosing Interval on Days: 1, 29, 572a - Pilot/Safety: Dosing Interval on Days: 12b - Safety/Efficacy: Dosing Interval on Days: 1, 29, 573a - Pilot/Safety: Dosing Interval on Days: 14a - Safety Comparator: Dosing Interval on Days: 1, 29, 574b - Safety Comparator: Dosing Interval on Days: 1, 29, 57Total
Malinke37435344830215
Bozo11000002
Bambara030303211
Bobo01000001
Minianka02100003
Peulh080302417
Sarakole01010002
Sonrhai00000101
Region of Enrollment
Region of Enrollment(participants)1a - Pilot/Safety: Dosing Interval on Days: 11b - Safety/Efficacy: Dosing Interval on Days: 1, 29, 572a - Pilot/Safety: Dosing Interval on Days: 12b - Safety/Efficacy: Dosing Interval on Days: 1, 29, 573a - Pilot/Safety: Dosing Interval on Days: 14a - Safety Comparator: Dosing Interval on Days: 1, 29, 574b - Safety Comparator: Dosing Interval on Days: 1, 29, 57Total
Mali49046045436252
08

Study locations

1 site
  • Malaria Vaccine Center STTB/MRTC
    Bamako, Mali
09

References and documents

Publications

  • Bijker EM, Borrmann S, Kappe SH, Mordmuller B, Sack BK, Khan SM. Novel approaches to whole sporozoite vaccination against malaria. Vaccine. 2015 Dec 22;33(52):7462-8. doi: 10.1016/j.vaccine.2015.09.095. Epub 2015 Oct 23. PubMed 26469716 ↗
  • Mordmuller B, Surat G, Lagler H, Chakravarty S, Ishizuka AS, Lalremruata A, Gmeiner M, Campo JJ, Esen M, Ruben AJ, Held J, Calle CL, Mengue JB, Gebru T, Ibanez J, Sulyok M, James ER, Billingsley PF, Natasha KC, Manoj A, Murshedkar T, Gunasekera A, Eappen AG, Li T, Stafford RE, Li M, Felgner PL, Seder RA, Richie TL, Sim BK, Hoffman SL, Kremsner PG. Sterile protection against human malaria by chemoattenuated PfSPZ vaccine. Nature. 2017 Feb 23;542(7642):445-449. doi: 10.1038/nature21060. Epub 2017 Feb 15. PubMed 28199305 ↗
  • Roestenberg M, McCall M, Hopman J, Wiersma J, Luty AJ, van Gemert GJ, van de Vegte-Bolmer M, van Schaijk B, Teelen K, Arens T, Spaarman L, de Mast Q, Roeffen W, Snounou G, Renia L, van der Ven A, Hermsen CC, Sauerwein R. Protection against a malaria challenge by sporozoite inoculation. N Engl J Med. 2009 Jul 30;361(5):468-77. doi: 10.1056/NEJMoa0805832. PubMed 19641203 ↗

Study documents

  • Protocol and statistical analysis plan · Jan 3, 2022

Documents are hosted by the registry — open the source record to download them.

10

Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Jul 12, 2022, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
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Registry details

Key details

Study ID
NCT03952650
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
Responsible party
Sponsor
First posted
May 16, 2019
Start date
May 23, 2019
Primary completion
Feb 10, 2021
Completion
Feb 10, 2021
Results posted
Jul 12, 2022
Last update
Jul 12, 2022

Study contacts

Patrick E Duffy, M.D.
principal investigator · National Institute of Allergy and Infectious Diseases (NIAID)

Oversight

FDA-regulated drug
Yes
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

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