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Initial Study of Malaria Vaccine Pfs25-EPA/Alhydrogel(Registered Trademark)

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.
ClinicalTrials.gov Identifier: NCT01434381
Recruitment Status : Completed
First Posted : September 14, 2011
Last Update Posted : February 11, 2014
Information provided by (Responsible Party):
National Institute of Allergy and Infectious Diseases (NIAID)

Brief Summary:


- The malaria vaccine Pfs25-EPA/Alhydrogel may help block malaria parasites from developing in mosquitoes. When a mosquito bites a vaccinated person, the vaccine should prevent parasites from developing in the mosquito. As a result, the mosquito will not spread malaria to the next person it bites. However, the vaccine will not directly prevent people from getting sick with malaria. Researchers want to test the safety of and response to this vaccine.


- To test the safety of the malaria vaccine Pfs25-EPA/Alhydrogel.


- Healthy volunteers between 18 and 50 years of age.


  • Participants will be screened with a medical history, physical exam, and blood tests.
  • They will be assigned to a study group to have either two or three doses of the vaccine. Participants will have checkups after each dose of vaccine,
  • The additional doses will be given 2 months or 2 and 4 months after the first vaccine.
  • Participants will have regular blood tests to check the level of the response to the vaccine.
  • They will be followed for up to 1 year after the last vaccine to have any additional tests as needed.

Condition or disease Intervention/treatment Phase
Malaria Biological: Pfs25-EPA/Alhydrogel Phase 1

Detailed Description:
A vaccine to interrupt malaria transmission would be a valuable tool for local elimination or eradication of this disease. Pfs25, a surface antigen of ookinetes in the mosquito stage of P. falciparum, is a lead candidate for a malaria transmission blocking vaccine. Recombinant Pfs25 has been conjugated to Pseudomonas aeruginosa ExoProtein A (EPA), and adjuvanted with Alhydrogel(Registered Trademark). This open label, dose escalating Phase 1 study in malaria naive adults, conducted at Johns Hopkins Bloomberg School of Public Health Center for Immunization Research (CIR) in Baltimore, Maryland, will determine initial safety and immunogenicity of the vaccine given on a 2-dose,3-dose, or 4-dose schedule. Thirty (30) volunteers will be enrolled, with 5 receiving the low dose (8 micro g of conjugated Pfs25), 5 receiving the middle dose (16 micro g of conjugated Pfs25), and 20 receiving the high dose (47 micro g of conjugated Pfs25). The high dose group will receive either 2, 3 or 4 doses of vaccine, on a 0, 2, 4 and 10 month vaccination schedule. Volunteers will be followed for 12 months following the last vaccination. Safety outcomes will be local and systemic adverse events (AEs). Immunogenicity outcomes will be antibody responses as measured by ELISA, transmission blocking in a standard membrane feeding assay, and B and T cell responses.

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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 30 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)
Primary Purpose: Prevention
Official Title: Open Label Phase 1 Study in Malaria Naive Adults of the Safety and Immunogenicity of Pfs25-EPA/Alhydrogel, a Transmission Blocking Vaccine Against Plasmodium Falciparum
Study Start Date : August 2011
Actual Primary Completion Date : August 2013
Actual Study Completion Date : August 2013

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Malaria Vaccines
Drug Information available for: Algeldrate

Arm Intervention/treatment
Experimental: Pfs25-EPA/Alhydrogel
Dose-escalation of Pfs25-EPA/Alhydrogel. Participants will receive 1 of 3 doses of Pfs25-EPA/Alhydrogel- 8 micro g, 16 micro g, or 47 micro g.
Biological: Pfs25-EPA/Alhydrogel

Primary Outcome Measures :
  1. Incidence of local and systemic adverse events [ Time Frame: All adverse events will be recorded though Day 28 after each vaccination. The frequency of systemic and local AEs will be summarized. ]
    Subjects will be monitored for 30 minutes following each immunization. Subjects will return to the clinic on Days 3,7,14 and 28 following each vaccination for clinical assessments, and periodically thereafter until completion

Secondary Outcome Measures :
  1. To determine the antibody response to the Pfs25 protein vaccines as measured by ELISA and transmission blocking assays, and the effect on antibody responses of a third dose at four months [ Time Frame: ELISA testing will occur on vaccination days, 2 weeks after each vaccination, and periodically until study completion ]

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

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Ages Eligible for Study:   18 Years to 50 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

All of the following criteria must be fulfilled for a volunteer to participate in this trial:

  • Age between 18 and 50 years.
  • Good general health as a result of review of medical history and/or clinical testing at the time of screening.
  • Available for the duration of the trial.
  • Willingness to participate in the study as evidenced by signing the informed consent document.
  • If female: subject is willing to use reliable contraception methods for the period of at least 1month (2 months for oral contraceptive pills) prior to first vaccination to 3 months after last vaccination. Reliable methods of birth control include: pharmacologic contraceptives including oral, parenteral, and transcutaneous delivery; condoms with spermicide; diaphragm with spermicide; surgical sterilization; vaginal ring; transdermal patch; intrauterine device; abstinence; and post-menopause.


A volunteer will be excluded from participating in this trial if any one of the following criteria is fulfilled:

  • Pregnancy as determined by a positive urine or serum human choriogonadotropin (Beta-hCG) test at any point during the study (if female).
  • Currently is lactating and 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 cooperate with the study protocol.
  • Neutropenia as defined by an absolute neutrophil count < 1500/mm(3).
  • Alanine transaminase (ALT) level above the laboratory-defined upper limit of normal.
  • Evidence of clinically significant neurologic, cardiac, pulmonary, hepatic, endocrine, rheumatologic, autoimmune, hematological, or renal disease by history, physical examination, and/or laboratory studies including urinalysis.
  • Other condition that in the opinion of the investigator would jeopardize the safety or rights of a participant participating in the trial or would render the subject unable to comply with the protocol.
  • History of receiving any investigational product within the past 30 days.
  • Receipt of antimalarial prophylaxis during the past 12 months, or planned travel to a destination which would require malaria prophylaxis during the period of participation.
  • Prior malaria infection by history.
  • Participant has had 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. This will be defined as:

    • Asthma that is unstable or required emergent care, urgent care, hospitalization or intubation during the past 2 years, or that requires the use of oral or parenteral corticosteroids.
    • Clinically significant reactive airway disease that does not respond to bronchodilators.
  • Positive ELISA and confirmatory Western blot tests for HIV-1.
  • Positive ELISA and confirmatory tests for hepatitis C virus (HCV).
  • Positive hepatitis B surface antigen (HBsAg) by ELISA.
  • Pre-existing autoimmune or antibody-mediated diseases including but not limited to: systemic lupus erythematosus, rheumatoid arthritis, multiple sclerosis, Sjogren's syndrome, or autoimmune thrombocytopenia.
  • Known immunodeficiency syndrome.
  • Use of chronic (greater than or equal to 14 days) oral or intravenous corticosteroids (excluding topical or nasal) at immunosuppressive doses (i.e. prednisone > 10 mg/ day) or immunosuppressive drugs within 30 days of starting this study.
  • Receipt of a live vaccine within past 4 weeks or a killed vaccine within past 2 weeks prior to entry into the study.
  • History of a surgical splenectomy.
  • Receipt of blood products within the past 6 months.
  • Previous receipt of an investigational malaria vaccine.
  • Refusal to allow storage of samples for future research.
  • Any medical, psychiatric, social, or occupational condition or other responsibility that, in the judgment of the Principal Investigator (PI), would interfere with the evaluation of study objectives.

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT01434381

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United States, Maryland
Johns Hopkins University
Baltimore, Maryland, United States, 21205
Sponsors and Collaborators
National Institute of Allergy and Infectious Diseases (NIAID)
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Principal Investigator: Patrick Duffy, MD National Institute of Allergy and Infectious Diseases (NIAID)
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Responsible Party: National Institute of Allergy and Infectious Diseases (NIAID)
ClinicalTrials.gov Identifier: NCT01434381    
Other Study ID Numbers: 11-I-N237
11-I-N237 ( Other Identifier: NIH )
CIR 276 ( Other Identifier: Center for Immunization Research, Johns Hopkins Bloomberg School of Public Health )
First Posted: September 14, 2011    Key Record Dates
Last Update Posted: February 11, 2014
Last Verified: February 2014
Keywords provided by National Institute of Allergy and Infectious Diseases (NIAID):
Additional relevant MeSH terms:
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Protozoan Infections
Parasitic Diseases
Vector Borne Diseases
Aluminum Hydroxide
Adjuvants, Immunologic
Immunologic Factors
Physiological Effects of Drugs
Molecular Mechanisms of Pharmacological Action
Gastrointestinal Agents