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Sporozoite Challenge of Polyprotein Vaccinees

This study has been completed.
Sponsor:
ClinicalTrials.gov Identifier:
NCT00375128
First Posted: September 12, 2006
Last Update Posted: October 19, 2007
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.
Collaborators:
University of Oxford
Wellcome Trust
Walter Reed Army Institute of Research (WRAIR)
Information provided by:
European Malaria Vaccine Initiative
  Purpose
This study examines the ability of two new malaria vaccines (FP9-PP and MVA-PP) to prevent the development of malaria infection after controlled exposure to the parasite. Volunteers for this trial will have received these vaccines in the preceding trial VAC027.1.

Condition Intervention Phase
Malaria, Falciparum Malaria Biological: FP9-PP (FP9 polyprotein) Biological: MVA-PP (Modified Virus Ankara polyprotein) Phase 1 Phase 2

Study Type: Interventional
Study Design: Allocation: Non-Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)
Primary Purpose: Prevention
Official Title: Assessment of Protection Against Malaria by Sporozoite Challenge of Healthy Adults Vaccinated With the Polyprotein Malaria Vaccines 'FP9−PP, MVA−PP' and Control Non−Vaccinated Volunteers

Resource links provided by NLM:


Further study details as provided by European Malaria Vaccine Initiative:

Primary Outcome Measures:
  • Efficacy (time in hours to parasitaemia)

Secondary Outcome Measures:
  • Immunogenicity

Estimated Enrollment: 26
Study Start Date: September 2006
Study Completion Date: April 2007
Detailed Description:

Malaria infection kills over 2 million people each year. It is a major problem for those who live in endemic areas and for travellers. There is clearly a great need for a safe effective malaria vaccine.

The purpose of this study is to test the clinical efficacy of two candidate malaria vaccines (FP9-PP and MVA-PP). These live viral vector vaccines were administered in a 'prime boost' regime in the preceding trial VAC027.1.

Volunteers will now be exposed to 5 infective bites from mosquitoes carrying P. falciparum malaria.

This trial will:

  1. Measure efficacy as the time in hours from malaria exposure to blood film positive for malaria parasites
  2. Examine immunogenicity before and after malaria infection
  3. Measure longer term vaccine efficacy by re-challenging any protected volunteers 6 - 12 months later
  Eligibility

Information from the National Library of Medicine

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

Inclusion Criteria:

  • Healthy non-pregnant adults aged 18 to 50 years
  • The vaccinated group will be subjects who have received the vaccine regime described for group 6 or 7 in VAC027.1
  • Resident in or near Oxford, UK for the duration of the challenge study
  • For females only, willingness to practice effective contraception during the challenge study.
  • Agreement to refrain from blood donation during the course of the study
  • Written informed consent
  • Willingness to allow the investigators to access hospital and General Practitioner medical notes
  • Willingness to undergo an HIV test

Exclusion Criteria:

  • Any deviation from the protocol-defined normal range in biochemistry or haematology blood tests or in urine analysis
  • Prior receipt of an investigational malaria vaccine (unless administered in VAC027.1)
  • Use of any investigational or non-registered drug, live vaccine or medical device other than the study vaccine within 30 days preceding dosing of study vaccine, or planned use during the study period
  • Administration of chronic immunosuppressive drugs or other immune modifying drugs within six months of vaccination
  • History of malaria chemoprophylaxis with chloroquine within 5 months prior to the planned challenge, with Lariam within 6 weeks prior to the challenge, and Riamet within 2 weeks prior to the challenge
  • Any history of malaria
  • Travel to a malaria endemic country within the previous 3 months prior to the planned challenge
  • Planned travel to malarious areas during the study period
  • Any confirmed or suspected immunosuppressive or immunodeficient condition, including human immunodeficiency virus (HIV) infection and asplenia
  • Evidence of cardiovascular disease
  • History of cancer (except basal cell carcinoma of the skin and cervical carcinoma in situ)
  • History of haemoglobinopathies
  • History of diabetes mellitus
  • Chronic or active neurological disease requiring ongoing specialist supervision
  • Chronic gastrointestinal disease requiring ongoing specialist supervision
  • History of > 2 hospitalisations for invasive bacterial infections (pneumonia, meningitis)
  • Suspected or known current alcohol abuse as defined by an alcohol intake of greater than 42 units every week
  • Seropositive for hepatitis B surface antigen (HBsAg)
  • Seropositive for hepatitis C virus (antibodies to HCV)
  • Hepatomegaly, right upper quadrant abdominal pain or tenderness
  • Evidence of serious psychiatric condition
  • Any other on-going chronic illness requiring hospital specialist supervision
  • Acute disease at the time of enrolment
  • Administration of immunoglobulins and/or any blood products within the three months preceding the planned administration of the vaccine candidate
  • Pregnant or lactating female
  • Female who is willing or intends to become pregnant during the study
  • History of severe reactions or allergy to mosquito bites
  • PI assessment of lack of willingness to participate and comply with all requirements of the protocol
  • History or clinical evidence of intravenous drug abuse
  • Any other finding which in the opinion of the investigator would significantly increase the risk of having an adverse outcome from participating in this protocol
  Contacts and Locations
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): NCT00375128


Locations
United Kingdom
Imperial College, University of London
London, United Kingdom, SW7 2AZ
Centre for Clinical Vaccinology & Tropical Medicine, University of Oxford
Oxford, United Kingdom, OX3 7LJ
Sponsors and Collaborators
European Malaria Vaccine Initiative
University of Oxford
Wellcome Trust
Walter Reed Army Institute of Research (WRAIR)
Investigators
Principal Investigator: Adrian VS Hill, MA, BM BCh, DPhil, DM University of Oxford
  More Information

ClinicalTrials.gov Identifier: NCT00375128     History of Changes
Other Study ID Numbers: VAC027.2
EudraCT number: 2006-000629-67
EMVI trial identifier: PP_2_04
First Submitted: September 10, 2006
First Posted: September 12, 2006
Last Update Posted: October 19, 2007
Last Verified: October 2007

Keywords provided by European Malaria Vaccine Initiative:
Malaria
Vaccine
Prime-boost
Challenge

Additional relevant MeSH terms:
Malaria
Malaria, Falciparum
Protozoan Infections
Parasitic Diseases