Safety, Immunogenicity, and Impact of MVA85A, on the Immunogenicity of the EPI Vaccines

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. Identifier: NCT00480454
Recruitment Status : Completed
First Posted : May 31, 2007
Last Update Posted : February 9, 2010
Medical Research Council
Information provided by:
University of Oxford

Brief Summary:
This study is preliminary to proving that this vaccine could protect against tuberculosis in humans. Although there is no proven data to show that infants will benefit directly from participation in this study by being protected against TB, MVA85A protection of mice, guinea pigs and monkeys against tuberculosis is encouraging. It is hoped that the information gained from this study will contribute to the development of a safe and effective TB vaccine for HIV negative and positive individuals. Participants in this study will benefit by having information about their general health status, and the rigorous follow up visit that could enhance early detection and management of medical conditions that might arise in the course of the study.

Condition or disease Intervention/treatment Phase
TB Biological: MVA 85A Phase 1

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Detailed Description:

Over the last 3 years Phase I studies with MVA85A allowed for sequential vaccination of volunteer groups with a step-wise increase in mycobacterial exposure, to minimize the possibility of a Koch reaction. Trials were also conducted sequentially in the UK and The Gambia, as there is a greater degree of exposure to both environmental mycobacteria and M.tb in The Gambia. A Koch reaction describes the development of immunopathology in a person or animal with tuberculosis, when an exaggerated immune response to M.tb is stimulated. It has now been demonstrated in the mouse model of therapeutic vaccination (Taylor et al, 2003). Available animal data suggest that these reactions do not occur in mice latently infected with M.tb, suggesting that such reactions may correlate with high bacterial load and that the Koch phenomenon may not pose a problem for vaccination of healthy albeit latently infected humans (Taylor et al, 2003).

In the UK, 14 mycobacterially and BCG naïve, healthy volunteers were vaccinated twice with 5 x 107pfu MVA85A, administered intradermally at 3 week intervals. MVA85A was found to be safe and well tolerated. A single vaccination with MVA85A induced remarkably high levels of specific effector T cell responses 1 week after vaccination (mean γ IFN Elispot response to PPD was 460 spots per million PBMC). MVA85A was also safe in 17 volunteers vaccinated with BCG in the previous 0.5-37 years. The safety profile of MVA85A in these 17 volunteers was the same as in the BCG naïve group. Interestingly, these 17 volunteers showed even higher peak levels of antigen specific T cells (mean response to PPD was 917 spots per million PBMC) 1 week post-vaccination than those immunized with MVA85A alone. Perhaps more importantly for the induction of T cell memory, these volunteers who were previously BCG vaccinated maintained significantly higher levels of antigen specific T cells after MVA85A for up to 24 weeks after vaccination, when compared to those volunteers vaccinated with either BCG or MVA85A alone (McShane et al, 2004). The next trial in the UK looked at the boosting efficacy of MVA85A when administered one month after BCG vaccination. 10 healthy, BCG naïve volunteers were vaccinated with BCG and one month later were boosted with MVA85A. Safety and boosting efficacy was comparable to the previous trial where the interval between BCG and MVA85A was 0.5-37 years.

2.3.2 Gambian studies Following the success of the trials with MVA85A in the UK, a collaboration with the MRC unit in The Gambia was initiated. MVA85A was first evaluated in Phase I clinical trials in BCG naïve subjects (n = 11) and subsequently in BCG primed subjects (n=10). In these studies the safety and immunogenicity profile is comparable to that seen in the UK studies. In both the UK and The Gambian studies, MVA85A induces 5-10 fold higher immune responses than any other recombinant MVA in clinical trials. The most likely explanation for this is that the volunteers have some weak pre-existing anti-mycobacterial immunity induced by exposure to environmental mycobacteria, and this is being boosted by vaccination with MVA85A. When MVA85A is administered to BCG naïve subjects in the Gambia, the magnitude and kinetics of response resemble the BCG primed group in the UK, a finding that is likely to represent a greater degree of environmental priming in tropical climates.

Taken together, over 600 people, including HIV positive and over 250 Gambian adults and children, have now been immunised with various recombinant MVA investigational vaccines including constructs expressing malaria, HIV, hepatitis B and melanoma antigens without significant adverse reactions (Hill, unpublished data). Furthermore, 190 children aged 1-5 years were vaccinated with a recombinant MVA expressing a malarial antigen in 2006, with no vaccine related SAEs (Hill, personal communication). This safety data now allows for progression to testing MVA85A in a phase II study in infants who have been vaccinated with BCG, in a Gambian population which may include low numbers of latently M.tb infected and HIV positive children.

It is important to test the safety, immunogenicity, and possible interference (detrimental, none or beneficial) with other EPI vaccines of the MVA85A vaccine in such a group, which is one of the potential target populations for a large-scale efficacy study. Also the effects of simultaneous EPI vaccine administration on the immunogenicity of MVA85A need to be evaluated.

Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 214 participants
Allocation: Randomized
Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Prevention
Official Title: An Open Randomized Dose Selection Study Evaluating the Safety, Immunogenicity, and Impact of a TB Vaccine, MVA85A, on the Immunogenicity of EPI Vaccines Administered Simultaneously to Healthy Infants Previously Vaccinated With BCG.
Study Start Date : October 2006
Actual Primary Completion Date : December 2009
Actual Study Completion Date : December 2009

Resource links provided by the National Library of Medicine

Arm Intervention/treatment
Active Comparator: 1
Stage 1 would require 12 per group low dose and 12 per group high dose (total 72)
Biological: MVA 85A
intradermal vaccine
Other Names:
  • TB vaccine
  • modified vaccinia virus Ankara

Active Comparator: 2
Stage 2 would require 48 per group (total 144)
Biological: MVA 85A
intradermal vaccine
Other Names:
  • TB vaccine
  • modified vaccinia virus Ankara

Primary Outcome Measures :
  1. Dose selection, safety and immunogenicity of MVA85A vaccines in 4 month old healthy Gambian infants [ Time Frame: one year ]

Secondary Outcome Measures :
  1. Impact of MVA85A on the immunogenicity of EPI vaccines (DTwPHib, Hep B) and vice versa when administered simultaneously to children who have had BCG vaccine within the first two weeks of life. [ Time Frame: One year ]

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Ages Eligible for Study:   2 Months to 3 Months   (Child)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Healthy infants aged 2 - 3 months
  • Recorded BCG vaccination within first two weeks of life with typical BCG scar on the left arm
  • Receiving standard EPI immunizations according to national immunization programme (DTwPHib at 2/3/4 months, OPV at birth, 1, 2 and 3 months, Hep B at birth, 2 & 4 months)
  • Written informed consent by parent / guardian

Exclusion Criteria:

  • Any clinically significant abnormal finding on screening from biochemistry or haematology
  • Any AIDS defining illness
  • Prior receipt of a recombinant MVA or Fowlpox vaccine, or other experimental vaccine
  • Use of any investigational or non-registered drug, live vaccine or medical device other than the study vaccine within 2 weeks preceding dosing of study vaccine, or planned use during the study period
  • Administration of chronic (defined as more than 14 days) immunosuppressive drugs or other immune modifying drugs within 6 months of vaccination. (For corticosteroids, this will mean prednisolone, or equivalent, ≥ 0.5 mg/kg/day. Inhaled and topical steroids are allowed.)
  • History of allergic disease or reactions likely to be exacerbated by any component of the vaccine, e.g. egg products
  • Presence of any underlying disease that compromises the diagnosis and evaluation of response to the vaccine
  • History of > 2 hospitalisations for invasive bacterial infections (pneumonia, meningitis)
  • Any other on-going chronic illness requiring hospital specialist supervision
  • Administration of immunoglobulins and/or any blood products within one month preceding the planned administration of the vaccine candidate
  • Any history of anaphylaxis in reaction to vaccination
  • Research Physician's assessment of lack of willingness by parents to participate and comply with all requirements of the protocol, or identification of any factor felt to significantly increase the infant's risk of suffering an adverse outcome
  • Likelihood of travel away from the study area
  • Untreated malaria infection

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 identifier (NCT number): NCT00480454

Banjul, Gambia
Sponsors and Collaborators
University of Oxford
Medical Research Council
Principal Investigator: Helen McShane University of Oxford

Responsible Party: Dr Helen McShane, University of Oxford Identifier: NCT00480454     History of Changes
Other Study ID Numbers: TB012
First Posted: May 31, 2007    Key Record Dates
Last Update Posted: February 9, 2010
Last Verified: February 2010

Keywords provided by University of Oxford:

Additional relevant MeSH terms:
Immunologic Factors
Physiological Effects of Drugs