Crohn Disease, Mycobacterium Avium Subspecies Paratuberculosis
Conditions
Keywords
Vaccine, MAP
Brief summary
A phase I dose escalation study to assess the safety and immunogenicity of the candidate vaccines ChAdOx2 HAV and MVA HAV in healthy volunteers. Volunteers will be recruited and vaccinated in Oxford, England. All vaccinations will be administered intramuscularly. Three different doses of the ChAdOx2 HAV will be tested (5x10\^9 vp, 2.5x10\^10 vp and 5x10\^10vp). MVA HAV will be assessed at 2 different doses (5x10\^7 and 2x10\^8 pfu) The total duration of the study will be 52 weeks from the day of enrolment for volunteers receiving ChAdOx2 HAV only, 12 weeks for volunteers receiving MVA HAV only and 20 weeks for volunteers receiving ChAdOx2 HAV and MVA HAV.
Detailed description
This is a phase I, open label, dose escalation trial to assess the safety and immunogenicity of the ChAdOx2 and MVA HAV vaccines against Mycobacterium avium subspecies paratuberculosis (MAP) in healthy volunteers There will be 5 study groups with a total of 28 volunteers. ChAdOx2 HAV will be administered intramuscularly as a single vaccination at 3 different doses: 5x10\^9 vp (group 1), 2.5x10\^10 (group 2) and 5x10\^10 vp (group 3) and as a prime vaccine in group 6 (prime/boost group). MVA HAV will be administered intramuscularly as a single vaccination at 2 different doses: 5x10\^7 pfu (group 4), 2x10\^8 pfu (group 5) and as a boost vaccine in group 6 (prime/boost group) Vaccination of groups will be sequential from Group 1 to Group 6 with interim safety reviews prior to dose escalation Volunteers will be recruited and undergo screening visits, vaccination and clinic visits post-vaccination at the trial site. Blood samples for safety and immunology purposes will be performed on the visit time points indicated in the schedule of attendances. Safety will be assessed by the frequency, incidence and nature of adverse events and serious adverse events arising during the study.
Interventions
BIOLOGICALChAdOx2 HAV
The ChAdOx2 HAV vaccine consists of the replication-deficient simian adenovirus vector ChAdOx2, containing the Mycobacterium avium subspecies paratuberculosis (MAP) antigens
BIOLOGICALMVA HAV
The MVA HAV vaccine consists of the replication deficient modified vaccinia virus Ankara (MVA) containing the Mycobacterium avium subspecies paratuberculosis (MAP) antigens.
Sponsors
University of Oxford
Study design
Allocation
NON_RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
NONE
Eligibility
Sex/Gender
ALL
Age
18 Years to 50 Years
Healthy volunteers
Yes
Inclusion criteria
1. Healthy adults aged 18 to 50 years 2. Able and willing (in the Investigator's opinion) to comply with all study requirements 3. Willing to allow the investigators to discuss the volunteer's medical history with their General Practitioner 4. For females only, willingness to practice continuous effective contraception (see below) during the study and a negative pregnancy test on the day(s) of screening and vaccination 5. Agreement to refrain from blood donation during the course of the study 6. Provide written informed consent
Exclusion criteria
1. Participation in another research study involving receipt of an investigational product in the 30 days preceding enrolment, or planned use during the study period 2. Prior receipt of an investigational vaccine likely to impact on interpretation of the trial data. 3. Prior receipt of an adenoviral vectored vaccine in the last 12 months 4. Administration of immunoglobulins and/or any blood products within the three months preceding the planned administration of the vaccine candidate 5. Any confirmed or suspected immunosuppressive or immunodeficient state, including HIV infection; asplenia; recurrent, severe infections and chronic (more than 14 days) immunosuppressant medication within the past 6 months (inhaled and topical steroids are allowed) 6. History of allergic disease or reactions likely to be exacerbated by any component of the vaccine 7. Any history of hereditary angioedema, acquired angioedema, or idiopathic angioedema. 8. Any history of anaphylaxis in relation to vaccination 9. Pregnancy, lactation or willingness/intention to become pregnant during the study 10. History of cancer (except basal cell carcinoma of the skin and cervical carcinoma in situ) 11. History of serious psychiatric condition likely to affect participation in the study 12. Bleeding disorder (eg. Factor deficiency, coagulopathy or platelet disorder), or prior history of significant bleeding or bruising following IM injections or venepuncture 13. Any other serious chronic illness requiring hospital specialist supervision 14. Suspected or known current alcohol abuse as defined by an alcohol intake of greater than 42 units every week 15. Suspected or known injecting drug abuse in the 5 years preceding enrolment 16. Seropositive for hepatitis C (antibodies to HCV) 17. Seropositive for hepatitis B surface antigen(HBsAg) 18. Any clinically significant abnormal finding on screening biochemistry or haematology blood tests or urinalysis 19. Any other significant disease, disorder or finding which may significantly increase the risk to the volunteer because of participation in the study, affect the ability of the volunteer to participate in the study or impair interpretation of the study data 20. Inability of the study team to contact the volunteer's GP to confirm medical history and safety to participate.
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Occurrence of solicited and unsolicited local and systemic adverse events | up to 28 days following vaccination | The specific endpoints for safety and reactogenicity will be actively and passively collected data on adverse events. Change from baseline for safety laboratory measures will also be collected. Occurrence of serious adverse events will be collected during the whole study duration |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Measures of Immunogenicity of ChAdOx2 HAV and MVA HAV | Approximately 2 months post each vaccination | To assess the immunogenicity of ChAdOx2 HAV and MVA HAV in healthy adult volunteers when administered alone and in a prime-boost regimen |
Countries
United Kingdom
Outcome results
None listed