Tuberculosis
Conditions
Keywords
BCG, Aerosol, Tuberculosis, Challenge
Brief summary
TB041 is a clinical challenge trial primarily to evaluate the safety of BCG challenge administered by the aerosol inhaled route in healthy, BCG naive UK adults. The trial will also look to evaluate and compare the amount of BCG recovered from the lungs and from the skin, following challenge by either the aerosol or the intradermal route.
Detailed description
Mycobacterium tuberculosis (M.tb) is a pathogen found worldwide that infects humans causing tuberculosis (TB), a transmissible disease resulting in very high mortality and morbidity. It is estimated that a third of the world's population is latently infected with M.tb, and these people carry a 10% lifetime risk of developing active life-threatening disease. In 2013, there were 9 million new cases worldwide and 1.5 million people died of TB. Co-infection with human immunodeficiency virus (HIV) greatly increases risk of TB reactivation and death. TB diagnosis is challenging and drug treatment can be prolonged, harmful, costly and complex. For these reasons an effective vaccine is a global public health priority. Currently to assess vaccine efficacy against TB there is no reliable alternative to large, randomized controlled trials. These efficacy trials for novel TB vaccines are challenging, time consuming and very costly. For other diseases, such as malaria, challenge studies have been informative. The development of a safe controlled human mycobacterial challenge model which would ultimately be validated against field efficacy studies could greatly facilitate TB vaccine development by being a guide for selecting which candidate TB vaccines to take forwards to large efficacy trials. TB041 is a clinical challenge trial primarily to evaluate the safety of BCG challenge administered by the aerosol inhaled route in healthy, BCG naive UK adults. The trial will also look to evaluate and compare the amount of BCG recovered from the lungs and from the skin, following challenge by either the aerosol or the intradermal route.
Interventions
BIOLOGICALBCG
BCG SSI (Due to a global shortage of BCG SSI, BCG Bulgaria used in Group 2)
OTHERSaline placebo
Saline placebo
Sponsors
University of Birmingham
University of Oxford
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
OTHER
Masking
DOUBLE (Subject, Outcomes Assessor)
Eligibility
Sex/Gender
ALL
Age
18 Years to 50 Years
Healthy volunteers
Yes
Inclusion criteria
* Healthy adult aged 18-50 years * Resident in or near Oxford (CCVTM or OUH) or Birmingham (NIHR-WTCRF) for the = duration of the trial period * Screening IGRA negative * Chest radiograph normal * No relevant findings in medical history or on physical examination * Allow the Investigators to discuss the individual's medical history with their GP * Use effective contraception (see below) for the duration of the trial period (females only) * Refrain from blood donation during the trial * Give written informed consent * Allow the Investigator to register volunteer details with a confidential database (The - Over-volunteering Protection Service) to prevent concurrent entry into clinical studies/trials * Able and willing (in the Investigator's opinion) to comply with all the trial requirements
Exclusion criteria
* Previously resident for more than 12 months concurrently in a tropical climate where significant non-tuberculous mycobacterial exposure is likely * Participation in another research trial involving receipt of an investigational product in the 30 days preceding enrolment, or planned use during the trial period * Prior vaccination with BCG or any candidate TB vaccine * Administration of immunoglobulins and/or any blood products within the three months preceding the planned trial challenge date * Clinically significant history of skin disorder, allergy, atopy, immunodeficiency (including HIV), cancer (except BCC or CIS), cardiovascular disease, gastrointestinal disease, liver disease, renal disease, endocrine disorder, neurological illness, psychiatric disorder, drug or alcohol abuse * Concurrent oral or systemic steroid medication or the concurrent use of other immunosuppressive agents * History of anaphylaxis to vaccination or any allergy likely to be exacerbated by any component of the trial agent, sedative drugs, or any local or general anaesthetic agents * Pregnancy, lactation or intention to become pregnant during trial period Any respiratory disease, including asthma * Current smoker * Clinically significant abnormality on screening chest radiograph * Clinically significant abnormality of spirometry * Any nasal, pharyngeal, or laryngeal finding which precludes bronchoscopy * Current use of any medication taken through the nasal or inhaled route including cocaine or other recreational drugs * Clinical, radiological, or laboratory evidence of current active TB disease * Past treatment for TB disease * Any clinically significant abnormality of screening blood or urine tests * Positive HBsAg, HCV or HIV antibodies * Any other significant disease, disorder, or finding, which, in the opinion of the Investigator, may either put the volunteer at risk, affect the volunteer's ability to participate in the trial or impair interpretation of the trial data
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Adverse Events (AE) | Up to day 168 | Collection of AE data at each visit and via diary card for 28 days after challenge. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Quantification of BCG | At day 14 | Quantification of BCG in bronchoalveolar lavage (BAL) sample and intradermal biopsy sample. |
Other
| Measure | Time frame | Description |
|---|---|---|
| Identification of cellular markers of immunity | Up to day 168 | Established and exploratory markers of innate, cell mediated and humoral immunity in blood and BAL samples will be used to identify cellular markers of immunity to BCG. |
| Evaluation of aerosol BCG challenge vs intradermal BCG challenge | Up to day 168 | Laboratory markers of cell mediated and humoral immunity, including ex-vivo ELISpot in blood and intracellular cytokine staining in blood and BAL samples will be used to assess which route of challenge is most effective |
Countries
United Kingdom
Outcome results
None listed