A Double Blind, Randomized, Controlled Phase Ib Field Trial in 12 to 24 Month Old Children in Tanzania to Evaluate the Safety and Immunogenicity of Candidate Malaria Vaccine MSP 3 Versus Hepatitis B Vaccine
试验速览
- 阶段
- 1 期
- 入组人数
- 45
- 试验地点
- 1
- 主要终点
- Safety of MSP3 by assessing the reactogenicity
研究概览
简要总结
This study will evaluate the safety of candidate malaria vaccine MSP3 in children aged 12-24 months in Tanzania in a highland area with low malaria transmission.
Written informed consent will be sought from all guardians/parents of potentially participating children. Eligible children will be randomly allocated to receive either the the study vaccine (MSP3 for a total of 30 children)) or the control vaccine (hepatitis B for a total of 15 children). The vaccines will be given in 3 immunizations one month apart to all the study children and neither the clinical investigators nor the children's parents will be aware of which vaccine has been administered during the initial four months of the study. The study is designed to begin with a lower dose of the MSP3 vaccine (15µg of MSP3 for 15 children) and then followed by the higher dose(30µg MSP3 for 15 children). Following each immunization, children will be evaluated for a seven day solicited symptoms. Unsolicited symptoms will also be collected throughout the study duration.
The study will be overseen by an international safety monitoring committee who will follow safety matters closely as the trial progresses. The study will also be approved by the Tanzania National ethics Committee, The Tanzania Food and Drugs Authority, and the London school of hygiene and tropical medicine ethics committee. The study is planned to last 13 months for each participant.
详细描述
The study is a double blind (observer blind, participant blind), randomized, controlled, dose escalation, Age deescalation, phase Ib study. It will include two parallel groups as follows:
- Group 1: 23 subjects (15 subjects receiving MSP3-LSP vaccine 15 µg and 8 subjects receiving Hepatitis B vaccine).
- Group 2: 22 subjects (15 subjects receiving MSP3-LSP vaccine 30 µg and 7 subjects receiving Hepatitis B vaccine).
The Immunization schedule will be 0, 1, and 2 months for all cohorts and provisionally as following for each group:
- Study days 0, 28 and 56 for group 1
- Study days 14, 42, 70 for group 2 Vaccinations of groups 1 and 2 will be staggered: immunization in group 2 will start 2 weeks after group 1. This interval may be extended if deemed necessary in case of serious adverse events or other safety concerns. Randomization will be done for each group at the time of first vaccinations and only the study pharmacist will be aware of which vaccine is allocated to a particular study ID number. The pharmacist will have no other role and will be sworn to confidentiality.
The study vaccine will be administered through the subcutaneous injection into right or left deltoid (alternately). Each child will be observed for at least 60 minutes after vaccination to evaluate and treat any acute adverse events.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Single Group
- 主要目的
- Prevention
- 盲法
- Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
入排标准
- 年龄范围
- 12 Months 至 24 Months（Child）
- 性别
- All
- 接受健康志愿者
- 是
入选标准
- •Children aged 1-2 years old
- •Healthy by medical history and physical examination
- •Signed /thumb printed informed Consent by guardian/parent
- •Resident in the study area village during the whole trial period
排除标准
- •Symptoms, physical signs of disease that could interfere with the interpretation of the trial results or compromising the health of the subjects.
- •Immunosuppressive therapy (steroids, immune modulators or immune suppressors) within 3 months prior recruitment (for corticosteroids, this means prednisolone or equivalent 0.5 mg/kg/day. Inhaled and topical steroids are allowed).
- •Cannot be followed for any social, psychological or geographical reasons.
- •Use of any investigational drug or vaccine other than the study vaccine within 30 days preceding the first dose of study vaccine, or planned use up to 30 days after the third dose.
- •Suspected or known hypersensitivity to any of the vaccine components or to previous vaccine.
- •Laboratory abnormalities on screened blood samples out of range, more specifically refer to table
- •Planned administration of a vaccine not foreseen by the study protocol within 30 days before the first dose of vaccine. An exception is the receipt of an EPI or licensed vaccine (measles, oral polio, meningococcal and combined diphtheria/pertussis/tetanus vaccines) which may be given 14 days or more before or after vaccination.
- •Evidence of chronic or active Hepatitis B infection.
- •Presence of chronic illness that, in the judgment of the investigator, would interfere with the study outcomes or pose a threat to the participant's health.
- •Administration of immunoglobulin and/or any blood products within the three months preceding the first dose of study vaccine or planned administration during the study period.
- •History of surgical splenectomy.
- •Moderate or severe malnutrition at screening defined as weight for age Z-score less than 2
结局指标
主要结局
Safety of MSP3 by assessing the reactogenicity
时间窗: Solicited and unsolicited adverse events (immediate reactogenicity within 60 minutes of each vaccination; 7-day assessment, and 28 days
次要结局
- The humoral response to vaccine antigens will be assessed by measuring by ELISA(ELISA on D0, D28, D56, D84, D168 and D365)