Evaluation of a Heterologous, Two-dose Preventive Ebola Vaccine for Effectiveness and Safety in the Democratic Republic of the Congo
试验速览
- 阶段
- 3 期
- 入组人数
- 20,426
- 试验地点
- 1
- 主要终点
- Numbers and odds of vaccination status in Ebola Virus Diseases cases and in EVD-negative controls.
研究概览
简要总结
A single arm, open-label, non-randomized, interventional phase 3 study to measure safety and effectiveness of a heterologous, two dose preventative vaccine (Ad26. ZEBOV, MVA-BN®-Filo) against Ebola Virus Disease.
详细描述
Ebola Virus Disease (EVD) is an acute, systemic, febrile syndrome caused by Ebola viruses. EVD has a case fatality ranging from 30% to 90% and spreads by direct contact with body fluids of symptomatic patients.
During the 2013-16 Ebola outbreak in Guinea, a Phase 3 cluster-randomised ring-vaccination trial using single-dose rVSV-ZEBOV-GP investigational vaccine reported 100% efficacy in protection against EVD. In 2016, the WHO Strategic Advisory Group of Experts (SAGE) on Immunization recommended the rapid deployment of rVSV-ZEBOV-GP in case of an EVD outbreak under an Expanded Access (compassionate use) protocol, with informed consent and Good Clinical Practice (GCP) compliance.
A new EVD outbreak started in North Kivu and Ituri provinces in the Democratic Republic of Congo in July 2018. Despite extensive control measures, including vaccination with rVSV-ZEBOV-GP in active outbreak areas, the outbreak has continued and WHO declared the outbreak a Public Health Emergency of International Concern on 17 July 2019. The ongoing outbreak has prompted consideration of additional vaccine candidates that might assist in preventing the spread of this infection to currently unaffected communities.
This study will investigate population-level vaccination with a two-dose prophylactic vaccine against Ebola, the Ad26.ZEBOV, MVA-BN-Filo vaccine that has been extensively studied in 11 previous safety and immunogenicity trials. This will be done by offering vaccination first to communities that neighbour the outbreak area or that are located on transport routes from the edge of the outbreak area to major centres like Goma.
In this study, approximately 500,000 healthy adults and children will be given the two-dose candidate vaccine regimen VAC52150 that consists of two vaccines, Ad26.ZEBOV and MVA-BN®-Filo, administered at an interval of 56 days (-14 day +28 day). Safety will be assessed in a safety subset of 1000 individuals and a pregnancy subset of up to 500 pregnant women will be followed to delivery. The first 100 infants born to these pregnant participants will be given a clinical examination at 3 months post-delivery. The study will estimate vaccine coverage of dose 1 and dose 2 overall and in different target groups and will also examine the knowledge and perceptions of persons eligible for large-scale delivery of a preventative Ebola vaccine with a two-dose vaccine strategy. The effectiveness of the vaccination on EVD will be determined through a test-negative case control study. The target sample size for the primary effectiveness evaluation is 110 laboratory-confirmed EVD cases.
研究设计
- 研究类型
- Interventional
- 分配方式
- Na
- 干预模型
- Single Group
- 主要目的
- Prevention
- 盲法
- None
入排标准
- 年龄范围
- 1 Year 至 —（Child, Adult, Older Adult）
- 性别
- All
- 接受健康志愿者
- 是
入选标准
- •Must provide a written or witnessed (if illiterate) informed consent form indicating that he or she understands the reasons for the study and is willing to participate in the study and be vaccinated. If less than 18 years old, must have a parent or guardian that is able to meet this criterion.
- •Must be aged 1 year or older.
- •Must be healthy in the investigator's clinical judgment as assessed on the day of vaccination.
- •Must be willing to have a photograph taken.
- •Participant must be available and willing to participate for duration of study visits and follow up.
排除标准
- •Known history of Ebola virus disease.
- •Has received any experimental Ebola vaccine less than one month prior to Visit
- •Known allergy or history of anaphylaxis or other serious adverse reactions to vaccines or vaccine products, egg and egg proteins or gentamicin.
- •Presence of acute illness (excluding minor illnesses such as mild diarrhea or mild upper respiratory tract infection) or temperature ≥38.0ºC at Visit 1 (dose 1 visit). Participants with such symptoms will be temporarily excluded from vaccination at that time but may be rescheduled for vaccination at a later date if feasible.
- •Presence of significant conditions or clinically significant findings at the vaccination visit for which, in the opinion of the investigator, vaccination would not be in the best interest of the participant.
- •History of recurrent generalized hives.
结局指标
主要结局
Numbers and odds of vaccination status in Ebola Virus Diseases cases and in EVD-negative controls.
时间窗: Through study completion, an average of 2 years.
Test negative case control study of 110 laboratory confirmed EVD cases matched to controls who test negative for EVD. Effectiveness is derived from the odds ratio for vaccination in cases compared to controls to calculate vaccine effectiveness.
次要结局
- Number and proportion of adults and children receiving dose 1.(From date of first vaccination up to month 12.)
- Number and proportion of adults and children with solicited and unsolicited serious adverse events.(From date of first vaccination to the one month post-dose 2 assessment of the last vaccinated participant.)
- Number and proportion of adults and children receiving dose 2.(From date of first vaccination up to month 12.)
- Number of participants participating in in-depth interviews and focus group discussions(Through to study completion at month 24.)