Randomized, Double-Blind, Placebo-Controlled, Phase 1 Study in Healthy Volunteers to Evaluate the Safety and Immunogenicity of AGS-v, a Universal Mosquito-Borne Disease Vaccine
试验速览
- 阶段
- 1 期
- 状态
- 已完成
- 入组人数
- 49
- 试验地点
- 2
- 主要终点
- Total AGS-v Specific Immunoglobulin
研究概览
简要总结
Background:
Mosquitos carry diseases that cause major health problems and death worldwide. The AGS-v vaccine targets proteins in mosquito saliva. This may help prevent many mosquito-borne diseases. It might also reduce the lifespan of the mosquito that bites the vaccinated person.
Objective:
To see if the AGS-v vaccine is safe in humans and how it affects the immune system.
Eligibility:
Healthy adults ages 18-50
Design:
Participants will be screened another study.
Participants will be randomly assigned to get either the vaccine with a booster vaccine, the vaccine without the booster, or a placebo. These are given through a needle in the upper arm.
Participants will have visits that include medical history, physical exam, and blood and urine tests:
Baseline: They will get the vaccine and be monitored for 2 hours.
Follow-up visits 1 and 2 weeks after baseline.
Visit 3 weeks after baseline: They will get the booster and be monitored for 2 hours.
Follow-up visits 1 and 2 weeks after booster visit.
Visit 3-5 weeks after booster visit: This includes mosquito feeding. Mosquitos grown in the lab will be allowed to bite the arm. Blood will be drawn 4 times in the 3 hours after the feeding.
Phone follow-up a few days after the mosquito feeding.
After the feeding visit, 5 follow-up visits about every 2 months
Participants will keep a symptom diary for 7 days after each vaccine. They will record their temperature. They will measure any redness around the injection site. They will document and if possible photograph any mosquito bites they get.
详细描述
Mosquito-borne diseases continue to cause significant morbidity and mortality worldwide despite on-going control efforts. In 2015, there were >200 million cases of malaria worldwide, causing nearly half a million deaths, with most of the deaths occurring among children under the age of 5 years. Mosquitos also transmit arboviruses, including dengue, yellow fever, West Nile virus, chikungunya, Rift Valley fever, Japanese encephalitis, and Zika virus. The current new outbreak of Zika virus in Central and South America, as well as the Caribbean, serves as a reminder of how quickly these viruses can spread and how difficult they can be to control.
In this protocol we plan to perform a Phase I study of a novel universal mosquito-borne disease vaccine. Through modulation of the immune system after a mosquito feeding, this vaccine targets the vector saliva and may provide prophylaxis against multiple arboviral and protozoal diseases. In addition the vaccine potentially leads to a reduced mosquito lifespan after feeding therefore also reducing transmission of these diseases.
In this protocol we hope to demonstrate the safety of this vaccine similar to SEEK s other peptide based vaccines Flu-v and HIV-v that have been found to have very good safety profiles in previous Phase I trials. We also hope to demonstrate immunomodulation after a controlled clean Aedes aegypti mosquito feeding to demonstrate proof of concept efficacy of the vaccine. With the current rise of Zika in the Americas and the threat of local mosquito transmission in the U.S. and the rest of the world, a successful universal mosquito-borne disease vaccine offers the benefit of targeting this emerging disease as well as the many established infections such as dengue and malaria that make dealing with this newly emerging epidemic a challenge.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Parallel
- 主要目的
- Other
- 盲法
- Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
入排标准
- 年龄范围
- 18 Years 至 50 Years（Adult）
- 性别
- All
- 接受健康志愿者
- 是
入选标准
- 未提供
排除标准
- 未提供
结局指标
主要结局
Total AGS-v Specific Immunoglobulin
时间窗: 21 days after last vaccination
Total AGS-v specific immunoglobulin measured in serum 14 days after the first and/or second vaccination.
IL-10 Cytokine Level as Measured by Luminex
时间窗: 21 days after last vaccination
Interferon-gamma and other cytokine markers of Th1 and Th2 response measured in vitro from PBMCs incubated with AGS-v antigens as indicators of Th1 vs. Th2 response
IL-4 Cytokine Level as Measured by Luminex
时间窗: 21 days after last vaccination
Interferon-gamma and other cytokine markers of Th1 and Th2 response measured in vitro from PBMCs incubated with AGS-v antigens as indicators of Th1 vs. Th2 response
GM-CSF Cytokine Level as Measured by Luminex
时间窗: 21 days after last vaccination
Interferon-gamma and other cytokine markers of Th1 and Th2 response measured in vitro from PBMCs incubated with AGS-v antigens as indicators of Th1 vs. Th2 response
IL-2 Cytokine Level as Measured by Luminex
时间窗: 21 days after last vaccination
Interferon-gamma and other cytokine markers of Th1 and Th2 response measured in vitro from PBMCs incubated with AGS-v antigens as indicators of Th1 vs. Th2 response
IL-5 Cytokine Level as Measured by Luminex
时间窗: 21 days after last vaccination
Interferon-gamma and other cytokine markers of Th1 and Th2 response measured in vitro from PBMCs incubated with AGS-v antigens as indicators of Th1 vs. Th2 response
Interferon-gamma Cytokine Level as Measured by Luminex
时间窗: 21 days after last vaccination
Interferon-gamma and other cytokine markers of Th1 and Th2 response measured in vitro from PBMCs incubated with AGS-v antigens as indicators of Th1 vs. Th2 response
AEs Grade 3 or Higher
时间窗: 1 year after vaccination (study duration)
Grade 3 or higher adverse events identified within 1 year after 2 vaccinations 21 days apart.
Number of Subjects With 1 or More Aes
时间窗: 1 year after vaccination (study duration)
Percent of people with an AE
IL-1B Cytokine Level as Measured by Luminex
时间窗: 21 days after last vaccination
Interferon-gamma and other cytokine markers of Th1 and Th2 response measured in vitro from PBMCs incubated with AGS-v antigens as indicators of Th1 vs. Th2 response
Number of Subjects With 1 or More Grade 3 or Higher AE
时间窗: 1 year after vaccination (study duration)
Percent of people with a Grade 3 or higher AE
TNF-a Cytokine Level as Measured by Luminex
时间窗: 21 days after last vaccination
Interferon-gamma and other cytokine markers of Th1 and Th2 response measured in vitro from PBMCs incubated with AGS-v antigens as indicators of Th1 vs. Th2 response
次要结局
- IL-1B Cytokine Level as Measured by Luminex(60 days after Day 42 Mosquito Feeding)
- Number of Pupae Hatched of 100 Eggs(Day 42 Mosquito feeding)
- IL-10 Cytokine Level as Measured by Luminex(60 days after Day 42 Mosquito Feeding)
- Total AGS-v Specific Immunoglobulin(60 days after Day 42 Mosquito Feeding)
- Number of Adults Developed From 100 Eggs(Day 42 Mosquito feeding)
- Percent of Pupae That Developed Into Adults(Day 42 Mosquito feeding)
- TNF-a Cytokine Level as Measured by Luminex(60 days after Day 42 Mosquito Feeding)
- GM-CSF Cytokine Level as Measured by Luminex(60 days after Day 42 Mosquito Feeding)
- IL-4 Cytokine Level as Measured by Luminex(60 days after Day 42 Mosquito Feeding)
- Number of Eggs Laid(Day 42 Mosquito feeding)
- IL-2 Cytokine Level as Measured by Luminex(60 days after Day 42 Mosquito Feeding)
- IL-5 Cytokine Level as Measured by Luminex(60 days after Day 42 Mosquito Feeding)
- Interferon-gamma Cytokine Level as Measured by Luminex(60 days after Day 42 Mosquito Feeding)
- Percent of Eggs That Developed Into Pupae(Day 42 Mosquito feeding)