View clinical trials related to Dengue.
Filter by:This study will evaluate subjects with fever and/or rash to determine the percentage of those infected by the Zika, Chikungunya, or Dengue virus. The study will also compare the clinical signs, symptoms, and lab abnormalities related to each virus, to better specify each virus's characteristics.
Primary objectives: - To assess how dengue vaccine efficacy varies across participant subgroups regarding polymorphism in human leukocyte antigen (HLA) alleles of interest. - To assess the association between HLA alleles and, serotype-specific neutralization antibody titers and summary neutralization measure in the vaccine and placebo groups. - To assess the association between the polymorphism in HLA alleles of interest and susceptibility to Dengue fever and Dengue Haemorrhagic fever. Secondary objectives: - To assess whether dengue serotype-specific neutralizing antibody titers and associated summary neutralization measure at 28 days post-dose 3 are related to the rate of occurrence of symptomatic Virologically-confirmed dengue infection after post-dose 3 - To evaluate whether the dengue serotype-specific neutralizing antibody and associated summary neutralization measure at 28 days post-dose 3 are related to the level of vaccine efficacy against dengue viruses after post-dose 3.
The aim of the study was to assess and describe the booster effect of a tetravalent CYD dengue vaccine dose administered about 5 years or more after the completion of a 3-dose vaccination schedule in Singapore. Primary Objective: - To demonstrate the non-inferiority in terms of geometric mean of titer ratios (GMTRs) of a CYD dengue vaccine booster compared to the third CYD dengue vaccine injection in participants from CYD28 trial (participants from Group 1 only). Secondary Objectives: - If the primary objective of non-inferiority achieved: To demonstrate the superiority, in terms of GMTRs, of a CYD dengue vaccine booster compared to the third CYD dengue vaccine injection in participants from CYD28 trial (participants from Group 1 only). - To describe the immune responses elicited by the CYD dengue vaccine booster or placebo injection in participants who received three doses of the CYD dengue vaccine in the CYD28 trial in all participants. - To describe the neutralizing antibody levels of each dengue serotype Post Dose 3 (CYD28 participants) and immediately prior to booster or placebo injection in all participants. - To describe the neutralizing antibody persistence 6 months, 1 year and 2 years post booster or placebo injection in all study participants. - To evaluate the safety of booster vaccination with CYD dengue vaccine in all participants.
Background: Zika virus is mostly passed on by the bite of an infected mosquito. It usually causes mild illness. But in pregnant women it can cause serious birth defects to the baby. The virus can also spread by blood transfusion and sexual intercourse. This is why the U.S. Food & Drug Administration (FDA) recommended that people should not give blood if possibly exposed to Zika virus. Dengue virus and chikungunya virus are passed by the same mosquitoes as Zika virus. These can cause severe reactions if passed through transfused blood. Donated blood is usually not tested for these three viruses. Researchers want to count the infections in people who have been exposed because of travel or sexual exposure. They want to learn the risk these viruses might pose to the U.S. blood supply. They also want to study the natural history of these viruses by following infected people over time. Objective: To study the risk of Zika, dengue, and chikungunya viruses to the U.S. blood supply. Eligibility: Adults age 18 or older who were turned down for donating blood because of possible exposure to certain viruses. Design: Participants will have blood and urine tests. They will answer questions about their travel. They will be called in about a week with virus test results. Participants with negative results do not have any more study visits. Participants with positive results will be asked to stay in the study for 6 months. They will have weekly clinic visits and tests until results are negative for 2 straight weeks. Once test results are negative, they will have monthly visits. Visits will include physical exams, blood and urine samples, and optional semen samples from men. Most people will have 3-4 weekly visits and 5 monthly visits.
The purpose of this study is to describe the burden of DENV illness among household members aged 6 months to 50 years of selected communities in Latin America and Southeast Asia.
The main purpose of this study is to evaluate the efficacy of 2 doses of Tetravalent Dengue Vaccine Candidate (TDV) in preventing symptomatic dengue fever of any severity and due to any of the four dengue virus serotypes in 4 to 16 year old participants.
The aim of the study is to evaluate the safety and immunogenicity of the Dengue vaccine in a population of special interest, such as HIV-positive adults previously exposed to dengue. Primary Objective: - To describe the safety of each injection of CYD dengue vaccine in HIV-positive adults previously exposed to dengue. Secondary Objectives: - To describe the humoral immune response to each dengue serotype at baseline and after each injection of CYD dengue vaccine in HIV-positive adults previously exposed to dengue. - To detect the CYD dengue vaccinal viremia post-Inj 1 in HIV-positive adults previously exposed to dengue. - To describe changes in CD4 count and HIV RNA viral load after each injection of CYD dengue vaccine in HIV-positive adults previously exposed to dengue. Observational Objective: - To describe the FV (YF, Dengue, Zika) serological status in the study population at baseline.
Infection with dengue viruses is the leading cause of hospitalization and death in children in many tropical Asian countries, and the development of a dengue vaccine is a top health priority. This study will evaluate the safety and immunogenicity of a live attenuated monovalent dengue virus vaccine (rDEN3Δ30) in healthy adults with no history of previous flavivirus infection.
The purpose of this study is to evaluate the safety and immunogenicity of the recombinant live attenuated tetravalent dengue virus vaccine admixture TV005 (TetraVax-DV T005) in healthy adults, adolescents, and children in Dhaka, Bangladesh.
Rationale and Aims: Infection by dengue virus (DENV) causes major morbidity and mortality throughout the world. In 2012, an estimated 3.6 billion people live in areas at risk for DENV infection, including Singapore. The key pathology of DENV infection is vascular leakage, which can occur in mild cases and can become life-threatening in severe cases when patients may develop dengue hemorrhagic fever (DHF) or dengue shock syndrome (DSS). Mast cells (MCs) are strongly activated by DENV with preliminary studies showing that activation levels are correlated to disease severity in human patients. Thus, the investigators propose to use the MC stabilizing drug, ketotifen, to limit the immune pathology that is characteristic of dengue infection and treat dengue-induced vascular leakage. Methods: The ability of Ketotifen to reduce vascular leakage in DENV patients will be determined by assessing the pooling of fluid in the pleural cavity (measured by MRI and CXR) after 5 days of drug administration, evaluated as a percent change compared to baseline fluid levels. Additional measures of vascular leakage and immune pathology will be compared as secondary objectives. The trial will be conducted as a randomized, double-blind study comparing the responses of dengue patients given either ketotifen or placebo (n=55 per arm). Importance of proposed research: Currently, no targeted treatments exist to limit vascular leakage during DENV infection. If Ketotifen is identified as effective for preventing pleural effusion and/or plasma leakage in DENV patients, this would constitute an advance for the clinical management of DENV fever. This finding would also support a large-scale trial to determine whether Ketotifen can be used to prevent severe vascular leakage as occurs during DHF/DSS. Benefits/Risks: Ketotifen has a record of safety and tolerability in humans, regulatory approval, and widespread use. Side effects are generally mild. The potential exists that, if effective, many of the painful and life-threatening symptoms of DENV infection that result from plasma leakage would be improved.