Active clinical trials for "Dengue"

The purpose of this study is to detect acute febrile episodes and dengue infection in five Asian countries, to assess dengue seroprevalence, and to assess surveillance infrastructure at investigational sites in anticipation of a Phase 3 efficacy trial of a vaccine to prevent dengue infection. The primary objectives are: To identify acute febrile episodes among the cohort in order to detect the presence of dengue infection. To develop operational infrastructure for potential Phase III dengue efficacy trial sites. To describe the dengue seroprevalence among the cohort at baseline and at the end of the study.

This is a phase II step-wise, randomized, multicenter, double-blind and controlled clinical trial to evaluate the safety and immunogenicity of a attenuated tetravalent lyophilized dengue vaccine manufactured by Butantan Institute. Three Clinical Sites at University of Sao Paulo - Brazil will participate in the study. A total of 300 volunteers will be recruited and divided into two steps: Step A (with no previous exposure to dengue) and Step B (with and without previous exposure to dengue). In step A the participants will be assigned to receive either the lyophilized vaccine, or the liquid vaccine(developed at NIH and produced and formulated at Butantan according to the NIH-Protocol), or the placebo. In Step B participants will be assigned to receive either the lyophilized vaccine, or the placebo. Both vaccine formulations (lyophilized and liquid) are composed of the same attenuated viruses: rDEN1∆30, rDEN2/4∆30(ME), rDEN3∆30/31, and rDEN4∆30. At the end of the study, 20 volunteers will have received the liquid formulation (NIH), 210 the lyophilized formulation (Butantan), and 70 will have received the placebo. All participants included in both steps will be followed by a period of five years after their inclusion in the study. The study hypothesis is that the investigational lyophilized dengue vaccine manufactured by Butantan Institute is safe and confers balanced immune response, after one dose of 1000PFU, to all for vaccine viruses.

The purpose of this study is determine the ability of bedide ultrasound performed in the Emergency Department and Outpatient Department can predict the severity of disease during a Dengue Fever outbreak in children, in Siem Reap, Cambodia. Our hypothesis is that the presence of gallbladder wall thickening and/or pleural effusions in children correlates with progression to Dengue hemorrhagic fever and Dengue shock. In addition, we hypothesize that sonographic imaging of pediatric patients presenting to the emergency department with a fever during a Dengue fever outbreak will change management and disposition.

To test whether Karius Infectious Disease Diagnostic Sequencing assay can detect Dengue Virus in plasma from suspected cases of Dengue or Dengue Fever like-illnesses from samples collected as part of a hospital-based multi-site study conducted in Nepal.

Dengue virus serological reagent, included antigen and antiserum, is a serum test for identification of serum antibodies to dengue virus.

Dengue is an infectious disease most prevalent in the world. This disease is endemic in the Caribbean, with an increase in seasonal rains. Several outbreaks have been observed in recent years, in 2001, 2005 and 2007, during which further particularly virulent serotypes have emerged. The clinical expression of dengue fever is variable, ranging from no symptoms to a classical form with fever, and even of severe or lethal bleeding. With the possible existence of silent forms of the disease, there are no data identifying the current level of protection of the population in Martinique / Guadeloupe.

The purpose of this study is to detect acute febrile episodes and dengue infection in five Latin American countries to assess dengue seroprevalence. Primary objectives: To identify acute febrile episodes among the cohort in order to detect the presence of dengue infection. To describe the dengue seroprevalence among the cohort at baseline and at the end of the study.

Background: Zika, dengue, and chikungunya are spread by mosquitos. These diseases have a major impact on public health. This is especially true in in Southeast Asia. Non-human primates (such as macaques) could play an essential role in spreading these diseases. Researchers want to further understand the relationship between humans and these primates. They want to see how this affects how mosquito-borne viruses are spread in Southeast Asia. Objective: To describe the prevalence of Zika virus, dengue virus, and chikungunya virus in the blood of people who live close to long-tailed macaques in Thailand and Cambodia. Eligibility: Healthy people aged 18-55 who have lived or worked within approximately 10 kilometers of the Wat Amphae Phnom monkey habitat in Kampong Speu, Cambodia, for a minimum of 2 years Design: Participation will last 1 day. Participants will be screened in person through an interview. Their medical history will be reviewed. Participants will give information about themselves. This will include sex, age, and behaviors related to the spread of mosquito-borne disease. For example, they will be asked about the number of water containers at their home. They will be asked about recent travel. They will be asked about the extent of their contact with the macaques. Participants will give a blood sample....

Evaluate the prognostic value of different methods (Osmometry / clinical-biological score) compared to the occurrence of capillary leak shock during dengue fever.

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.