Active clinical trials for "Typhoid Fever"

This is a multicenter, randomized, observer-blinded, controlled, immune equivalence study of a multi-dose (MD) formulation with 2PE preservative of SK bioscience Vi-DT compared to single dose (SD) formulation without preservative of SK bioscience Vi-DT in participant (6 months - 45 years) including safety population. The study objectives are as follows: Primary objective. Demonstrate the immune equivalence as measured by anti-Vi IgG Geometric Mean Titer (GMT) of multi dose formulation against single dose formulation of Vi-DT (18-45 year age stratum), at 4 weeks after a single dose. Secondary objective 1. Demonstrate the immune equivalence as measured by seroconversion rates of anti-Vi IgG antibody titres of multi dose formulation against single dose formulation of Vi-DT vaccine (18-45 year age stratum) at 4 weeks after a single dose. Secondary objective 2. Describe safety profile in all age strata combined (age 6 months - 45 years old) and in each age stratum, at 4 weeks after a single dose of SD/MD formulation/control (Meningococcal Conjugate Vaccine). There are total 5 scheduled visits as follows: Visit 1(D-7 to 0): Screening Visit 2(D0): Enrollment, vaccination, safety follow-up and blood collection for immunogenicity assessment (only for subjects 18 years old and above) Visit 3(D7): Safety follow-up Visit 4(D28): Safety follow-up and blood collection for immunogenicity assessment (only for subjects 18 years old and above) V5(D168): Safety follow-up

Using an established model of human typhoid infection, whereby healthy adults are deliberately infected with typhoid-causing bacteria, the investigators will determine how effective a new oral typhoid vaccine (M01ZH09) is in preventing infection. A previously licensed oral typhoid vaccine (Ty21a) will be used to make sure the challenge model used works properly.

The purpose of this research study is to determine whether a new vaccine for typhoid fever is safe and effective. This study will also look at what effects (good and bad) this new vaccine, Ty800, has on the volunteers. The study will determine the highest dose of Ty800 that can be given without causing severe side effects. About 54 healthy males and females, ages 18-45 inclusive, in the Cincinnati metropolitan area will be enrolled in this study. They will be in the study for approximately 7 months, which includes a one month screening period, study product administration on Day 0, a 10-day hospital stay, an outpatient period on Days 9-28 with 4 follow-up visits, and safety follow-up phone calls at 2 and 6 months after hospital discharge. Researchers hope that this trial will help produce a vaccine that combines a high level of durable protective immunity with simplicity of administration and minimal reaction to the vaccine.

This study is to assess the safety of Vi-DT vaccine in adults and children.

The purpose of this research study is to see if giving a typhoid vaccine by mouth (an experimental vaccine, CVD 909) before giving a vaccine shot (Typhim Vi) will result in a better immune response than giving Typhim Vi vaccine by itself. Another purpose is to see whether CVD 909 is safe. Typhim Vi has been shown to be safe and effective in preventing typhoid fever in older children and adults, but it does not work in children under age 2. Scientists at the University of Maryland think that young children could respond to Typhim Vi if they were given a dose of the other typhoid vaccine by mouth before they are given the Typhim Vi shot. Twenty-eight healthy adult volunteers, ages 18-40 years, will take part in this study. Study participation will last for up to 63 weeks, but most of the study visits will be in the first 6 weeks. Blood samples will be collected approximately 13 times. Four stool samples will be collected. Some volunteers may be followed for an additional 4 years.

This study is part of the International Vaccine Institute's (IVI's) typhoid Vi demonstration project that aims to accelerate the rational introduction of Vi vaccines in typhoid endemic countries. The purpose of this study is to determine the effectiveness of the Vi vaccine following a mass typhoid immunization campaign in an endemic area in Kolkata, India. The cost-effectiveness of the Vi vaccination and the logistic feasibility of a mass typhoid immunization campaign will also be evaluated.

Typhoid fever is an illness that may cause mild effects in children, such as fever and feeling tired, or it may cause serious effects-- even death. A new typhoid vaccine has recently been recommended by the World Health Organization (WHO) to prevent typhoid in children. But this new typhoid vaccine has not been tested with all of the vaccines given to children in Burkina Faso. The investigators want to look at this new vaccine, and study how safe it is in children in Burkina Faso and how their immune systems respond to the vaccine when given with other vaccines, such as yellow fever and meningitis A vaccines. The investigators plan to vaccinate 100 children between the ages of 9-11 months, and 150 children between the ages of 15 months and 2 years, in Ouagadougou, Burkina Faso, with either the typhoid vaccine or a vaccine against another illness called polio. Children will have follow-up visits on days 3, 7, 28 and 180. One teaspoon of blood will be collected on days 0 and 28.

This was a randomized, double-blind, ascending dose study conducted at a single clinical research center.

Tropical fevers have been a diagnostic challenge from the antiquity. Nowadays, despite the availability of good diagnostic capacities, undifferentiated febrile illnesses continue to be a thorny problem for travel physicians. In developing countries, the scarcity of skilled personnel and adequate laboratory facilities makes the differential diagnosis of fevers even more complex. Health care workers must often rely on syndrome-oriented empirical approaches to treatment and might overestimate or underestimate the likelihood of certain diseases. For instance Neglected Tropical Diseases (NTD) contribute substantially to the burden of persistent (more than 1 week) fevers in the Tropics, causing considerable mortality and major disability. These diseases are however rarely diagnosed at primary health care (PHC) level. The difficulty in establishing the cause of febrile illnesses has resulted in omission or delays in treatment, irrational prescriptions with polytherapy, increasing cost and development of drug resistance. In resource-limited settings, clinical algorithms constitute a valuable aid to health workers, as they facilitate the therapeutic decision in the absence of good laboratory capacities. There is a critical lack of appropriate diagnostic tools to guide treatment of NTDs. While clinical algorithms have been developed for some NTDs, in most cases they remain empirical. Besides, they rarely take into account local prevalence data, do not adequately represent the spectrum of patients and differential diagnosis at the primary care level and often have not been properly validated. The purpose of the study is to develop evidence-based Rapid Diagnostic Test (RDT)-supported diagnostic guidelines for patients with persistent fever (≥ 1 week) in the Democratic Republic of the Congo (DRC), Sudan, Cambodia and Nepal.

This study compares the safety and immunogenicity profile of several travel vaccines given alone or concomitantly with MenACWY-CRM to healthy adults.