Active clinical trials for "Yellow Fever"

The primary objective of the study is to demonstrate the non-inferiority of the antibody response in terms of seroconversion rate 28 days after vaccine administration of one dose of yellow fever vaccine (vYF) compared to the antibody response after one dose of the YF-VAX control vaccine in yellow fever naïve participants. The secondary objectives of the study are: To describe the immune response to yellow fever in both vaccine groups before and after vYF or YF-VAX administration. To describe the safety profile of vYF vaccine in comparison to the safety profile of the control YF-VAX. To describe the biosafety profile of vYF in comparison to the biosafety profile of the control YF-VAX.

Investigating cytotoxicity of yellow fever specific CD8 T cells following YF-17D vaccination and the following licensing of these epitope-specific CD8 T cells

The study is designed as a Phase III, double-blind, multicenter, randomized, active-controlled, parallel-group design in which two groups of participants will receive either SII-YFV or STAMARIL® - a licensed and WHO pre-qualified YFV. The study will start only after the approval from the applicable ethics committees and national regulatory agencies.

This is a phase III trial on Children. The investigators will enroll a total of 750 participants in Fajikunda Health Center (Gambia) The aims of the study are To describe the safety and immunogenicity of a booster dose of a licensed yellow fever vaccine administered to 3 different age cohorts of children, following a documented primary dose of a yellow fever vaccine administered at nine-months of age. To characterise the rate of yellow-fever PRNT sero-reversion (seropositive to seronegative) over a period of 9 months to 8 years following a single primary dose of yellow fever vaccine administered to Gambian infants at nine months age. To profile the immune response to the booster dose of YF vaccine in order to explore underlying mechanisms for longevity of vaccine-induced antibody.

The objective of this study is to study immune memory generated against the yellow fever (YFV) vaccine in participants who have previously received the vaccine. Volunteers will not receive vaccine shots; only immune responses to previous yellow fever vaccination will be studied. The study involves one or multiple blood draws.

The study main objective is to assess the immune status of children and adults who have never vaccinated, they will receive the first dose of 17DD yellow fever vaccine provided by the study and will be monitored for 10 years. Depending on the results of the analyzed of the data, the period of monitoring may be extended.

Hypothesis: Infections other than HIV can cause LN inflammation and collagen damage to the fibroblastic reticular cell network (FRCn), which will lead to CD4 T cell depletion and impaired vaccine responses. This protocol will study yellow fever vaccine (YFV) in two cohorts of people, one from Uganda and the other from Minnesota where we collect lymphoid tissues (LT) and peripheral blood monocytes (PBMCs) before and after vaccination using a new technique to catalog infectious burden of the individual, determine the relationship between IA, Infections, and immune response.

This is a placebo-controlled, randomized, double-blind study to evaluate the pharmacokinetics, safety and antiviral activity of galidesivir in subjects with yellow fever (YF) or COVID-19.

The study is designed as a Phase III, double-blind, multi-center, randomized, active-controlled study in which four groups of participants (n=554 per group) will receive either one of three different manufacturing lots of SII-YFV or STAMARIL® - a licensed and WHO pre-qualified YFV.

ANRS 0146s NovaaTen study aims to determine the vaccine responses in the participants of the ANRS EP46 Novaa trial 10 years after a primary anti-yellow fever vaccination