Active clinical trials for "Influenza, Human"

The purpose of this study is to demonstrate the efficacy of an investigational Vero cell-derived, trivalent, seasonal influenza vaccine to prevent infection with an influenza virus that is antigenically similar to one of the three strains in the vaccine. Subjects will be randomized in a double-blind fashion to receive a single intramuscular injection of either the investigational vaccine or placebo. Blood will be drawn from all subjects for a determination of hemagglutination inhibition antibody titers on Days 0 and 21, body temperature and injection site reactions will be monitored daily for 7 days. In addition, subjects must return to the clinic promptly to have swab samples of their nose and throat taken whenever they feel flu symptoms and all subjects will be monitored for adverse events until Day 180.

This is a single blind, reference drug controlled, one center viral immunogenicity and tolerability study of FluvalAB FL-K-004 Trivalent Influenza Vaccine with 6 μg HA/strain/dos antigen content to assess immunogenicity and tolerability. The aim of the study is to assess the immunogenicity and tolerability of FluvalAB FL-K-004 trivalent influenza vaccine with 6 μg HA/strain/dos antigen content (study drug) in age groups 18-60 years and over 60 years, with the objective to verify efficacy and tolerability of the study drug according to CPMP/BWP/214/96: "Note for Guidance on Harmonization of Requirements for Influenza Vaccines", 12 March 1997.

The purpose of this observer-blind clinical trial is to evaluate the safety and immunogenicity of GlaxoSmithKline Biologicals' influenza vaccine GSK2186877A in the elderly. Subjects were previously vaccinated (NCT00529516).

Study Design: This is a Phase I, randomized, open-label study to evaluate the safety, tolerability, and immunogenicity of four vaccination regimens against the influenza virus hemagglutinin H5. One group will receive A/Indonesia/05/2005 (inactivated H5N1) vaccine as both prime and boost, two groups will receive the VRC-AVIDNA036-00-VP (DNA) vaccine as prime with inactivated H5N1 boost but with different boost intervals, and one group will receive the DNA vaccine twice as prime followed by H5N1 boost. The hypothesis is that these regimens will be safe for human administration and will elicit antibody and T cell responses against the H5 protein. The primary objectives are to evaluate the safety and tolerability of the investigational vaccine regimens, at a dose of 4 mg for the DNA vaccine and 90 microgram for the inactivated H5N1, in healthy adults. Secondary and exploratory objectives are related to the immunogenicity of the study vaccine regimens. Product Description: The inactivated H5N1 vaccine is monovalent subunit virion vaccine, A/Indonesia/05/2005 clade 2, manufactured by Sanofi Pasteur, Inc (Swiftwater, PA). Vaccine vials will be supplied at 90 microgram/0.5mL. The VRC-AVIDNA036-00-VP vaccine was developed and manufactured by VRC, NIAID and is composed of a single closed-circular DNA plasmid that encodes the H5 protein with a CMV/R promoter. Vaccine vials will be supplied at 4 mg/mL. Each vaccination will be administered intramuscularly (IM) in the deltoid muscle using needle and syringe for the H5N1 vaccine and the Biojector (Trademark) 2000 Needle-Free Injection Management System (Biojector) for the DNA vaccine. Subjects: A total of 60 healthy adults, ages 18-60 years will be enrolled. Study Plan: Subjects will be simultaneously randomized at a ratio of 1:1:1:1 into one of four groups. Subjects and clinicians will be blinded to group assignment until Day 0 following completion of the enrollment. At the point of enrollment the randomly assigned regimen will become known to subjects and clinicians. Subjects will receive either two or three injections on the schedule shown in the schema. The protocol requires five clinic visits and two telephone follow-up contacts for Groups 1, 2, and 3, and six clinic visits and three telephone follow-up contacts for Group 4.

The study is to compare the 2 Groups with respect to antibody responses to inactivated influenza vaccine. Observational Objectives: To describe the percentage of participants with protective Hemagglutinin (HAI) antibody titers to each of the 3 vaccine antigens in both study groups following each vaccination. To describe the HAI geometric mean titer (GMTs) to each of the 3 vaccine antigens in both study groups following each vaccination. To describe the safety of the 2005-2006 pediatric formulation of Fluzone® vaccine in both study groups.

A single center, stratified, randomized and double-blind phase II clinical trial was conducted in adolescents to evaluate the safety and immunogenicity of a split-virion pandemic influenza A vaccine (H5N1).

This observer-blind study is designed to show the immunological non-inferiority of Thiomersal-free-processed pandemic influenza vaccine as compared to the Thiomersal-containing-processed pandemic influenza vaccine.

The purpose of this study is to evaluate the effects of catechin extracts containing mask on prevention of influenza infection.

Influenza viral infection can cause serious illness among young infants 0-6 months of age. However, inactivated influenza vaccine is not recommended for this age group but pregnant women can be vaccinated during 2nd - 3rd trimester to induce passive immunization of their infants. Nevertheless vitamin A deficiency is highly prevalent among pregnant women in Bangladesh, >50% pregnant women consume less vitamin A than the recommended level. Given the fact that both clinical and sub-clinical vitamin A deficiency impair vaccine specific immunity, in this proposed study, we aim to investigate whether maternal vitamin A supplementation improve influenza vaccine specific immune responses among pregnant women and the passive protection of their infants. In a placebo controlled clinical trial, sixty six mothers will be randomly assigned to receive either 10,000 IU vitamin A or placebo capsules weekly from second trimester to 6 month postnatal period. At 26-28 weeks of gestation, all mothers will be vaccinated with inactivated, trivalent influenza virus vaccine. Maternal and cord blood will be collected for vitamin A and influenza virus specific IgG assessment. Colostrum and breast milk at 6-month will be collected for vitamin A and influenza virus specific secretory IgA assessment. Venous blood (2-3 ml) will be obtained from all infants at the age of 6 months for vitamin A and influenza virus specific IgG assessment as well as infants' nasal swab for influenza virus specific secretory IgA.

A Phase 2a Randomized, Double Blind, Placebo Controlled Trial to Evaluate the Safety and Immunogenicity of a Seasonal Influenza Virus-Like Particle (VLP) Vaccine (recombinant) in Healthy Adults. Study Objectives: Primary: To assess the tolerability and safety of Influenza VLP Vaccine To assess the immunogenicity of Influenza VLP Vaccine as measured by hemagglutination inhibition (HAI) antibody titers to each of the three component viral strains Secondary: To evaluate the cross-strain immunogenicity of Influenza VLP Vaccine as measured by hemagglutination inhibition (HAI) antibody titers against drifted strains To quantify antibody against neuraminidase and hemagglutinin following administration of Influenza VLP Vaccine To assess cell-mediated immune (CMI) responses to Influenza VLP Vaccine as quantified by interferon-gamma (IFNg) and Granzyme-B produced by peripheral blood mononuclear cells (PBMCs).