Active clinical trials for "Influenza, Human"

The primary purpose of this study is to demonstrate the efficacy of an investigational Vero-cell derived influenza vaccine to prevent infection in an adult population with an influenza virus that is antigenically similar to one of the three strains in the vaccine. All subjects will be randomized to receive a single 0.5 ml intramuscular injection from one of three lots of seasonal Vero-cell derived influenza vaccine or saline placebo. Subjects will be monitored for 180 days following vaccination for occurrence of adverse events. For determining antibody response, subjects will have one blood draw before and one blood draw 21 days after vaccination.

Influenza pandemics are caused by viruses that possess an Hemagglutinin molecule to which most of the population lacks immunity. If such virus is pathogenic to human and demonstrates the ability to transmit from person to person, the result is a global outbreak of disease that affects a high percentage of individuals in a short period of time and is likely to cause substantially increased mortality and morbidity in all countries of the world. Recently, purely avian influenza viruses, including the H5N1, H9N2 and H7N7 subtypes, have been directly transmitted to humans, raising concern over the possibility of a new influenza pandemic among the world's immunologically naive populations. In order to face this kind of situation, a pandemic influenza vaccine has to be developed.

Vaccination is currently the most effective means of controlling influenza and preventing its complications and mortality in persons at risk. Once a year, a meeting of World Health Organization (WHO) experts takes place, leading to a recommendation on the influenza A and B strains that should be used for the production of vaccine for the coming influenza season. For the strains which do not change from the previous year, the vaccine can be formulated from the old mono bulk from the previous year. Bulks as old as 12 months may be blended to make trivalent inactivated vaccine (TIV) under the current Canadian and US licenses. This study is conducted to evaluate safety and immunogenicity of Fluviral vaccines made with the aged bulk material compared with the new bulk material. This protocol posting has been updated in order to comply with the FDA Amendment Act, Sept 2007.

To evaluate the antibody response to each influenza vaccine antigen when administering a single dose to subjects aged 65 years and over

Annual trial for registration of trivalent split influenza vaccine with the strain composition of the season 2007/2008 in healthy adult and elderly subjects

Due to antigenic changes of influenza viruses, the virus strains used in influenza vaccines are adjusted every year according to WHO (World Health Organization) and CHMP (Committee for Medicinal Products for Human Use) recommendations. Immunogenicity and tolerability of the newly composed vaccines are subject for evaluation in a yearly clinical trial in non-elderly and elderly subjects (CPMP/BWP/214/96).

The purpose of this study is to evaluate the immunogenicity and the safety of candidate vaccines compared to Fluarix™ administered intramuscularly in subjects aged 18-59 years

The purpose of this study is to see how antibodies (proteins that fight infection) are made after you receive the new H5N1 flu vaccine. The new H5N1 vaccine will be given to 50 healthy adult lab workers, aged 18 years and older. Subjects will receive two 90mcg injections (shots in the arm) of the vaccine about 1 month apart. Subjects will maintain a memory aid to record oral temperature and any response to the vaccine for 7 days after each immunization. Subjects will be contacted by telephone 1 to 3 days after vaccination. They will return to the clinic on Day 7. Blood will be drawn before each vaccination and on Days 56 and 180. Subjects may be involved in the study for about 6 months. It is anticipated that the vaccine will provide safe protection against influenza H5N1.

The purpose of this study is to evaluate safety and immunogenicity of a single intramuscular (IM) injection of a Surface Antigen, Inactivated, Influenza Vaccine, Formulation 2005-2006, when Administered to Non-Elderly Adults and Elderly Subjects

The World Health Organisation has warned that an influenza pandemic is inevitable. The avian influenza strain H5N1 is one of the leading candidates to cause the next influenza pandemic. Children are likely to be a special target group for vaccination; therefore, this study will test the safety and immunogenicity of an H5N1 pandemic influenza vaccine in healthy children.