Comparison of Flu Vaccine Doses in Children

2014-08-27 03:12:09 | BioPortfolio


The purpose of this study is to evaluate the possibility that giving an increased dose of flu vaccine to children 6 through 35 months of age will improve protection against influenza without increasing side effects. Investigators will evaluate the body's response to the vaccine. Male and female participants' ages 6-35 months, who have never received flu vaccine, and those ages 12-35 months, who have been previously vaccinated, will participate in the study for about 7 months. Vaccine naïve study participants will receive two doses of flu vaccine, either the 0.25 mL dose (Group 1) or 0.5 mL dose (Group 2). Previously vaccinated subjects will receive one dose of flu vaccine, either the 0.25 mL dose (Group 1) or 0.5 mL dose (Group 2). Study procedures include physical examination, memory aids, blood sampling and a follow-up phone call about 6 months after the last vaccine dose.


Influenza is an important cause of morbidity and mortality among both children and adults. Influenza A and/or B viruses cause yearly epidemics in the United States with an average of 36,000 deaths and 114,000 hospitalizations annually. Children have the highest rates of infection. Influenza is also associated with substantial numbers of hospitalizations among young infants. Because of the limited data available and the variability of reported seroresponses to doses of 0.25 ml in children 6-35 months of age, investigators hypothesize that a higher dose will be more consistently immunogenic. In addition, since currently licensed trivalent inactivated influenza (TIV) vaccines are well tolerated with minimal systemic and local adverse events, investigators hypothesize that administering a higher dose of 0.5 ml to this age group will be well-tolerated. Therefore, investigators propose to compare the safety and immunogenicity of 0.25 ml doses of TIV to that of 0.5 ml doses of TIV when administered to children 6-35 months of age. The proposed study is a phase I, two-arm, 1:2 randomized, double-blinded trial comparing the safety and immunogenicity of increased dose(s) (0.5 ml) with standard dose (0.25 ml) of TIV in children 6-35 months of age with and without a history of previous TIV vaccination. The population will include a Naïve Cohort: 90 healthy male and female children who are 6-35 months of age and have never received an influenza vaccination; and a Fully Primed Cohort: 60 healthy male and female children who are 12-35 months of age and have received two doses of 2009-2010 H1N1 and two doses of TIV at anytime in the past as defined for purposes of this study. Either a standard pediatric dose (0.25 ml) or a larger dose (0.5 ml) of TIV will be administered intramuscularly in the anterolateral thigh with a 25 gauge 1" needle. The primary objective is to evaluate the safety of administering an increased dose(s) (0.5 ml) of TIV to children 6-35 months of age as compared to standard dose(s) (0.25 ml) of TIV. The secondary objective is to compare the humoral immune responses to TIV antigens in children 6-35 months of age who receive the increased dose(s) of TIV to those who receive the standard dose(s) of TIV.

Study Design

Allocation: Randomized, Endpoint Classification: Safety Study, Intervention Model: Parallel Assignment, Masking: Double Blind (Subject, Caregiver, Investigator, Outcomes Assessor), Primary Purpose: Prevention




Trivalent Inactivated Influenza Vaccine


Cincinnati Children's Hospital Medical Center
United States


Not yet recruiting


National Institute of Allergy and Infectious Diseases (NIAID)

Results (where available)

View Results


Published on BioPortfolio: 2014-08-27T03:12:09-0400

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Medical and Biotech [MESH] Definitions

Vaccines used to prevent infection by viruses in the family ORTHOMYXOVIRIDAE. It includes both killed or attenuated vaccines. The composition of the vaccines is changed each year in response to antigenic shifts and changes in prevalence of influenza virus strains. The vaccine is usually bivalent or trivalent, containing one or two INFLUENZAVIRUS A strains and one INFLUENZAVIRUS B strain.

Species of the genus INFLUENZAVIRUS B that cause HUMAN INFLUENZA and other diseases primarily in humans. Antigenic variation is less extensive than in type A viruses (INFLUENZA A VIRUS) and consequently there is no basis for distinct subtypes or variants. Epidemics are less likely than with INFLUENZA A VIRUS and there have been no pandemics. Previously only found in humans, Influenza B virus has been isolated from seals which may constitute the animal reservoir from which humans are exposed.

Membrane glycoproteins from influenza viruses which are involved in hemagglutination, virus attachment, and envelope fusion. Fourteen distinct subtypes of HA glycoproteins and nine of NA glycoproteins have been identified from INFLUENZA A VIRUS; no subtypes have been identified for Influenza B or Influenza C viruses.

Infection of domestic and wild fowl and other BIRDS with INFLUENZA A VIRUS. Avian influenza usually does not sicken birds, but can be highly pathogenic and fatal in domestic POULTRY.

A genus of the family ORTHOMYXOVIRIDAE comprising viruses similar to types A and B but less common, more stable, more homogeneous, and lacking the neuraminidase protein. They have not been associated with epidemics but may cause mild influenza. Influenza C virus is the type species.

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