Comparison of the Immunogenicity, Safety and Reactogenicity of FluBlok, To a Licensed Vaccine In Elderly Adults

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00395174
Recruitment Status : Completed
First Posted : November 2, 2006
Last Update Posted : December 17, 2009
Information provided by:
Protein Sciences Corporation

October 30, 2006
November 2, 2006
December 17, 2009
October 2006
May 2007   (Final data collection date for primary outcome measure)
Evaluation of safety and reactogenicity of FluBlok and TIV in medically stable adults 65 years and older. [ Time Frame: influenza season ]
To compare the immunogenicity of FluBlØk and TIV in ambulatory elderly adults (65 years or older).
Complete list of historical versions of study NCT00395174 on Archive Site
  • Comparison of relative efficacy and effectiveness of FluBlok and TIV in medically stable adults 65 years and older. [ Time Frame: influenza season ]
  • Evaluation and comparison of immunogenicity of FluBlok and TIV in medically stable adults 65 years and older. [ Time Frame: influenza season ]
  • To compare the safety and reactogenicity of TIV and FluBlØk
  • To compare the relative efficacy and effectiveness of the two vaccines for prevention of culture-positive CDC ILI and/or culture-positive medically attended acute respiratory illness during the 2006-2007 influenza epidemic season.
Not Provided
Not Provided
Comparison of the Immunogenicity, Safety and Reactogenicity of FluBlok, To a Licensed Vaccine In Elderly Adults
Comparison of the Immunogenicity, Safety and Reactogenicity of FluBlok, Trivalent Recombinant Baculovirus-Expressed Hemagglutinin Influenza Vaccine, to a Licensed Egg-Grown Influenza Vaccine In Ambulatory Elderly Adults
The purpose of this study were to obtain additional evidence in support of the safety and immunogenicity of a recombinant hemagglutinin (rHA) vaccine in an elderly population, and to establish non-inferiority of the immunogenicity of the rHA vaccine when compared with a licensed trivalent influenza vaccine (TIV). Another purpose was to provide a preliminary estimate of the relative efficacy of the two vaccines against culture-positive influenza-like illness during the subsequent epidemic.

Annual influenza epidemics are associated with serious excess morbidity and mortality, particularly among the elderly. Licensed trivalent inactivated influenza vaccines (TIVs) have been shown to reduce hospitalization and death following influenza in this vulnerable population, but their efficacy is lower than that observed in younger, healthy populations. In addition, recent studies have questioned the level of effectiveness of TIV in the elderly, suggesting that cohort studies have overestimated the benefits of immunization with current TIV formulations in this age group. In view of these considerations, it is widely accepted that improved and alternative vaccines are needed for control of seasonal and pandemic influenza.

Currently available TIVs are prepared from viruses that are grown in embryonated hens' eggs. Alternative substrates for vaccine production are desirable in order to reduce the vulnerability of and to expand influenza vaccine supply. Recombinant DNA techniques allow for expression of the influenza hemagglutinin (rHA) by baculovirus vectors in insect cell cultures. Advantages of this technique include speed of production, absence of egg protein, and a highly purified product. Previous studies among healthy younger and older adults have confirmed that rHA vaccines are safe, well tolerated and immunogenic at dosages up to nine times higher than those contained in TIV. Dose-related increases in serum antibody levels after immunization also were observed.

Phase 3
Allocation: Randomized
Intervention Model: Factorial Assignment
Masking: Double (Participant, Investigator)
Primary Purpose: Prevention
Biological: Influenza Vaccination
0.5mL dose for intramuscular injection
Other Names:
  • FluBlok
  • Fluzone
  • rHA
  • rHA0
  • recombinant hemagglutinin
  • TIV
  • Experimental: FluBlok

    Recombinant Trivalent Hemagglutinin Influenza Vaccine: 2005-2006 formulation containing 45μg of each hemagglutinin derived from A/New Caledonia (H1N1), A/Wisconsin (H3N2) and B/Ohio

    135μg total

    Intervention: Biological: Influenza Vaccination
  • Active Comparator: TIV (Fluzone)

    Licensed trivalent influenza vaccine (TIV): 2005-2006 formulation containing 15μg of each hemagglutinin derived from A/Wisconsin (H3N2), A/New Caledonia (H1N1) and B/Malaysia

    45μg total

    (Fluzone, sanofi pasteur)

    Intervention: Biological: Influenza Vaccination

*   Includes publications given by the data provider as well as publications identified by Identifier (NCT Number) in Medline.
May 2007
May 2007   (Final data collection date for primary outcome measure)

Inclusion Criteria:

  • Ambulatory adults aged 65 and older
  • Medically stable, as determined by oral temperature <100.0°F, medical history, and targeted physical examination based on medical history
  • Able to understand and comply with planned study procedures
  • Provides written informed consent prior to initiation of any study procedure.

Exclusion Criteria:

  • Known allergy to eggs or other vaccine components.
  • Immunosuppression as a result of an underlying illness or treatment, or used anticancer chemotherapy or radiation therapy within the preceding 36 months.
  • Any malignancy (excluding nonmelanotic skin cancer or lymphoproliferative disorder), other than localized prostrate cancer, diagnosed or treated actively during the past 5 years. Subjects with any history of lymphoproliferative disorder will be excluded, while subjects with a history of localized nonmelanotic skin cancer may be eligible.
  • Long-term use of oral steroids, parenteral steroids, or high-dose inhaled steroids within the preceding 6 months (Nasal and topical steroids are allowed).
  • Major psychiatric diagnosis including schizophrenia, bipolar disease or other major depression, or any diagnosis of dementia or associated concomitant medications (e.g., Aricept) used for treating dementia
  • History of receiving immunoglobulin or other blood product within the 3 months prior to enrollment in this study.
  • Receipt of any other licensed vaccines within 2 weeks (for inactivated vaccines) or 4 weeks (for live vaccines) prior to enrollment in this study.
  • History of severe reactions following immunization with influenza virus vaccines.
  • Moderate to severe acute illness or febrile illness (oral temperature greater than 100*F) within 1 week prior to vaccination.
  • Receipt of an experimental agent (vaccine, drug, biologic, device, blood product or medication) within 1 month prior to enrollment in this study, or expects to receive an experimental agent during study period.
  • Known active human immunodeficiency virus, hepatitis B, or hepatitis C infection.
  • History of alcohol or drug abuse in the last 5 years.
  • History of Guillain-Barré Syndrome.
  • Any acute or chronic medical condition that, in the opinion of the investigator, would render vaccination unsafe, interfere with the evaluation of responses, or render the subject unable to meet the requirements of the protocol. These conditions include, but are not limited to: history of significant renal impairment (dialysis and treatment for kidney disease, including diabetic and hypertensive kidney disease); subjects with diabetes mellitus, well-controlled with oral agents may enroll as long there has been no dosage increase within the past 6 months; insulin-dependent diabetes is excluded; cardiac insufficiency, if heart failure is present (New York Heart Association Functional Class III or IV); an arteriosclerotic event during the 6 months prior to enrollment (e.g., history of myocardial infarction, stroke, recanalization of femoral arteries, or transient ischemic attack).
Sexes Eligible for Study: All
65 Years and older   (Older Adult)
Contact information is only displayed when the study is recruiting subjects
United States
Not Provided
Not Provided
Manon Cox, Chief Operating Officer, Protein Sciences Corporation
Protein Sciences Corporation
Not Provided
Principal Investigator: Wendy A. Keitel, MD Baylor College of Medicine
Principal Investigator: Hana M. El-Sahly, MD Baylor College of Medicine
Principal Investigator: John J. Treanor, MD University of Rochester Medical
Principal Investigator: Keith S. Reisinger, MD Primary Physicians research
Principal Investigator: Gregory A. Poland, MD Mayo Clinic College of Medicine
Principal Investigator: Kenneth D. Lessans, MD Passport Health Maryland
Principal Investigator: John J. Minneti, MD Passport Health New Jersey
Principal Investigator: Kristen Lyke, MD Center of Vaccine Development, University of Maryland
Protein Sciences Corporation
December 2009

ICMJE     Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP