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PLoS By Category | Recent PLoS Articles
Biotechnology - Geriatrics - Immunology - Infectious Diseases

A T Cell-Inducing Influenza Vaccine for the Elderly: Safety and Immunogenicity of MVA-NP+M1 in Adults Aged over 50 Years
Published: Wednesday, October 31, 2012
Author: Richard D. Antrobus et al.

by Richard D. Antrobus, Patrick J. Lillie, Tamara K. Berthoud, Alexandra J. Spencer, James E. McLaren, Kristin Ladell, Teresa Lambe, Anita Milicic, David A. Price, Adrian V. S. Hill, Sarah C. Gilbert

Background

Current influenza vaccines have reduced immunogenicity and are of uncertain efficacy in older adults. We assessed the safety and immunogenicity of MVA-NP+M1, a viral-vectored influenza vaccine designed to boost memory T cell responses, in a group of older adults.

Methods

Thirty volunteers (aged 50–85) received a single intramuscular injection of MVA-NP+M1 at a dose of 1·5×108 plaque forming units (pfu). Safety and immunogenicity were assessed over a period of one year. The frequency of T cells specific for nucleoprotein (NP) and matrix protein 1 (M1) was determined by interferon-gamma (IFN-?) ELISpot, and their phenotypic and functional properties were characterized by polychromatic flow cytometry. In a subset of M1-specific CD8+ T cells, T cell receptor (TCR) gene expression was evaluated using an unbiased molecular approach.

Results

Vaccination with MVA-NP+M1 was well tolerated. ELISpot responses were boosted significantly above baseline following vaccination. Increases were detected in both CD4+ and CD8+ T cell subsets. Clonality studies indicated that MVA-NP+M1 expanded pre-existing memory CD8+ T cells, which displayed a predominant CD27+CD45RO+CD57-CCR7- phenotype both before and after vaccination.

Conclusions

MVA-NP+M1 is safe and immunogenic in older adults. Unlike seasonal influenza vaccination, the immune responses generated by MVA-NP+M1 are similar between younger and older individuals. A T cell-inducing vaccine such as MVA-NP+M1 may therefore provide a way to circumvent the immunosenescence that impairs routine influenza vaccination.

Trial Registration

ClinicalTrials.gov NCT00942071

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