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Expert Rev Vaccines. 2019 Jan 28. doi: 10.1080/14760584.2019.1575734. [Epub ahead of print]
Immunogenicity of high-dose trivalent inactivated influenza vaccine: a systematic review and meta-analysis.
Samson SI1, Leventhal PS2, Salamand C3, Meng Y1, Seet BT1,4, Landolfi V1, Greenberg D1,5, Hollingsworth R1.
Author information
Abstract
High-dose trivalent, inactivated, split-virus influenza vaccine (IIV3-HD) has been available in the US since 2009 for adults aged ≥ 65 years. To better understand how IIV3-HD provides improved protection against influenza, we systematically reviewed clinical studies comparing immune responses to IIV3-HD and standard-dose trivalent vaccine (IIV3-SD). Areas covered: The primary objective was to determine the relative hemagglutination inhibition (HAI) antibody response of IIV3-HD vs. IIV3-SD in adults aged ≥ 65 years. Based on seven randomized studies including more than 18,500 adults aged ≥ 65 years, combined HAI geometric mean titer (GMT) ratios (95% confidence interval) approximately 1 month post-vaccination were 1.74 (1.65-1.83) for influenza A/H1N1, 1.84 (1.73-1.95) for influenza A/H3N2, and 1.47 (1.36-1.58) for influenza B. HAI GMT ratios in these studies were similar irrespective of sex, older age (≥ 75 years), frailty, and underlying conditions. Trends were similar for A/H3N2 neutralization and anti-neuraminidase antibody titers. In immunocompromised individuals, HAI GMT ratios were mostly > 1. Expert opinion: In agreement with its improved efficacy and effectiveness, IIV3-HD is consistently more immunogenic than IIV3-SD in adults aged ≥ 65 years. IIV3-HD also appears more immunogenic in immunocompromised individuals.
KEYWORDS:
elderly adults; high-dose influenza vaccine; immunocompromised; immunogenicity; systematic review
PMID: 30689467 DOI: 10.1080/14760584.2019.1575734
Immunogenicity of high-dose trivalent inactivated influenza vaccine: a systematic review and meta-analysis.
Samson SI1, Leventhal PS2, Salamand C3, Meng Y1, Seet BT1,4, Landolfi V1, Greenberg D1,5, Hollingsworth R1.
Author information
Abstract
High-dose trivalent, inactivated, split-virus influenza vaccine (IIV3-HD) has been available in the US since 2009 for adults aged ≥ 65 years. To better understand how IIV3-HD provides improved protection against influenza, we systematically reviewed clinical studies comparing immune responses to IIV3-HD and standard-dose trivalent vaccine (IIV3-SD). Areas covered: The primary objective was to determine the relative hemagglutination inhibition (HAI) antibody response of IIV3-HD vs. IIV3-SD in adults aged ≥ 65 years. Based on seven randomized studies including more than 18,500 adults aged ≥ 65 years, combined HAI geometric mean titer (GMT) ratios (95% confidence interval) approximately 1 month post-vaccination were 1.74 (1.65-1.83) for influenza A/H1N1, 1.84 (1.73-1.95) for influenza A/H3N2, and 1.47 (1.36-1.58) for influenza B. HAI GMT ratios in these studies were similar irrespective of sex, older age (≥ 75 years), frailty, and underlying conditions. Trends were similar for A/H3N2 neutralization and anti-neuraminidase antibody titers. In immunocompromised individuals, HAI GMT ratios were mostly > 1. Expert opinion: In agreement with its improved efficacy and effectiveness, IIV3-HD is consistently more immunogenic than IIV3-SD in adults aged ≥ 65 years. IIV3-HD also appears more immunogenic in immunocompromised individuals.
KEYWORDS:
elderly adults; high-dose influenza vaccine; immunocompromised; immunogenicity; systematic review
PMID: 30689467 DOI: 10.1080/14760584.2019.1575734