tetano
Editor, Senior Moderator
J Infect Dis. 2019 Jul 6. pii: jiz327. doi: 10.1093/infdis/jiz327. [Epub ahead of print]
[h=1]The effect of influenza vaccination history on changes in hemagglutination inhibition titers following receipt of the 2015/16 influenza vaccine in older adults in Hong Kong.[/h] Ng TWY[SUP]1[/SUP], Perera RAPM[SUP]1[/SUP], Fang VJ[SUP]1[/SUP], Yau EM[SUP]1[/SUP], Peiris JSM[SUP]1[/SUP], Tam YH[SUP]1[/SUP], Cowling BJ[SUP]1[/SUP].
[h=3]Author information[/h]
[h=3]Abstract[/h] [h=4]BACKGROUND:[/h] Immune responses to influenza vaccination can be weaker in older adults than in other age groups. We hypothesized that antibody responses would be particularly weak among repeat vaccinees when the current and prior season vaccine components are the same.
[h=4]METHODS:[/h] An observational study was conducted among 827 older adults aged ≥75 years in Hong Kong. Sera were collected immediately before and one month after receipt of the 2015/16 quadrivalent inactivated influenza vaccine. We measured antibody titers with the hemagglutination inhibition assay, and compared mean fold rise in titers from pre- to post-vaccination, and the proportion with post-vaccination titers ≥40 and ≥160.
[h=4]RESULTS:[/h] Participants who reported receipt of vaccination during either of the previous two years had lower mean fold rise against all strains compared to those who were not. Mean fold rises for A(H3N2) and B/Yamagata were particularly weak following repeated vaccination with the same vaccine strain, but we did not generally find significant differences in the proportion of participants with post-vaccination titers ≥40 and ≥160.
[h=4]CONCLUSIONS:[/h] Overall, we found that reduced antibody responses in repeat vaccinees were particularly reduced among older adults who had received vaccination against the same strains in preceding years.
? The Author(s) 2019. Published by Oxford University Press for the Infectious Diseases Society of America. All rights reserved. For permissions, e-mail: journals.permissions@oup.com.
[h=4]KEYWORDS:[/h] immune response; influenza vaccine; repeated vaccination
PMID: 31282541 DOI: 10.1093/infdis/jiz327
[h=1]The effect of influenza vaccination history on changes in hemagglutination inhibition titers following receipt of the 2015/16 influenza vaccine in older adults in Hong Kong.[/h] Ng TWY[SUP]1[/SUP], Perera RAPM[SUP]1[/SUP], Fang VJ[SUP]1[/SUP], Yau EM[SUP]1[/SUP], Peiris JSM[SUP]1[/SUP], Tam YH[SUP]1[/SUP], Cowling BJ[SUP]1[/SUP].
[h=3]Author information[/h]
[h=3]Abstract[/h] [h=4]BACKGROUND:[/h] Immune responses to influenza vaccination can be weaker in older adults than in other age groups. We hypothesized that antibody responses would be particularly weak among repeat vaccinees when the current and prior season vaccine components are the same.
[h=4]METHODS:[/h] An observational study was conducted among 827 older adults aged ≥75 years in Hong Kong. Sera were collected immediately before and one month after receipt of the 2015/16 quadrivalent inactivated influenza vaccine. We measured antibody titers with the hemagglutination inhibition assay, and compared mean fold rise in titers from pre- to post-vaccination, and the proportion with post-vaccination titers ≥40 and ≥160.
[h=4]RESULTS:[/h] Participants who reported receipt of vaccination during either of the previous two years had lower mean fold rise against all strains compared to those who were not. Mean fold rises for A(H3N2) and B/Yamagata were particularly weak following repeated vaccination with the same vaccine strain, but we did not generally find significant differences in the proportion of participants with post-vaccination titers ≥40 and ≥160.
[h=4]CONCLUSIONS:[/h] Overall, we found that reduced antibody responses in repeat vaccinees were particularly reduced among older adults who had received vaccination against the same strains in preceding years.
? The Author(s) 2019. Published by Oxford University Press for the Infectious Diseases Society of America. All rights reserved. For permissions, e-mail: journals.permissions@oup.com.
[h=4]KEYWORDS:[/h] immune response; influenza vaccine; repeated vaccination
PMID: 31282541 DOI: 10.1093/infdis/jiz327