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The hemagglutination inhibition antibody responses to an inactivated influenza vaccine among healthy adults: with special reference to the prevaccination antibody and its interaction with age

Identifieur interne : 001C06 ( Main/Exploration ); précédent : 001C05; suivant : 001C07

The hemagglutination inhibition antibody responses to an inactivated influenza vaccine among healthy adults: with special reference to the prevaccination antibody and its interaction with age

Auteurs : Yoshio Hirota [Japon] ; Masaro Kaji [Japon] ; Saburo Ide [Japon] ; Shuro Goto [Japon] ; Tetsuya Oka [Japon]

Source :

RBID : ISTEX:54CB1E6B488CBF8626F2DF25D03ACD77B6AA34A7

English descriptors

Abstract

Abstract: The immunogenicity of the trivalent split-virus influenza vaccine was investigated among 70 healthy adults (mean age: 48.5, range: 36–68). The vaccine antigens were: A/Yamagata/32/89 (H1N1); A/Beijing/352/89 (H3N2); and B/Bangkok/163/90. Regarding the entire sample, the vaccine induced a tenfold or more rise on the average in the hemagglutination inhibition (HAI) antibody to each antigen. The response rates (greater than or equal to a fourfold rise) were about 90% or more among those with a prevaccination titer ≤1:64 (equivalent to ≤1:16 on the Western scale: in Japan, the HAI titers are expressed by the final, and not the initial, dilution of the serum; from hereon our findings will be expressed using the Japanese scale), whereas they were 0–50% at ≥1:128. Thus, the prevaccination titer was negatively associated with antibody induction. The achievement rates (postvaccination titer ≥1:128) among those with a prevaccination titer <1:16 remained at 48–68%. Regarding the analysis of variance, a significant effect on antibody induction was indicated for the prevaccination titer (P≤0.002), but not for age (P≥0.425). The interaction between the prevaccination titer and age was significant for A/Yamagata (P=0.030), while it was also suggestive for A/Beijing (P=0.054): as age increased, those with no preexisting antibody (<1:16) showed greater titer rises, in contrast to the smaller rises among those with a titer ≥1:16. Based on the attack survey conducted separately, the vaccine efficacy on influenza-like illnesses with fever ≥37°C and ≥37.5°C was calculated to be 16% (95% confidence interval: −66% to 57%) and 37% (−55% to 74%), respectively.

Url:
DOI: 10.1016/S0264-410X(96)00153-3


Affiliations:


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<div type="abstract" xml:lang="en">Abstract: The immunogenicity of the trivalent split-virus influenza vaccine was investigated among 70 healthy adults (mean age: 48.5, range: 36–68). The vaccine antigens were: A/Yamagata/32/89 (H1N1); A/Beijing/352/89 (H3N2); and B/Bangkok/163/90. Regarding the entire sample, the vaccine induced a tenfold or more rise on the average in the hemagglutination inhibition (HAI) antibody to each antigen. The response rates (greater than or equal to a fourfold rise) were about 90% or more among those with a prevaccination titer ≤1:64 (equivalent to ≤1:16 on the Western scale: in Japan, the HAI titers are expressed by the final, and not the initial, dilution of the serum; from hereon our findings will be expressed using the Japanese scale), whereas they were 0–50% at ≥1:128. Thus, the prevaccination titer was negatively associated with antibody induction. The achievement rates (postvaccination titer ≥1:128) among those with a prevaccination titer <1:16 remained at 48–68%. Regarding the analysis of variance, a significant effect on antibody induction was indicated for the prevaccination titer (P≤0.002), but not for age (P≥0.425). The interaction between the prevaccination titer and age was significant for A/Yamagata (P=0.030), while it was also suggestive for A/Beijing (P=0.054): as age increased, those with no preexisting antibody (<1:16) showed greater titer rises, in contrast to the smaller rises among those with a titer ≥1:16. Based on the attack survey conducted separately, the vaccine efficacy on influenza-like illnesses with fever ≥37°C and ≥37.5°C was calculated to be 16% (95% confidence interval: −66% to 57%) and 37% (−55% to 74%), respectively.</div>
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