Effects of Repeated Annual Inactivated Influenza Vaccination among Healthcare Personnel on Serum Hemagglutinin Inhibition Antibody Response to A/Perth/16/2009 (H3N2)-like virus during 2010-11

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• 作者：Mark G. Thompson ; PhD^a ; ^{isq8@cdc.gov" class="auth_mail" title="E-mail the corresponding author} ; Allison Naleway ; PhD^b ; Alicia M. Fry ; MD MPH^a ; Sarah Ball ; MPH ; ScD^c ; Sarah M. Spencer ; PhD^a ; Sue Reynolds ; MPH PhD^a ; Sam Bozeman ; MPH^b ; Min Levine ; PhD^a ; Jacqueline M. Katz ; PhD^a ; Manjusha Gaglani ; MBBS^d
• 关键词：influenza vaccination ; hemagglutination inhibition antibody ; healthcare personnel ; immunogenicity
• 刊名：Vaccine
• 出版年：2016
• 出版时间：10 February 2016
• 年：2016
• 卷：34
• 期：7
• 页码：981-988
• 全文大小：611 K

文摘

Recently, lower estimates of influenza vaccine effectiveness (VE) against A(H3N2) virus illness among those vaccinated during the previous season or multiple seasons have been reported; however, it is unclear whether these effects are due to differences in immunogenicity.

Methods

We performed hemagglutination inhibition antibody (HI) assays on serum collected at preseason, ∼30 days post-vaccination, and postseason from a prospective cohort of healthcare personnel (HCP). Eligible participants had medical and vaccination records for at least four years (since July, 2006), including 578 HCP who received 2010-11 trivalent inactivated influenza vaccine [IIV3, containing A/Perth/16/2009-like A(H3N2)] and 209 HCP who declined vaccination. Estimates of the percentage with high titers (≥40 and > 100) and geometric mean fold change ratios (GMRs) to A/Perth/16/2009-like virus by number of prior vaccinations were adjusted for age, sex, race, education, household size, hospital care responsibilities, and study site.

Results

Post-vaccination GMRs were inversely associated with the number of prior vaccinations, increasing from 2.3 among those with 4 prior vaccinations to 6.2 among HCP with zero prior vaccinations (F[4,567] = 9.97, p < .0005). Thirty-two percent of HCP with 1 prior vaccination achieved titers >100 compared to only 11% of HCP with 4 prior vaccinations (adjusted odds ratio = 6.8, 95% CI = 3.1 – 15.3).

Conclusion

Our findings point to an exposure-response association between repeated IIV3 vaccination and HI for A(H3N2) and are consistent with recent VE observations. Ultimately, better vaccines and vaccine strategies may be needed in order to optimize immunogenicity and VE for HCP and other repeated vaccinees.