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Updated: Mar 21, 2026

An Optimized Hemagglutination Inhibition HI Assay to Quantify Influenza-specific Antibody Titers
Published on: December 1, 2017
Reduced serologic sensitivity to influenza A virus illness among inactivated influenza vaccinees
Mark G Thompson1, Manjusha J Gaglani2, Allison L Naleway3
1Influenza Division/NCIRD/CDC, Atlanta, GA 30333, United States.
Abstract:
We compared ≥4-fold increases in antibody titers by hemagglutination inhibition assay to RT-PCR results among 42 adults with PCR-confirmed influenza A virus illnesses. Serologic sensitivity was higher among unvaccinated (69%, 95% confidence interval [CI]=48-90%) than vaccinated healthcare personnel (38%, 95% CI=29-46%) in a 2010-11 prospective cohort.
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