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. 2017 Nov 27;14(3):596–608. doi: 10.1080/21645515.2017.1384106

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© 2018 The Author(s). Published with license by Taylor & Francis

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 2. — Persistence of hemagglutination inhibition (HAI) antibody titers up to 1 year after vaccination with the quadrivalent inactivated influenza vaccine (IIV4). HAI geometric mean antibody titers (GMTs) for younger adult (18–60 years) and older adult (>60 years) participants vaccinated with IIV4 are shown at baseline (day 0), the end of the primary efficacy assessment period (day 21), the end of the safety follow-up period (month 6), and month 12. Values are for all subjects vaccinated and with data available.