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. 2011 Nov 3;54(1):17–24. doi: 10.1093/cid/cir753

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© The Author 2011. Published by Oxford University Press on behalf of the Infectious Diseases Society of America. All rights reserved. For Permissions, please email:journals.permissions@oup.com.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/), which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 1. — Homologous immune responses in serum samples of 2009 pandemic vaccine recipients. Twenty-three volunteers received 1 dose of 2009 pandemic vaccine. Serum samples were collected before and 21 days after vaccination. A, The individual IC₅₀ titers (reciprocal 50% inhibitory concentration) before (gray) and after (dark) vaccination. B, Correlation between the IC₅₀ titers and hemagglutination-inhibition (HI) titers in serum samples post vaccination. C, Correlation between the increase of HI titer from baseline (HI post – HI pre) and the change in magnitude of IC₅₀ titer from baseline (IC₅₀ post – IC₅₀ pre).