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. 2019 Sep 28;7(4):133. doi: 10.3390/vaccines7040133

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Focused titer analysis of the H1-2009 specific antibodies elicited in the PreUSSR-Vac2x and Naïve-Vac2x groups. HAI assay utilizing serum collected throughout the time course for the preUSSR-Vac2x and Naïve-Vac2x groups against the 2009 H1N1 pandemic Cal/09 virus are graphed to better visualize quantitative and statistical differences based on the contribution of preimmunity. Black arrows denote time of vaccination. Red arrow denotes the challenge day. Day 0 is the time of infection with the seasonal H1N1 USSR/77 virus. Values are graphed in HAI Units. * indicates a p-value of less than 0.05 as determined by Student’s t-test.