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. 2014 Mar 10;10(5):1195–1203. doi: 10.4161/hv.28313

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Figure 1. Percent of participants with seroprotective (titer ≥ 1:40) at Day 0 to A(H1N1) and A(H3N2) influenza virus strains. The overall height of the bars indicates the percent of participants with seroprotective titers (HI ≥ 1:40) to a given historical strain at Day 0. The upper part of each bar indicates the percent of those individuals who seroconverted (≥4-fold rise in titer) against the specified current influenza vaccine A virus strain. *Difference in percent seroprotected between age groups (P < 0.05). A/PR/8/1934 = A/Puerto Rico/8/1934; A/FM/1/1947 = A/Fort Monmouth/1/1947; A/TX/36/1991 = A/Texas/36/1991; A/NC/1999 = A/New Caledonia/20/1999; A/SI/2006 = A/Solomon Islands/3/2006; A/Bris/59/2007 = A/Brisbane/59/2007; A/CA/07/2009 = A/California/07/2009; A/Syd/5/1997 = A/Sydney/5/1997; A/Pan/2007/99 = A/Panama/2007/1999; A/Fuj/411/2002 = A/Fujian/411/2002; A/Wis/67/2005 = A/Wisconsin/67/2005; A/Bris/10/2007 = A/Brisbane/10/2007.