H1N1-specific systemic IgG and hemagluttination inhibition (HAI) titers elicited by different immunization strategies.

<p>Serum samples from the mice described in the legend to <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0069649#pone-0069649-g001" target="_blank">Figure 1</a> were collected on day 34 prior to virus challenge (A) and day 37 upon sacrifice (B). (A) Total IgG responses after two immunizations. 10log IgG titers of individual mice and the geometric mean per group are given. (B) HAI titers after two immunizations and virus challenge. Individual 2log HAI titers and the geometric mean per group are given. Due to technical reasons only 5 samples from the 2P treatment group were available for the HAI assay.