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. 2022 Nov 10;10(11):1894. doi: 10.3390/vaccines10111894

Figure 2.

Figure 2

CpG 1018 increases pdm09 vaccine-induced HI titer. Old mice (78 weeks) were intradermally immunized with 0.5 µg pdm09 vaccine alone (Inline graphic) or in the presence of CpG 1018 adjuvant (40 µg, Inline graphic) or left non-immunized (Inline graphic). Young adult mice (6–8 weeks) were intradermally immunized with the same amount of pdm09 vaccine (Inline graphic) or left non-immunized (Inline graphic). Serum HI titer was measured 3 weeks after immunization. n = 4–7. One-way ANOVA with Fisher’s LSD test was used to compare differences between groups. *, p < 0.05; **, p < 0.01; ***, p < 0.001.