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CpG ODN promote survival following listeria challenge. C57BL/6 or NOS2 KO mice were injected i.p. with 50 μg of control or CpG ODN (n = 10 to 15/group). Three days later, mice were challenged with 10 LD50 of L. monocytogenes. *, P < 0.05; ***, P < 0.001 (Wilcoxon rank sum test).
