Fig. 5From: Recombinant PAL/PilE/FlaA DNA vaccine provides protective immunity against Legionella pneumophila in BALB/c miceThe cytokine levels of serum samples collected from mice at 16 h after a lethal challenge with Legionella pneumophila. The TNF-α (a), IFNγ (b), and IL-10 (c) levels were evaluated by ELISA kits. All data were expressed as mean ± SD (n = 6). ***P < 0.001 versus the L.p-pcDNA3.1 groupBack to article page