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Pseudomonas aeruginosa is a common gram-negative bacterium that usually causes nosocomial infection. The main pathogenicity of P. aeruginosa is caused by its virulence factors. PA2146 is reported to be a potential virulence-regulating gene and is highly expressed in the biofilms of P. aeruginosa. However, the effect of PA2146 mutant (PAO1ΔPA2146) on the macrophage immune response and murine models has not been reported. In the present study, PA2146 knockout was performed by homologous recombination. We found that PAO1ΔPA2146 stimulatio