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The capD gene, encoding a polysaccharide biosynthesis protein, was identified previously as a differential gene between Haemophilus parasuis virulent strain Nagasaki and avirulent strain SW114; however, the characteristics of this gene associating with the pathogenicity of H. parasuis remain unclear. Here, the capD deletion mutant (ΔcapD) and its complement strain (C-capD) were generated in H. parasuis...