CXCL10 and infection: In the early stage of infection (7d), infection with the cdh1Δ mutant strain can stimulate more robust secretion of Cxcl10 in lung tissue, but in the later stage, the expression level of CXCL10 is significantly reduced, which may be the reason why infection with the cdh1Δ mutant strain cannot effectively be eliminated from the body of the mice.