CXCL12 and infection: Moreover, cxcl1, cxcl2, cxcl9, cxcl11.1, cxcl11.6-1, cxcl11.6-2, cxcl12, ccl3-2, ccl19-1, ccl19-2, ccl20, and cclSCYA 101, 107, 114 mRNAs were significantly and continuously induced after E. ictaluri infection, implying that yellow catfish immune cells can be activated and recruited to the sites of infection at early time points post-infection.