We used the rescued strain rSczy3 to infect CEKs and performed qRT-PCR to evaluate the relative expression levels of CTSL, CTSB, Abl1, Abl2, IFITM3, ADAM17, TMPRSS2, NRP1, and CD74 at 12 and 24 h post-infection. The gene discussed is CTSL; the disease is infection.