NS1del126 protein levels in PK-15 cells after lvTX98 infection were much lower than NS1 protein levels after wtTX98 infection (15) and the NS1del126 protein of mouse-adapted strains, which was sufficient to suppress IFN-β induction in vitro (26, 27), was unstable in vivo due to the lack of the C-terminal domain (27). The gene discussed is IFNB1; the disease is infection.