IFNA1 and infection: IFN-α1 AS RNA rapidly and reversibly upregulates IFN-α1 mRNA levels upon infection of human Namalwa B lymphocytes with Sendai virus (SeV; a paramyxovirus) and following infection of guinea pig (gp) 104C1 fetal fibroblasts with influenza virus A/PR/8/34 (PR8 virus).