Type I interferon signaling is required for resistance to primary influenza virus infection and vaccine-induced long-term immunity

Type I interferons (IFNs) are critical for early antiviral defense, yet their role in shaping vaccine-induced immunity remains incompletely understood. Here, we investigated the impact of type I IFN receptor (IFNαβR) deficiency on immune responses to influenza virus infection and vaccination in IFNαβR-deficient (AB6) mice. AB6 mice exhibited profound susceptibility to influenza virus infection, characterized by accelerated weight loss, elevated lung viral loads, and severe histopathology. Despit