RAG2 and infection: After RSV‐infection, the levels of type I IFNs, ISGs, monocytes, and neutrophils were very similar in Rag2−/− mice compared with Wt mice, and a difference in viral load was not observed until day 7 p.i. However, NK cells were recruited into the lungs of Rag2−/− mice as early as day 2 p.i., leading to an early production of IFN‐γ.