IFNG and Klebsiella Infections: Remarkably, type I IFN signalling is dispensable in myeloid cells including alveolar macrophages, monocytes and neutrophils for host defence and IFNγ activation (Ivin et al.2017), uncovering a hitherto unknown crosstalk between alveolar macrophages and NK cells based on type I IFN and IFNγ in Klebsiella infection.