Quantification of NETs by immunofluorescence staining of citrullinated histone H3 (CitH3), alongside immune cell markers, confirmed our previous findings (Moreira-Teixeira et al., 2020a) that C3HeB/FeJ mice display extensive NET accumulation in lung lesions, which was largely ablated by early IFNAR blockade at 26 days after infection, with minimal effects at day 20 after infection (Fig. 9, i and j; and Fig. S5, e–g). Here, IFNAR1 is linked to infection.