FUT4 and idiopathic pulmonary fibrosis: By contrast, myeloid cells taken as a whole (CD11b+; CD14+, Figures 1G–I), and more particularly neutrophils (CD15+CD66+, Figures 1J, K) were increased in the M-COV and ICU groups (both COV- and non-COV), when compared to the ‘non-acute’ groups (HC and IPF).