ITGAM and infection: CD11b is the α‐subunit of 1 of the 3 β2‐integrin surface receptors—CD11b/CD18 (forming membrane‐associated component‐1, Mac‐1, MO‐1, complement receptor 3, CR3) which is expressed on bovine neutrophils and involved in cell migration into the site of inflammation or infection.20, 21, 22