Using a classical K. pneumoniae ST258 strain from a US hospital outbreak (KP35), Ahn and coworkers noted the abundance of the monocytic MDSCs (CD11b+Ly6C+Ly6Glo) rather than the granulocytic MDSCs (CD11b+Ly6CloLy6G+) early during infection (2 days) [11]. The gene discussed is ITGAM; the disease is infection.