MKI67 and infection: Onward populations of non-committed progenitors were highly proliferative both in naïve and infected mice, and following infection these resulted in an increased number of LSK CD150+ CD34- CD48+ Ki67+ cells and LSK CD150+ CD34+ Ki67+ cells in infected mice (90-fold and 4.8-fold, respectively, compared to naive mice) (Fig 3Ai and 3B).