CCR2 and infection: Imaging flow cytometry on samples from Ifng−/− mice infected with mChLgyLRV1+ showed that neutrophils were the first and most abundantly increased cells in systemic circulation and varied in abundance in cycles along the course of infection, followed by monocytes, inflammatory monocytes (expressing CCR2+), macrophages, and even B and T cells (Figures 6Bi, ii).