TRBC1 and infection: Since CD11bhighF4/80+ cells are a major subset early in infection and CD11bhighCD14+ cells are a major subset late in infection in susceptible C57BL/6 mice, we measured the effect of CD14 and F4/80 on TCRβ expression on gated CD11bhigh cells by comparing the percent expression and MFI of TCRβ on CD11bhigh, CD11bhighCD14+, CD11bhighF4/80+, and CD11bhighCD14+F4/80+ cells on days 2, 4, and 6 post-Pb−A infection (Fig 4B).