CD4 and infection: Five weeks after infection, the numbers of most cell types, and especially of the CD4+ T lymphocytes and neutrophils (GR-1+), increased significantly in infiltrates in mice infected with either isolate; however, CD8+ T lymphocytes, dendritic cells (CD11b+CD11c+) and macrophages (CD11b+CD11c−) were not significantly increased in infiltrates in LTCP15171(S)-inoculated mice.