Histopathology of pulmonary tularemia in mice immunized with <i>ΔclpB</i> or LVS.

<p><b>left</b>: The lung from an LVS-immunized mouse killed at day 7 post challenge showing severe subacute bronchopneumonia. The alveolar spaces are filled with large numbers of intact and degenerated neutrophils (arrows) admixed with small numbers of mononuclear cells. (<b>right</b>) the lung from a <i>clpB</i>-immunized mouse killed at day 7 post challenge showing the infiltration of predominantly mononuclear cells (arrowheads) with virtually no neutrophils in the peribronchial area. H&E, x400.