Histopathology of the lung following 1.25×10<sup>4</sup><i>Orientia</i> challenge.

<p>H & E stained uninfected lung tissue (<b>A-20×</b>) and IHC of uninfected lung (<b>B-40×</b>) compared with lung from i.p. inoculated mice 12 dpi (H&E <b>C-20×</b>, IHC <b>D-40×</b>), and lung from i.v. inoculated 15 dpi (H&E <b>E-20×</b>, IHC <b>F-40×</b>). All i.p. infections were lethal with less severe pulmonary cellular infiltrate when compared to that of i.v. infected mice with capillary endothelial cell infection of the aveolar septa.</p>