FIG. 7.
Histological sections of hearts from A. baumannii-infected C57BL/6 mice. (A to C) Histopathology results for mouse hearts from 98-37-09-infected mice (A) Section through the aortic valve (arrowheads) with no evidence of endocarditis (hematoxylin and eosin; magnification, ×40). (B) Section through pericardium that has lifted away from the heart surface demonstrating pericarditis with infiltration of neutrophils and macrophages (hematoxylin and eosin; magnification, ×100). Bacteria are easily observed in the pericardial tissue (arrow in the inset). (C) Section through pericardium (Gram stain; magnification, ×100). Bacteria are indicated by the arrow in the inset. (D to F) Histopathology results for ACJ2-infected mouse hearts. (D) Section through aortic valve (arrowhead) with no evidence of endocarditis (hematoxylin and eosin; magnification, ×20). (E) Section through pericardium demonstrating pericarditis with few bacteria, indicated by the arrow (hematoxylin and eosin; magnification, ×100). (F) Section through pericardium (Gram stain; magnification, ×100).