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Photomicrograph of atrial thrombosis with secondary bacterial infection and myocarditis in a rat with a chronic indwelling jugular vein catheter. A large septic thrombus (T; bacterial colonies indicated by arrows) is firmly adherent to the endocardium and there is significant infiltration of the myocardium (C) with neutrophils. The thrombus has not entirely occluded the atrium, as a small lumen (L) is present. Hematoxylin and eosin stain; magnification, ×40.
