Morphologic Diagnosis Heart (epicardium and fat): Moderate acute multifocal petechia and hemorrhage Clinical Description This image was taken 3 days post experimental inoculation with highly pathogenic avian influenza. As observed here, hemorrhages may also be prominent on the epicardium, depending on the strain of the virus. Pathologic Description The epicardial fat and epicardial surface of the heart are stippled by numerous pinpoint red foci. Additionally, there are larger, poorly demarcated bright red hemorrhages surrounding the congested coronary vessels.