Over a 4-mo period 23 of 28 white tailed deer kept at a small zoo in New Jersey (USA) died. Clinical signs prior to death were minimal and consisted of depression, central nervous system disorders, and watery diarrhea in a few animals only. Histopathology revealed widespread acute vascular lesions, ranging from modest accumulations of blast like mononuclear cells and edema in the adventitia through to disruption of the tunica media and thrombosis. These vascular lesions were seen in a variety of organs but were most prominent in lung, heart, liver and intestine. Severe vascular changes were associated with necrosis. Lymphoreticular hyperplasia was evident in the lymphoid tissue of all animals.
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