Guinea pigs inoculated with the live M-44 vaccine strain of Coxiella burnetii were examined grossly and microscopically for the presence of Q fever-related lesions. Mild myocarditis was observed in 38% of the infected animals but in none of the control animals. Livers showed significant incidence of hepatitis, necrosis, and granuloma formation, especially during the first eight days of the infection. A much lower incidence of splenitis was also found but was considered to be of borderline significance. Generally, lesions were mild in nature, and none seemed to endanger the life of the animal or to cause observable distress.
A large, rapidly growing subcutaneous fibrosarcoma was observed on the head of an aged male white-tailed deer (Odocoileus virginianus) from Frederick County, Maryland. Although there was no evidence of distant metastasis, the large neoplastic mass had extensively invaded the osseous supraorbital process, and had several small satellite nodules nearby.
Abstract. Tyzzer's disease (bacillus piliformis infection) was diagnosed in a young guinea pig killed because of diarrhea and poor condition. There was necrosis and inflammation of the colon, cecum and ileum. Typical B . piliformis were in intestinal epithelial cells. Spirochetes were in large numbers in intestinal crypts and were often adjacent to the intracellular B . pilifbrrnis. Extracellular B . piliformis occasionally were surrounded by spirochetes.
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