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A 2-week-old northern fur seal female pup (Callorhinus ursinus) found dead in the Pribilof Islands had an irregular mass at the anterior pole of the right kidney. Histopathological examination revealed a fibrosarcoma.

A 4-year study of Northern fur seal (Callorhinus ursinus) leptospirosis in the Bering Sea has shown that in newborn pups Leptospira pomona is associated with a multiple hemorrhage syndrome. Adults may develop an interstitial nephritis and shed organisms in the urine. The hed prevalence, based on microscopic slide agglutination tests, ranged between 7.0% and 15.4% for adult females and 3-4 year old bachelor bulls, whereas nursing pups averaging 4 months of age had a prevalence of 2%. These results are used to conclude that leptospirosis is not acquired primarily on the breeding rookeries but rather is more frequently acquired subsequent to the purps leaving the rookeries, presumably through the food chain during their first pelagic cycle.

Sea lions aborting on San Miguel Island, California, and fur seals on St. Paul Island, Alaska, were studied for the presence of infectious disease agents. Leptospira were isolated from both groups and may have been one cause of reproductive failure in both species. From a total of seven virus isolations made, one isolate from fur seals and two isolates from sea lions appear antigenically related by serum neutralization tests. In their host range, morphology, and physicochemical properties, the virus isolates are indistinguishable from Vesicular Exanthema of Swine Virus. Six mycoplasma isolations have been made but have not been fully characterized. A fungus, Scopulariopsis sp., isolated from three different sea lions, is the same genus that was repeatedly isolated from Navy divers during prolonged submergence studies.

Internal hydrocephalus was observed in a newborn llama (Llama glama). The animal was sacrificed after 6 days of signs of intractable central nervous system disease.

A 4 year old female African bush elephant developed a slowly-growing mass of 6 months' duration on the medial aspect of the carpal area of the right front leg. Histopathological examination revealed a low grade fibrosarcoma.

A 10 year old male Indian leopard developed a rapidly enlarging mass on the volar left forepaw. Histopathologic examination revealed a basal cell tumor. No reoccurrence has been reported to date, 1 year after excision.