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A case of malignant nephroblastoma was identified in a 4.5-month-old female Macaca fascicularis. The age of onset, clinical history, gross and microscopic pathology, and the pulmonary metastasis were analogous to this condition as seen in man.

Twenty-one of 24 simian primates with acute gastric dilatation had Clostridium perfringens in their gastric contents. Only 2 of 18 normal animals contained this organism in their gastric contents. Clostridium perfringens was isolated from monkey biscuits taken from the cages of five affected animals and from five of 11 incoming lots of feed. After these biscuits were fed to normal animals, this organism could be isolated from the gastric contents. There were no other organisms isolated which could account for the voluminous gas production in this condition.

Plasmodium inui malaria is an infrequently reported disease of Macaca mulatta. In this report a total of 21 of 48 monkeys in a closed colony of diabetic animals developed hematological evidence of P. inui infection with five showing overt clinical signs of the disease. Diagnosis was confirmed morphologically, serologically and by transmission studies. Since six of these animals were born in the colony, a means of transmission was sought and it was determined that multiple use of a syringe to administer intravenous anesthesia was the probable means of cross transmission.