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Bilateral cervical masses were observed in two newborn, male, rhesus macaques. The clinical diagnosis was congenital goiter. Thyroid function screening tests revealed that the affected monkeys had normal triiodothyronine levels, low thyroxine values, and elevated thyroid-stimulating hormone levels. Radioactive iodine uptake and perchlorate discharge tests indicated a postorganification defect. A third, male, rhesus macaque, stillborn after a prolonged gestation, also had bilateral cervical masses. Necropsy and histopathology examinations confirmed the masses were enlarged, hyperplastic thyroid glands. Each affected infant had the same parents.

Stool specimens collected systematically from a group of Celebes black macaques (Macaca nigra) with a high incidence of diarrhea were examined microbiologically. Numerous isolates of Shigella flexneri, Campylobacter jejuni and pathogenic Escherichia coli were recovered. Previous parasitology reports had revealed that the majority of the animals had Balantidium coli. Subsequently, the group was treated with trimethoprim-sulfamethoxazole, erythromycin and tetracycline. After treatment, Shigella flexneri was not detected in the stool of any animal for 1 year, and the clinical condition of the group was improved. Reduced recovery rates were obtained with other enteric pathogens.