Spontaneous gross and microscopic lesions were studied in 82 perinatal and neonatal monkeys of various species. Ninety-seven lesions were found in the body systems examined. The system at greatest risk was the respiratory system (33 lesions), at the least risk, the cardiovascular system (four lesions). Lesions were inflammatory, degenerative, vascular, and of other types, such as intrauterine aspiration and congenital anomalies. Differences in the type and distribution of lesions in the various systems were found between premature and mature infants.
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