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HISTOPATHOLOGY OF LYMPHOID ORGANS IN NEWBORN INFANTS WITH THYMIC INVOLUTION

Thymic involution was found In 16 of 29 newborn infants examined regardless of cause of death. Of the newborn infants with thymic involution, 5 newborn infants showed cellular depletion in thymus‐dependent areas (TDA) of the spleen and lymph nodes. In these infants, the thymic involutions were generally marked and the survival periods were 5 days long or more. The conditions for manifestation of the cellular depletion in TDA were discussed in connection with the results reported in animals.