Intraleukocytic bactericidal activity in patients receiving corticosteroid and radiation therapy, and in patients with diabetes mellitus.

Bactericidal activities of peripheral white blood cells obtained from patients and from healthy persons were examined in vitro. The results obtained are summarized as follows. 1. Peripheral white blood cells from patients receiving corticosteroid and radiation therapy showed decreased levels of intracellular bactericidal activities against Staphylococcus aureus. The leukocytes from almost all patients examined displayed intense activities of intracellular bacterial killing against Streptococcus pyogenes. 2. Only polymorphonuclear leukocytes (PMNs) and macrophages obtained from patients in severe stages of diabetes mellitus exhibited decreased levels of intracellular bactericidal activities against S. aureus. 3. The leukocytes from all patients examined exhibited the same levels of intracellular bactericidal effects against S. pyogenes as leukocytes from healthy persons. 4. Pseudomonas aeruginosa, which was phagocytized by PMNs obtained from healthy persons, demonstrated a remarkable degree of resistance to any intracellular bactericidal effect.

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