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Serum cytokine levels obtained within 24 h of endotracheal intubation in patients <5 years of age with severe pneumonia and respiratory failure requiring mechanical ventilation and classified by age. TNF, tumour necrosis factor; GM-CSF, granulocyte/macrophage colony-stimulating factor; IL, interleukin; IFN, interferon; Statistically significant differences were observed in IL-10 levels only between the <6 months and 6–12 months groups (P < 0.05; Mann–Whitney U-test).
