IL-10 influences bacterial burden during influenza,
co-infection. IL-10−/− mice received 100 PFU of influenza A PR/8/34, followed by challenge with S. aureus (USA 300) at 6 days post-influenza. Bacterial burden was assessed 24 hours following bacterial challenge (A), n = 4. Cellular inflammation was examined by differentials of total cells per milliliter in the BAL fluid (B), n = 4. *p < 0.05 C57BL/6 mice infected with S. aureus versus influenza, S. aureus. **IL-10−/− mice infected with influenza, S. aureus compared to WT mice infected with influenza, S. aureus. All data are reported as means ± SEM for each group by unpaired t test.