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Cell counts from bronchoalveolar lavage (BAL) fluid during secondary bacterial infection. Mice were infected with 1000 TCID50 of influenza virus or mock-infected with PBS and then challenged 7 d later with either PBS or 1 × 105 CFU of pneumococcus D39 (serotype 2). The average number of (A) leukocytes and (B) neutrophils in the BAL fluid of 4 mice per group is shown. *, P < 0.05 (analysis of variance with Dunn correction) versus other groups. Error bar, 1 standard deviation
