Analysis of inflammatory cell responses following secondary heterologous influenza virus challenge. Levels of neutrophils (A), monocytes (B), NK cells (C), dendritic cells (D), alveolar macrophages (E), and eosinophils (F) in the lungs of nonasthmatic:PR8/CA04 and asthmatic:PR8/CA04 mice on days 3 and 6 post-CA04 challenge. The data represent means ± SD of results for 8 to 9 mice/group from two independent experiments.