Numbers of mucosa neutrophils, monocytes/macrophages, EG2+ eosinophils, and CD4+, CD8+, and CD20+ cells in subjects with asthma during acute infection were related to virus load, increasing airway reactivity, and worsening of asthma symptoms and lung function, whereas tryptase-positive mast cells were related to better lung function. Here, CD4 is linked to asthma.