CD4 and asthma: In a study of bariatric surgery patients with and without asthma (N = 27 and 39, respectively), there were no changes 12 months post-operatively in submucosal eosinophils, neutrophils, CD20+ B cells, macrophages, CD4+ T cells, or CD8+ T cells, though the number of mast cells was found to be decreased in asthmatics [31].