Differences in peripheral-blood lymphocyte subsets and activation mark
ers were detected in patients with bakers' asthma compared to normal c
ontrols. Most asthmatic bakers were characterized by increased numbers
of CD4+/HLA-DR+ T cells, by CD8+/HLA-DR+ T cells, by CD4-/CD25+ cells
as well as CD19+/CD23+ B cells. Furthermore asthmatic bakers showed e
levated serum levels of soluble IL-2 receptor (sCD25) and soluble low-
affinity Fc IgE receptor. These differences in the distribution and ac
tivation state of peripheral-blood lymphocyte suggest an important rol
e of T cells in the pathogenesis of bakers' asthma.