A revolution in the basic understanding of immunology occurred in the late 1980s with the discovery that CD4+ helper T cells were not a homogeneous population but could be divided into Th1 and Th2 subsets based on their cytokine profiles. 20 years later the field of T cell subset phenotype and function remains fast moving with the recently demonstrated existence of T regulatory and Th17 cells adding extra layers of complexity. The meeting will explore current ideas about the roles played by these varied T cells subsets in a variety of parasitic infections with presentations from leaders in the field.