CD28 and allergic rhinitis: Furthermore, several T cell subsets and their Absolute Counts, such as Terminally Differentiated CD4-CD8- T cell %T cell, CD28+ CD45RA+ CD8dim T cell %CD8dim T cell, Terminally Differentiated CD4-CD8 - T cell Absolute Count, and CD28+ CD45RA+ CD8+ T cell Absolute Count, are also protective against allergic rhinitis.