CD4 and Gerstmann syndrome: Overall, our results confirm that in addition to (virtually) undetectable B-cells and decreased serum Ig levels (1), GS patients also have decreased counts of circulating CD4+ T-cells (2, 3, 46, 47), NK-cells (2, 22, 46, 48, 49), basophils (50) and neutrophils (2, 3, 46), associated with a significant expansion in blood of TCRγδ+ T-cells (51).