CD19 and Huntington disease: Following CpG stimulation, total CD19+cells were different among groups (Kruskal-Wallis p = 0.0098), and in particular, patients with isolated CD showed a significant reduction of this phenotype as compared to the one observed in HD patients and in patients with HT + CD (1.6% vs 3.9% or 4.2%; both p < 0.05).