CD19 and psoriasis: The proportion of CD19+CD40+ B cells in PBMCs from patients with psoriasis vulgarisat the active stage (P<0.001), but not the stationary stage, and all otherdifferent psoriasis subtypes (all P<0.01) was upregulated compared with HCs.Moreover, the proportion of CD19+CD40+ B cells in PBMCs from patients with psoriasisvulgaris at the active stage was higher than psoriasis vulgaris at the stationarystage (P<0.01).