Table 2. B cells (CD19⁺) and B-cell activation markers (CD69⁺ and CD95⁺) in peripheral blood mononuclear cells for surveys 1 and 2.

Surface antigen			Blood B cells
			controls	patients
			n = 27	n = 33
CD19+	(1)		8.7±2.3*	17.2±5.6*
			n = 14	n = 16
	(2)	CD69+	2.4±1.5*	2.3±3.0*
		CD95+	4.8±1.8*	11.3±3.8*

(1) n = 33 patients and 27 controls from both surveys.

(2) n = 16 patients and 14 controls from survey 2. Data are expressed in percentages of total events acquired with the FACSCalibur (10⁴ on average)±standard deviation.

^*Significant difference between controls and patients (P<0.05).