TABLE 3.

Comparison of the degrees of lymphocyte depletion of different lymphoid tissues with respect to the apparent amount of PCV2 DNA genome observed after ISH

Level of PCV2 DNA (no. of pigsb)	No. of PCV2-positive pigs showing indicated degree of lymphocyte depletion in indicated tissuea
	Superficial inguinal LNc				Mesenteric LN				Peyer's patches				Tonsil				Spleen (PALSd)
	B zonee		T zonef		B zone		T zone		B zone		T zone		B zoneg		T zoneh
	1	2 or 3	1	2 or 3	1	2 or 3	1	2 or 3	1	2 or 3	1	2 or 3	1	2 or 3	1	2 or 3	1	2 or 3
Low (7)	4	0	0	0	3	0	1	0	1	1	1	1	3	0	1	0	1	0
High (17)	0	15	8	9	0	17	1	16	0	16	1	16	1	13	4	9	5	7

^aScore of lymphocyte depletion degree: 1, slight; 2, moderate; 3, severe.

^bTotal number of pigs, including those not showing lymphocyte depletion.

^cLN, lymph node.

^dPALS, periarteriolar lymphoid sheaths; P = 0.07.

^eB zone, B-cell-dependent area.

^fT zone, T-cell-dependent area.

^gP < 0.01; for other groups, P < 0.001, except as indicated.

^hP < 0.05.