. 2007 Dec 19;15(3):397–401. doi: 10.1128/CVI.00416-07

TABLE 3.

Microscopic lesion scores for lung (interstitial pneumonia) and lymphoid tissues (overall lymphoid severity)

Group	Mean (SE) score^a
Group	Interstitial pneumonia^b	Overall lymphoid severity^c
VAC-NEG	0.11 (0.11)^A	0.48 (0.18)^A
VAC-POS	0.38 (0.15)^A	0.69 (0.22)^A
NVAC-CNEG	0.87 (0.19)^B	3.76 (0.58)^B
NVAC-CPOS	0.27 (0.15)^A	2.77 (0.51)^B

Significantly different (P < 0.05) group means within each column are indicated by different superscript letters (A or B).

Possible scores for interstitial pneumonia ranged from 0 (normal) to 6 (severe diffuse interstitial pneumonia).

The mean cumulative value from seven lymphoid tissues (tonsil, spleen, and five lymph nodes) is reported (possible range, 0 to 9) and includes scores for lymphoid depletion (possible range, 0 to 3), inflammation (possible range, 0 to 3), and the amount of PCV2 (possible range, 0 to 3). Possible cumulative scores for overall severity included normal (score of 0), mild (score range, 1 to 3), moderate (range, 4 to 6), and severe (range, 7 to 9).