Table I.

Findings for piglets vaccinated or not vaccinated against Porcine circovirus type 2 (PCV2) on 3 farms affected by postweaning multisystemic wasting syndrome

	Mean ± standard deviation or proportion
	Vaccinated animals			Non-vaccinated animals
Variable	Farm A	Farm B	Farm C	Farm A	Farm B	Farm C
Body weight (kg); age (week)
1	2.9 ± 0.17	3.0 ± 0.18	2.9 ± 0.43	3.0 ± 0.42	2.9 ± 0.31	2.9 ± 0.59
5	8.3 ± 1.4	9.2 ± 1.41	8.0 ± 1.62	8.4 ± 1.30	8.2 ± 2.1	7.1 ± 1.89
7	12.9 ± 1.91	14.6 ± 2.42	12.0 ± 2.64	11.7 ± 1.72	12.8 ± 2.40	11.1 ± 2.35
10	19.7 ± 2.47	26.0 ± 3.50	21.6 ± 3.95	18.2 ± 2.71	24.0 ± 3.45	18.3 ± 3.90
14	35.8 ± 5.85	46.6 ± 6.61	37.8 ± 6.80	32.7 ± 4.45	43.0 ± 4.92	33.6 ± 7.30
16	47.9 ± 7.88	59.2 ± 7.13	48.1 ± 5.75	43.5 ± 4.64	53.3 ± 4.22	39.3 ± 6.12
ADGa (kg/day); 5 to 16 week	0.52 ± 0.10c	0.65 ± 0.10c	0.52 ± 0.07c	0.45 ± 0.06	0.58 ± 0.06	0.42 ± 0.08
ADFb (kg/day); 5 to 16 week	1.04	1.21	0.95	1.04	1.22	1.01
Mortality rate	2/30	1/30	3/30d	6/30	6/30	12/30
Lymphoid lesion score	0.7 ± 0.48d	0.5 ± 0.53d	0.8 ± 0.4d	1.8 ± 0.92	1.4 ± 0.97	2.1 ± 0.74
PCV2-antigen score	12.2 ± 2.49d	21.9 ± 5.79d	31.1 ± 8.30d	61.3 ± 13.58	78.8 ± 16.58	74.4 ± 17.89

^aAverage daily weight gain.

^bAverage daily feed consumption.

^cSignificantly higher in the vaccinated animals than in the non-vaccinated animals (P < 0.05).

^dSignificantly lower in the vaccinated animals than in the non-vaccinated animals (P < 0.05).