Table II.

Evidence of M. hyopneumoniae in the different groups at slaughter

Groupa	Average lung lesion score	Frequency of affected lungsb (%)	Frequency of DNA detectionc (%)	Average adjusted optical density of antibodiesd
1	12.56	83.0	100	0.685
2	1.30	53.3	79.3	0.216
3	5.70	74.0	100	0.623
4	4.45	70.0	100	0.563
5	5.51	81.5	100	0.476
6	1.07	39.3	10.7	0.122
7	4.27	55.2	100	0.443
8	7.36	80.0	100	0.444
9	3.04	52.0	86.2	0.390
10	8.06	86.6	100	0.284
11	7.30	80.0	71.8	0.940
12	2.38	44.0	15.0	0.192
15	1.15	34.4	25.0	0.117
16	7.06	63.3	48.3	0.442
17	0	0	35.7	0.427
18	0.23	6.6	33.3	0.275
19	1.06	18.8	46.0	0.229
20	1.81	40.1	40.9	0.232
Mean	4.12	53.5	66.2	0.394
Standard error	0.80	6.3	8.0	0.050

^aGroups 13 and 14 were eliminated from the study for marketing reasons.

^bLungs with lesions associated with M. hyopneumoniae infection.

^cIn bronchial swabs by nested polymerase chain reaction.

^dIn an enzyme-linked immunosorbent assay, a value of 0.24 being considered evidence of seroconversion.