Table 3.

Significant associations between pairs of pathogens

Associated pathogens	P value∗	Spearman-rho factor
Animals with CBP (n = 148)
PCV2 and P. multocida (+)†	0.017	0.067
PCV2 and S. suis	0.021	0.088
PCV2 and M. hyopneumoniae	0.012	−0.038
PCV2 and PRRSV	0.013	0.048
PCV2 and PCMV	0.025	0.104
P. multocida (++) and M. hyorhinis	0.050	0.157
S. suis and M. hyopneumoniae	0.022	0.097
PRRSV and M. hyopneumoniae	0.014	0.052
Control animals (n = 60)
PCV2 and S. suis	0.032	0.105

^∗P values were tested by the Fischer's exact test and the degree of association was calculated by the Spearman-rho factor-test.

^†Weak growth of P. multocida on the plate (+).