The agreement between Dot-ELISA and skim milk plate, Dot-ELISA and aer gene PCR, Dot-ELISA and 16S rDNA gene PCR were 79.2%(57/72), 91.6%(66/72), 81.9%(59/72) respectively.

• Dot-ELISA与脱脂奶平板法两者符合率为79.；2%25(57/72)；与aer基因扩增的符合率为91