FIG. 1.
Analysis by M-PCR of strains positive for the AIDA system. (A) Samples from PCR of strains obtained from pigs diagnosed with ED or PWD. (B) Samples from PCR of strains isolated from pigs which at the time of sampling showed no ED or PWD. a, fragment amplified with primers UN19 and UN20 derived from orfA; b, fragment amplified with primers UN23 and UN24 derived from orfB in the region coding for the AIDAC part of the AIDA system; c, fragment amplified with primers UN21 and UN22 derived from orfB in the region coding for the AIDA-I part of the AIDA system.