TABLE 4.
Distribution of isolates on 133 WA farms according to genetic similarity based on molecular type
| Genetic classification of isolates on farms | No. (%) of farms for indicated typing methoda |
|
|---|---|---|
| PFA | IrsT | |
| Genetically identical isolates | 41 (30.8) | 31 (26.3) |
| Genetically similar isolates (clonal) | 27 (20.3) | 24 (20.3) |
| Genetically dissimilar isolates | 65 (48.9) | 63 (53.4) |
a
For PFA, n = 133 farms; for IrsT types, n = 118 farms. PFA, molecular type using restriction enzyme ApaI and PFGE method; IrsT, molecular type using primer PXT in the IRS-PCR method. Data taken from 133 farms from which more than one isolate was selected for molecular typing.