TABLE 1.
Various typing methods for identification of S. aureus strains from bovine milk, skin, and milking equipment
| Technique | Collec- tiona | No. of typesb | Type- ability (%) | Simpson index of discriminationc (95% CI) |
|---|---|---|---|---|
| PFGE (main types only) | Full | 24 | 100 | 0.84 (0.81-0.87) |
| PFGE (main and subtypes) | Full | 24 + 17 | 100 | 0.92 (0.90-0.94) |
| PFGE (main types only) | BT | 20 | 100 | 0.80 (0.74-0.86) |
| PFGE (main and subtypes) | BT | 20 + 13 | 100 | 0.90 (0.88-0.93) |
| Phage typing | Full | 21 | 92.4 | 0.76 (0.71-0.82) |
| Phage typing | BT | 16 | 93.0 | 0.67 (0.58-0.76) |
| Binary typing | BT | 20 | 97.2 | 0.86 (0.81-0.90) |
a
Full, full collection of 225 samples; BT, subset of 142 samples used for binary typing.
b
For PFGE with distinction of subtypes, the number of main types + number of subtypes is given.
c
Point estimate and 95% confidence interval (CI) with calculation as described by Grundmann et al. (11) based on data from typeable isolates.