TABLE 3.
VT type by Verotox-F assay | No. of strains | VT titera
|
||
---|---|---|---|---|
Range | Median | Geometric mean | ||
VT1 | 17 | 8–512 | 64 | 47 |
VT2 | 31 | 4–512 | 32 | 26 |
VT1 + VT2 | 17 | 8–128 (VT1) | 32 | 32 |
4–512 (VT2) | 32 | 35 |
The VT titer by the Verotox-F assay was defined as the reciprocal of the highest filtrate dilution that caused agglutination of the respective latex reagent overnight.