TABLE 4.
ICPI scores for parental rBC and rGBT and their polymerase-associated protein gene chimeras
| Virus | ICPI scorea |
|---|---|
| rBC | 1.58 |
| rBC-GBT(N) | 1.62 |
| rBC-GBT(P) | 1.60 |
| rBC-GBT(L) | 1.71** |
| rBC-GBT(N+P+L) | 1.75*** |
| rBC-GBT(Tr) | 1.61 |
| rGBT | 1.91 |
| rGBT-BC(N) | 1.88 |
| rGBT-BC(P) | 1.90 |
| rGBT-BC(L) | 1.83** |
| rGBT-BC(N+P+L) | 1.78*** |
| rGBT-BC(Tr) | 1.90 |
a
Pathotype definitions by ICPI: velogenic strains approach the maximum score of 2.00, whereas lentogenic strains give values close to 0. Asterisks indicate the statistical significance of the ICPI score of a chimeric virus compared to the parental virus of that group; P values were calculated based on a two-tailed, unpaired t test (95% confidence levels). ***, P = 0.0001 to 0.001, extremely significant; **, P = 0.001 to 0.01, very significant.