TABLE 3.
ICPI scores for parental rBC and rGBT and their envelope-associated protein gene chimeras
| Virus | ICPI scorea |
|---|---|
| rBC | 1.61 |
| rBC-GBT(M) | 1.58 |
| rBC-GBT(F) | 1.88*** |
| rBC-GBT(HN) | 1.71** |
| rBC-GBT(F+HN) | 1.80*** |
| rBC-GBT(M+F+HN) | 1.82*** |
| rGBT | 1.91 |
| rGBT-BC(M) | 1.85** |
| rGBT-BC(F) | 1.62*** |
| rGBT-BC(HN) | 1.88 |
| rGBT-BC(F+HN) | 1.78*** |
| rGBT-BC(M+F+HN) | 1.75*** |
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.