Table 2.
Pairwise comparisons of nucleotide sequences of S1 genes of our 18 Mass type isolates with those of pathogenic M41 and H120 vaccine strains.
| Strain | 41 | 81 | 102 | 112 | 129 | 138 | 147 | 162 | 187 | 197 | 206 | 301 | 349 | 377 | 382 | 385 | 389 | 391 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| H120 | C | G | C | G | T | G | T | T | T | C | T | T | C | T | C | C | C | A | ||
| Other 17 isolates | C | G | C | G | T | G | T | T | T | C | T | T | C | T | C | C | C | A | ||
| I1124/16 | C | G | C | A | T | T | A | T | T | C | T | C | C | T | C | C | T | A | ||
| M41 | T | T | T | A | C | T | A | C | C | T | C | C | T | G | A | A | T | T | ||
| 614 | 669 | 737 | 846 | 861 | 1017 | 1063 | 1104 | 1119 | 1136 | 1172 | 1259 | 1428 | 1435 | 1451 | 1551 | 1566 | 1578 | 1625 | 1631 | |
| G | G | C | A | C | T | G | C | C | T | A | A | C | A | A | C | T | C | G | A | |
| G | G | C | A | C | T | C | C | C | T | A | A | C | A | A | C | T | C | G | A | |
| A | A | T | T | T | C | C | T | T | T | A | A | T | G | A | T | C | C | A | C | |
| A | A | T | T | T | C | C | T | T | C | T | G | T | G | C | T | C | T | A | C | |
We compared the nucleotide sequences of S1 genes of our 18 Mass type isolates with those of pathogenic M41 and H120 vaccine strains. Of the 38 mutations, 19 were the same in the pathogenic M41 strain and 19 in the vaccine H120 strain. Nucleotide positions correspond to those in the sequence of the IBVH120 S1 gene. GenBank accession numbers are the same as those shown in Supplemental Table 1.