Table 1. Number of wildlife versus dog isolates for lineages China I to China IV.
| Clade | Wildlife strains | Dog strains | Total strains |
| China I | 2 | 272 | 299 |
| China II | 15 | 60 | 83 |
| China III (Cosmopolitan) | 3 | 11 | 16 |
| China IV (Arctic-like) | 5 | 0 | 5 |
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