B) Distribution of strains across the 4 lineages.
| Lineage | No. of strains |
|---|---|
| LIN-1 (EAI) | 141 (70%) |
| LIN-2 (Beijing) | 22 (11%) |
| LIN-3 (CAS) | 32 (16%) |
| LIN-4 (Euro-American) | 6 (3%) |
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