Isolate characteristic | Total no. of isolates | No. (%) of isolates by subgroup | P value | |||||||
---|---|---|---|---|---|---|---|---|---|---|

I (n = 2) | II(n = 2) | III (n = 1) | IV (n = 1) | V (n = 1) | VI (n-46) | VII (n = 1) | VIII (n = 1) | |||

Beijing strain | 47 | 0 | 0 | 0 | 0 | 1 | 45 | 1 | 0 | <0.0001 |

Clustered | 16 | 0 | 0 | 0 | 0 | 0 | 16 | 0 | 0 | 0.731 |