Serogroup | Cerebrospinal fluid | Bacterial isolates | ||
---|---|---|---|---|
China | Korea | Vietnam | Vietnam | |
 | N (%) |  | N (%) | |
A | 0 | 0 | 0 | 0 |
B | 0 | 0 | 2 (9.1) | 10 (100) |
C | 0 | 1 (6.3) | 20 (90.9) | 0 |
W-135 | 1 (16.7) | 0 | 0 | 0 |
X | 3 (50.0) | 9 (56.3) | 0 | 0 |
Y | 2 (33.3) | 6 (37.5) | 0 | 0 |
Total | 6 (100) | 16 (100) | 22 (100) b | 10 (100) |