Serogroup | 1993 | 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | Total |
---|---|---|---|---|---|---|---|---|
NG, non-serogroupable. | ||||||||
A | – | – | 2 | – | – | – | – | 2 |
B | 89 | 77 | 54 | 63 | 49 | 47 | 61 | 440 |
C | 35 | 33 | 28 | 42 | 42 | 62 | 59 | 301 |
Y | – | 2 | 1 | 2 | 2 | 3 | 2 | 12 |
W135 | 3 | – | 1 | – | 2 | 2 | 2 | 10 |
X | – | – | – | – | 1 | 2 | 3 | 6 |
Z | – | – | 1 | – | – | – | – | 1 |
29E | – | – | – | 1 | – | – | – | 1 |
NG | – | 2 | 3 | – | – | 6 | 4 | 15 |