TABLE 3.
Comparison of emm type distribution among invasive group A streptococcal isolates in Alaska between 2001–2005, 2006–2009, and 2010–2013
| Descriptor | 2001–2005 (n = 121) | 2006–2009 (n = 113) | 2010–2013 (n = 188) |
|---|---|---|---|
| No. of emm types | 22 | 28 | 36 |
| Most common emm type (%) | 41 (12) | 82 (18) | 49 (15) |
| 3 (12) | 1 (13) | 1 (11) | |
| 12 (11) | 108 (12) | 89 (11) | |
| % of cases (top 5 emm types) | 51 (62/121) | 57 (64/113) | 53 (99/188) |
| % of cases (top 10 emm types) | 80 (97/121) | 74 (84/113) | 80 (150/188) |
| Simpson's diversity index | 0.92 | 0.90 | 0.93 |
| % covered by 26-valent vaccine | 72.7 (88/121) | 39.8 (45/113) | 55.3 (104/188) |
| % covered by 30-valent vaccine | 80 (97/121) | 79.6 (90/113) | 75.5 (142/188) |
| Most common emm type(s) not in either vaccine | 41 | 108, 9 | 108, 1-2.3, 91 |