TABLE 4.
Prevalence of SAg genes among the five most frequent emm types of invasive and noninvasive group A streptococcal isolates
| SAgs gene | Prevalence (%)a
|
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|
|
emm-1
|
emm-4
|
emm-6
|
emm-12
|
emm-28
|
||||||
| Inv (n = 65) | Non (n = 35) | Inv (n = 10) | Non (n = 56) | Inv (n = 7) | Non (n = 50) | Inv (n = 11) | Non (n = 58) | Inv (n = 40) | Non (n = 43) | |
| speA | 74b | 97b | 0 | 2 | 14 | 4 | 9 | 12 | 23b | 7b |
| speC | 37b | 11b | 100 | 95 | 86 | 96 | 82 | 84 | 75 | 86 |
| speH | 3 | 6 | 80b | 29b | 0 | 12 | 64 | 81 | 18 | 9 |
| speI | 2 | 3 | 0 | 0 | 0 | 0 | 27 | 19 | 0 | 2 |
| ssa | 15b | 3b | 100 | 86 | 14 | 18 | 45b | 14b | 25b | 5b |
a
The GAS isolate may carry multiple SAg genes. Inv, invasive group A streptococcal isolates (total n = 200); Non, noninvasive group A streptococcal isolates (from patients with tonsillitis and impetigo and from asymptomatic carriers) (total n = 352).
b
P < 0.05 by comparison of invasive and noninvasive isolates, as determined by the chi-square test.