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Streptococcus pyogenes Strains Used in this Study
| Strains | Description | Reference |
|---|---|---|
| MGAS2221 | Representative epidemic serotype M1 isolate | 8, 17 |
| Δnga | MGAS2221 with a 1314-bp deletion in nga | This article |
| Δnga-ifs | MGAS2221 with a 1777-bp deletion that includes nga and ifs | This article |
| Δslo | MGAS2221 with a 473-bp deletion in slo | This article |
| Δnga-ifs-slo | MGAS2221 with a deletion that includes nga, ifs, and slo | 8 |
