TABLE 2.
Number of types and Simpson's index of diversity of each typing method
| Typing method | No. of types found | Simpson's index of diversity (95% CI) | No. of isolates typed (% typeability) |
|---|---|---|---|
| T typing | 12 | 0.72 (0.68-0.77) | 316 (97)a |
| emm typing | 12 | 0.77 (0.74-0.81) | 325 (100) |
| T + emm typing | 33 | 0.81 (0.77-0.84) | 325 (100) |
| SmaI/Cfr9I 80% | 21 | 0.81 (0.78-0.84) | 325 (100) |
| MRPb | 3c | 0.51 (0.50-0.53) | 325 (100) |
| SfiI 68% | 21 | 0.81 (0.78-0.84) | 325 (100) |
| MLST | 10 | —d | 41 (100) |
a
Twelve strains were nontypeable. For the purpose of calculating the Simpson's index of diversity, they were all considered to belong to the same group.
b
MRP, macrolide resistance phenotyping.
c
Three macrolide resistance phenotypes were considered: M, cMLSB, and iMLSB.
d
—, Simpson's index of diversity was not calculated for the 41 isolates since it would not be comparable to the remaining results calculated for the entire 325-isolate data set.