Study of some statistics used to measure gene diversity according to the size and the population structure of strain samples.

a: Number of different STs in the population studied. b: Standard deviation (SD) values from datasets containing more than 1500 STs were not calculated due to the limitations of the DnaSP software. c: New πMAX value and πMAX/π ratio after removal of 7 STs are indicated in parentheses. d: New πMAX value and πMAX/π ratio after removal of 17 STs are indicated in parentheses. e: New πMAX value and πMAX/π ratio after removal of 22 STs are indicated in parentheses. f: New πMAX value and πMAX/π ratio after removal of ST80 are indicated in parentheses.