Table 5.
sigB allelic-type diversity stratified by Listeria species and sample environment among isolates from 2001 and 2002
| Species | Simpson index of diversity for isolates from indicated environment (no. of isolates)a |
||
|---|---|---|---|
| Natural | Urban | All | |
| L. monocytogenes | 0.295 (13)† | 0.722 (67)† | 0.678 (80) |
| L. seeligeri | 0.737 (144)† | 0.907 (99)† | 0.832 (234) |
| L. marthii | 0.833 (4) | NA (0) | 0.833 (4) |
| L. welshimeri | 0.867 (52) | 0.931 (22) | 0.902 (74) |
| L. innocua | NA (1) | 0.935 (49) | 0.935 (50) |
| Total | 0.871 (214)† | 0.958 (228)† | 0.939 (442) |
a
“†” marks Simpson indices of discrimination for urban and natural areas that have nonoverlapping 95% confidence intervals. NA, not applicable (Simpson's index of discrimination cannot be determined for fewer than two isolates).