Table 1.
Phylogenetic group affiliation of integron-positive and -negative E. coli isolates from the Warta river
| Phylogenetic group (n) | Class 1 integron presence | P valuec | |
|---|---|---|---|
| intI1-positive, %a (n b) | intI1-negative, % (n) | ||
| A (92) | 45.7 (42) | 54.3 (50) | 0.248 |
| A0 (23) | 34.8 (8) | 65.2 (15) | 0.120 |
| A1 (69) | 49.3 (34) | 50.7 (35) | 0.880 |
| B1 (37) | 56.8 (21) | 43.2 (16) | 0.360 |
| B2 (21) | 57.1 (12) | 42.9 (9) | 0.488 |
| B22 (7) | 85.7 (6) | 14.3 (1) | 0.118 |
| B23 (14) | 42.9 (6) | 57.1 (8) | 0.579 |
| D (42) | 50.0 (21) | 50.0 (21) | 1.000 |
| D1 (24) | 33.3 (8) | 66.7 (16) | 0.081 |
| D2 (18) | 72.2 (13) | 27.8 (5) | 0.081 |
aPercentage of strains within a phylogenetic group/subgroup
bNumber of strains
c P value calculated in Pearson’s χ2 test or Fisher’s exact test (when cell frequency ≤5)