TABLE 7.
Percentage of isolates carrying resistance determinants
| Resistance determinanta | % of isolates in waterway or location |
|||||||
|---|---|---|---|---|---|---|---|---|
| A | C | G | US | LS | T | X2 | X3 | |
| LGI-2 (50) | 10.0 | 18.0 | 24.0 | 18.0 | 6.0 | 20.0 | 4.0 | 0 |
| cadA1C1 (27) | 0 | 11.1 | 7.4 | 0 | 11.1 | 66.7 | 3.7 | 0 |
| cadA2C2 (17) | 0 | 41.2 | 0 | 0 | 11.8 | 47.1 | 0 | 0 |
| cadA3C3 (10) | 0 | 60.0 | 0 | 10.0 | 0 | 30.0 | 0 | 0 |
| brcABC (18) | 0 | 27.8 | 5.6 | 0 | 16.7 | 50.0 | 0 | 0 |
| SSI-1 (156) | 12.2 | 14.7 | 23.1 | 5.1 | 5.8 | 23.1 | 7.1 | 8.3 |
a
LGI-2 (Listeria genomic island 2) encodes stress determinants for cadmium and arsenic resistance on a genomic island. cadA1A2, cadA2C2, and cadA3C3 encode extrachromosomal cadmium resistance determinants. The brcABC genes encode resistance determinants for benzalkonium chloride. SSI-1 (stress survival islet 1) is involved in growth under stressful conditions of low pH and high salt. The number in parentheses following the genetic identification is the total number of isolates carrying intact copies of the genes.