Table 2 Source of isolation, distribution and caharacteristics of class 1 integron gene cassettes in E. coli blood culture isolates (strain collections 1 and 2) and in gastrointestinal E. coli isolates (strain collection 3).
Source and year of isolation1 | No. of cassette positive isolates/total no. of tested isolates | Size of integron gene cassette (kb) | Genes in cassettes2 |
|---|---|---|---|
Strain collection 1 (1998–1999) | 20/131 | ||
B | 8/36 | ||
5 | 0.7 | dfrA5 | |
1 | 1.0 | aadA1 | |
1 | 1.6 | dfrA17-aadA5 | |
1 | 2.0 | oxa1-aadA1 | |
O | 6/38 | ||
2 | 1.0 | aadA1 | |
2 | 1.6 | dfrA17-aadA5 | |
2 | 1.6 | dfrAI-aadA1 | |
Th | 1/33 | ||
1 | 0.7 | dfrA5 | |
Tø | 5/24 | ||
1 | 0.8 | dfrA7 | |
2 | 1.0 | aadA1 | |
2 | 1.6 | dfrA17-aadA5 | |
Strain collection 2 (1991–92; 1995–96) | 18/53 | ||
M (1991–92) | 3/13 | ||
1 | 1.0 | aadA1 | |
2 | 1.6 | dfrAI-aadA1 | |
M (1995–96) | 8/21 | ||
1 | 0.7 | dfrA5 | |
2 | 1.0 | aadA1 | |
3 | 1.6 | dfrA17-aadA5 | |
2 | 1.6 | dfrAI-aadA1 | |
R (1991–92) | 5/8 | ||
2 | 0.7 | dfrA5 | |
1 | 1.0 | aadA1 | |
1 | 1.6 | dfrAI-aadA1 | |
1 | 2.0 | oxa1-aadA1 | |
R (1995–96) | 2/11 | ||
1 | 1.9 | aadA2-linF | |
1 | 2.2 | dfrB2-aadA1-catB2 | |
Strain collection 3 3 (2000–2001) | 23/54 | ||
12 | 0.7 | dfrA7 | |
2 | 0.8 | dfrA7 | |
2 | 1.0 | aadA1 | |
1 | 1.6 | dfrA17-aadA5 | |
3 | 1.6 | dfrAI-aadA1 | |
1 | 0.15; 1.6 | No cassette; dfrA17-aadA5 | |
2 | 1.8 | dfrA12-aadA2 |