Table 3 Frequencies of colistin resistance genes among different bacterial isolates from different isolation sources
Sample | Total isolates | Colistin resistance genes | |||
|---|---|---|---|---|---|
mcr-1 | mcr-2 | Both | |||
Resident birds | E. coli | 33 | 3 (9.1%) | 0 | 0 |
K. pneumoniae | 22 | 1 (4.5%) | 0 | 0 | |
K. oxytoca | 4 | 0 | 0 | 0 | |
P. aeruginosa | 8 | 3 (37.5%) | 1 (12.5%) | 0 | |
Total | 67 | 7 (10.4%) | 1 (1.4%) | 0 | |
Migratory birds | E. coli | 29 | 6 (20.6%) | 1 (3.4%) | 1 (3.4%) |
K. pneumoniae | 9 | 2 (22.2%) | 1 (11.1%) | 1 (11.1%) | |
K. oxytoca | 6 | 0 | 0 | 0 | |
P. aeruginosa | 11 | 3 (27.2%) | 0 | 0 | |
Total | 55 | 11 (20%) | 2 (3.6%) | 2 (3.6%) | |
Water | E. coli | 7 | 2 (28.5%) | 1 (14.2%) | 0 |
K. pneumoniae | 7 | 1 (14.2%) | 1 (14.2%) | 0 | |
K. oxytoca | 1 | 0 | 0 | 0 | |
P. aeruginosa | 3 | 0 | 0 | 0 | |
Total | 18 | 3 (16.6%) | 2 (11.1%) | 0 | |
Humans | E. coli | 10 | 1 (10%) | 1 (10%) | 0 |
K. pneumoniae | 15 | 1 (6.6%) | 2 (13.3%) | 1 (6.6%) | |
K. oxytoca | 2 | 0 | 0 | 0 | |
P. aeruginosa | 4 | 0 | 0 | 0 | |
Total | 31 | 2 (6.4%) | 3 (9.6%) | 1 (3.2%) | |