Table 3. Positive rates of modified Hodge tests of the variable conditions according to species distribution.
| Species and carbapenemase activity (N of isolates) | N (%) of positive results with two cut offs of indentation levels at each combinations of variables | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| ETP/MHA/0.5 | ETP/MAC/0.5 | MEM/MHA/0.5 | MEM/MAC/0.5 | ETP/MHA/0.05 | ||||||
| ≥2 mm | ≥3 mm | ≥2 mm | ≥3 mm | ≥2 mm | ≥3 mm | ≥2 mm | ≥3 mm | ≥2 mm | ≥3 mm | |
| Klebsiella pneumoniae (74) | ||||||||||
| MBL carbapenemase (14)* | 4 (28.6) | 1 (7.1) | 11 (78.6) | 8 (57.1) | 1 (7.1) | 0 | 10 (71.4) | 4 (28.6) | 1 (7.1) | 1 (7.1) |
| AmpC-CH (25) | 0 | 0 | 1 (4.0) | 1 (4.0) | 0 | 0 | 1 (4.0) | 0 | 0 | 0 |
| Other CRE (35) | 4 (11.4) | 1 (2.9) | 4 (11.4) | 1 (2.9) | 1 (2.9) | 0 | 4 (11.4) | 1 (2.9) | 4 (11.4) | 1 (2.9) |
| Other species with NDM-1 (11)* | 9 (81.8) | 5 (45.5) | 6 (54.5) | 5 (45.5) | 5 (45.5) | 4 (36.4) | 6 (54.5) | 5 (45.5) | 7 (63.6) | 6 (54.5) |
| Enterobacter cloacae (29) | ||||||||||
| MBL carbapenemase (7) | 6 (85.7) | 5 (71.4) | 1 (14.3) | 1 (14.3) | 5 (71.4) | 3 (42.9) | 1 (14.3) | 1 (14.3) | 6 (85.7) | 5 (71.4) |
| AmpC-CH (21) | 2 (9.5) | 0 | 5 (23.8) | 1 (4.8) | 0 | 0 | 0 | 0 | 2 (9.5) | 1 (4.8) |
| Other CRE (1) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Enterobacter aerogenes (11) | ||||||||||
| AmpC-CH (9) | 6 (66.7) | 4 (44.4) | 8 (88.9) | 7 (77.8) | 2 (22.2) | 1 (11.1) | 3 (33.3) | 1 (11.1) | 5 (55.6) | 5 (55.6) |
| Other CRE (2) | 1 (50.0) | 1 (50.0) | 1 (50.0) | 1 (50.0) | 1 (50.0) | 0 | 0 | 0 | 1 (50.0) | 0 |
| Escherichia coli (6) | ||||||||||
| AmpC-CH (3) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Other CRE (3) | 1 (33.3) | 0 | 1 (33.3) | 1 (33.3) | 0 | 0 | 1 (33.3) | 0 | 0 | 0 |
| Citrobacter freundii (7) | ||||||||||
| MBL carbapenemase (7) | 6 (85.7) | 4 (57.1) | 3 (42.9) | 2 (28.6) | 4 (57.1) | 3 (42.9) | 5 (71.4) | 2 (28.6) | 5 (71.4) | 4 (57.1) |
| Serratia marcescens (6) | ||||||||||
| MBL carbapenemase (4) | 3 (75.0) | 3 (75.0) | 4 (100.0) | 3 (75.0) | 3 (75.0) | 3 (75.0) | 3 (75.0) | 3 (75.0) | 3 (75.0) | 3 (75.0) |
| Other CRE (2) | 1 (50.0) | 0 | 1 (50.0) | 1 (50.0) | 1 (50.0) | 0 | 1 (50.0) | 1 (50.0) | 1 (50.0) | 1 (50.0) |
| Klebsiella oxytoca (1) | ||||||||||
| MBL carbapenemase (1) | 1 (100) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 (100) | 1 (100) |
| Morganella morganii (1) | ||||||||||
| AmpC-CH (1) | 0 | 0 | 1 (100) | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Providencia stuartii (1) | ||||||||||
| Other CRE (1) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
*MBL carbapenemase carried by Klebsiella pneumoniae was NDM-1, and other species than Klebsiella pneumoniae carrying NDM-1 comprised three Enterobacter cloacae, four Citrobacter freundii, three Serratia marcescens and one Klebsiella oxytoca.
Abbreviations: See Table 2.