Table 1.
Chromogenic medium | Organism(s) tested (n) | Proportion of ESBL producers in total tested strains (%) | Incubation time (h) | Comparator(s) | Sensitivity (%) | Specificity (%) | Reference |
---|---|---|---|---|---|---|---|
chromID ESBL | E. coli (334) | 291/505 (57.6) | 18–24 | EbSA | 97.3 | 93.9 | 16 |
Klebsiella spp. (124) | |||||||
Proteus spp. (42) | |||||||
Salmonella spp. (3) | |||||||
Shigella spp. (2) | |||||||
Enterobacter spp. (90) | 65/137 (47.4) | 18–24 | EbSA | 98.5 | 44.3 | 16 | |
Citrobacter spp. (30) | |||||||
Morganella morganii (9) | |||||||
Serratia marcescens (6) | |||||||
Providencia spp. (2) | |||||||
Enterobacteriaceae (156) | 98/200 (49) | 24 | Brilliance ESBL | ND | ND | 10 | |
Gram-negative nonfermenters (44) | |||||||
Enterobacteriaceae and Pseudomonas spp. (150) | 101/150 (67.3) | ND | CHROMagar CTX, CHROMagar ECC + CTXc or CAZc | 98 | 25.5 | 21 | |
E. coli (72) | 99/114 (86.8) | 18–24 and 48 | Vitek 2, Phoenix | 95.8 | 10.5 | 8 | |
Klebsiella pneumoniae (21) | |||||||
K. oxytoca (4) | |||||||
Enterobacter cloacae (11) | |||||||
Enterobacter aerogenes (1) | |||||||
S. marcescens (1) | |||||||
Citrobacter koseri (1) | |||||||
Proteus mirabilis (1) | |||||||
Proteus vulgaris (1) | |||||||
M. morganii (1) | |||||||
Brilliance ESBL | Enterobacteriaceae (156) | 98/200 (49) | 24 | chromID ESBL | ND | ND | 10 |
Gram-negative nonfermenters (44) | |||||||
CHROMagar CTX | Enterobacteriaceae and Pseudomonas spp. (150) | 70b/150 (46.6) | ND | chromID ESBL, CHROMagar ECC + CTXc or CAZc | 100 | 64.2 | 21 |
CTX, cefotaxime; CAZ, ceftazidime; ND, not described.
CTX-M producers.
Cefotaxime or ceftazidime was incorporated at concentrations of 1, 2, 4, and 8 μg/ml.