Table 2 AST results of the Alfred 60 AST™ system compared to BD Phoenix™ system for 301 Gram-negative and 86 Gram-positive organisms included in the study. Column 2 refers to the total number of susceptibility tests done with both methods; colum 3 refers to the number of tests for which there was agreement between both tests. S = sensitivie, I = intermediate, R = resistant, CA = Categorical agreement, 95% CI = 95% confidence interval. CoNS – Coagulase negative staphylococcus, 95%CI- 95% confidence interval
No. of discrepancies | |||||||
|---|---|---|---|---|---|---|---|
No. of Isolates | No. of AST results | No. of CA | CA % (95% CI) | Very major | Major | Minor | |
Gram-negative organisms | |||||||
E.coli | 209 | 1291 | 1242 | 96 (95–97) | 9 | 36 | 4 |
Klebsiella spp | 57 | 351 | 330 | 94 (91–96) | 10 | 11 | 1 |
P.mirabillis | 12 | 79 | 69 | 87 (78–84) | 6 | 3 | 0 |
P.aeruginosa | 10 | 61 | 58 | 95 (86–91) | 0 | 3 | 0 |
E.cloacae | 7 | 43 | 37 | 86 (72–95) | 0 | 6 | 0 |
M.morgani | 6 | 38 | 36 | 95 (82–99) | 0 | 2 | 0 |
Overall Gram-negative | 301 | 1863 | 1772 | 95 (94–96) | 31 | 55 | 5 |
Gram-positive organisms | |||||||
S.epidermidis | 26 | 104 | 98 | 94 (88–98) | 3 | 2 | 1 |
S.aureus | 21 | 84 | 66 | 79 (68–87) | 1 | 17 | 0 |
S.hominis | 15 | 60 | 54 | 90 (79–96) | 2 | 4 | 0 |
CoNS other | 13 | 52 | 48 | 92 (81–97) | 1 | 3 | 0 |
E.faecalis | 10 | 30 | 27 | 93 (73–98) | 0 | 3 | 0 |
E.faecium | 1 | 3 | 2 | 67 (10–100) | 0 | 0 | 1 |
Overall Gram-positive | 86 | 333 | 295 | 89 (85–92) | 7 | 29 | 2 |