From: Rapid optical determination of β-lactamase and antibiotic activity
S. aureusisolate # | β-LACTAMSE GENOTYPE (‘blaZ’PCR) | β-LACTAMASE PHENOTYPE | CEFAZOLIN SUSCEPTIBILITY/ACTIVITY | |||
---|---|---|---|---|---|---|
β-LEAF assay* | Nitrocefin disk test | Zone edge test | Disk diffusion | Antibiotic activity – β-LEAF assay** | ||
‘+’ = positive PCR | Uniform orange color = ‘+’ (positive) | Sharp zone edge = ‘+’ (positive) | S = susceptible | LA = less active | ||
$: contained stop codon or deletion | (!) = sharp zone edge | A = active | ||||
1 | + | + | + | + | S (!) | LA |
2 | - | - | - | - | S | A |
3 | + | - | - | - | S | A |
4 | - | - | - | - | S | A |
5 | + | - | - | - | S | A |
6 | + | + | + | + | S (!) | LA |
7 | + | - | - | - | S | A |
8 | + | - | - | - | S | A |
9 | + | - | - | - | S | A |
10 | +$ | - | - | - | S | A |
11 | + | - | - | - | S | A |
12 | + | - | - | - | S | A |
13 | + | - | - | - | S | A |
14 | + | - | - | - | S | A |
15 | + | - | - | - | S | A |
16 | +$ | - | - | - | S | A |
17 | +$ | - | - | - | S | A |
18 | + | + | + | + | S (!) | LA |
19 | + | + | + | + | S (!) | LA |
20 | + | + | + | + | S (!) | LA |
21 | - | - | - | - | S | A |
22 | + | (Weak) + | - | - | S | A |
23 | - | - | - | - | S | A |
24 | Unknown | - | - | - | S | A |
25 | - | - | - | - | S | A |
26 | + | - | - | - | S | A |
27 | + | - | - | - | S | A |
Col. 1 | Col. 2 | Col. 3 | Col. 4 | Col. 5 | Col. 6 |