Table 2.
Antibiotic | Supplier | Disk content (μg) | Zone diameter (mm) breakpointsd | ||
---|---|---|---|---|---|
S | I | R | |||
Ampicillina | BD | 10 | ≥17 | – | ≤16 |
Doxycyclinea | BD | 30 | ≥16 | 13–15 | ≤12 |
Erythromycina | BD | 15 | ≥23 | 14–22 | ≤13 |
Gentamicina | BD | 120 | ≥10 | 7–9 | 6 |
Levofloxacina | BD | 5 | ≥17 | 14–16 | ≤13 |
Linezolida | BD | 30 | ≥23 | 21–22 | ≤20 |
Nitrofurantoina | BD | 300 | ≥17 | 15–16 | ≤14 |
Quinupristin-dalfopristina | BD | 4.5/10.5 | ≥19 | 16–18 | ≤15 |
Streptomycina | BD | 300 | ≥10 | 7–9 | 6 |
Tigecycline | BD | 15 | ≥18 | – | <15 |
Tylosinb | Medox | 30 | n/a | n/a | n/a |
Vancomycina, c | BD | 30 | ≥17 | 15–16 | ≤14 |
M100-S24: Performance standards for antimicrobial susceptibility testing; twenty-fourth informational supplement (Clinical and Laboratory Standards Institute, 2014b).
Breakpoint tables for interpretation of MICs and zone diameters. Version 4.0. (The European Committee on Antimicrobial Susceptibility Testing, (EUCAST), 2014).
Vancomycin requires 24 h incubation while for all other antibiotics 16–18 h incubation is sufficient.
Zone diameter value used to indicate susceptible (S), intermediate (I), resistant (R) and not available (n/a).