Table 2 Antibiotic susceptibility test results of reference bacterial strains on MH agar versus NA during 30 days of QC testing, Alexandria, 2015–2016
From: Evaluation of antibiotic susceptibility test results: how guilty a laboratory could be?
Reference strains | Antibiotic tested | Out of range results/30 QC days* (compared to CLSI ranges) | |||
|---|---|---|---|---|---|
MH | NA | ||||
Larger IZs | Smaller IZs | Larger IZs | Smaller IZs | ||
P. aeruginosa ATCC® 27853 | Ceftazidim (CAZ) | 0/30 | 0/30 | 13/30 | 2/30 |
Gentamicin (CN) | 0/30 | 0/30 | 4/30 | 13/30 | |
Tobramycin (TOB) | 0/30 | 0/30 | 0/30 | 15/30 | |
Piperacillin (PRL) | 1/30 | 2/30 | 6/30 | 9/30 | |
Ciprofloxacin (CIP) | 2/30 | 0/30 | 19/30 | 2/30 | |
E. coli ATCC®25922 | Ampicillin (AMP) | 0/30 | 3/30 | 0/30 | 13/30 |
Cefazolin (KZ) | 0/30 | 1/30 | 0/30 | 13/30 | |
Gentamicin (CN) | 0/30 | 2/30 | 0/30 | 6/30 | |
Tobramycin (TOB) | 0/30 | 1/30 | 0/30 | 9/30 | |
Tazobactam-piperacillin (TZP) | 0/30 | 0/30 | 2/30 | 6/30 | |
S. aureus ATCC®25923 | Azithromycin (AZM) | 0/30 | 2/30 | 0/30 | 23/30 |
Clindamycin (DA) | 0/30 | 2/30 | 0/30 | 9/30 | |
Cefoxitine (FOX) | 0/30 | 2/30 | 6/30 | 1/30 | |
Penicillin (P) | 1/30 | 2/30 | 16/30 | 2/30 | |
Sulfamethoxazol-trimethoprim (SXT) | 0/30 | 0/30 | 4/30 | 13/30 | |