Research Article

Activity of Ceftaroline against Aerobic Gram-Positive and Gram-Negative Pathogens: Effect of Test Method Variability

Table 2

Ceftaroline MICs (μg/mL) in the cation-adjusted Mueller-Hinton broth with test variables and agar dilution MICs.

Ceftaroline MICs (μg/mL) in the cation-adjusted Mueller Hinton broth with test variablesAgar dilution
Ca++% NaClpHInoculum cfu/mL% serumIncubationMHAMHA/
LHB
HTMA
OrganismRMA numberREF50 mg/L5681041061050LHBHTMCO2Anaerobic

ATCC
E. coli 259220.060.06≤0.0080.1250.060.060.1250.060.1250.1250.1250.1250.030.060.250.25
190890.060.1250.0150.060.060.030.1250.060.060.1250.060.1250.1250.1250.250.25
190900.030.125≤0.0080.060.030.0320.060.030.1250.1250.1250.1250.030.250.25

K. pneumoniae190910.250.250.0150.50.250.25>80.250.1250.250.50.50.250.1250.250.5
190920.030.1250.0150.060.060.030.1250.060.060.1250.060.1250.060.060.1250.25
190930.060.1250.0150.060.060.030.250.030.060.1250.060.1250.060.060.1250.25

ATCC
H. influenzae492470.0150.015ngng0.06ng0.060.060.060.06n/t0.060.03ng0.060.125
16081≤0.008≤0.008ngng≤0.008ng≤0.008≤0.008≤0.008≤0.008n/t≤0.008≤0.008ng0.060.015
185200.0150.015ngng0.030.0150.060.060.030.03n/t0.0150.03ng0.0150.06

M. catarrhalis119400.1250.06ngng0.1250.0320.060.1250.1250.1250.06ng0.060.03n.g.
140320.060.06ngng0.250.0310.1250.250.1250.1250.25ng0.060.030.03
188610.030.03ng0.030.060.01520.250.250.1250.060.25ng0.030.0150.06

ATCC
S. aureus
-MSSA
292130.1250.1250.1250.250.250.1250.250.1250.1250.250.250.1250.1250.250.250.5
184880.1250.1250.250.250.250.1250.250.1250.1250.250.250.1250.1250.250.250.5
184010.1250.1250.1250.250.1250.1250.250.1250.1250.250.250.250.1250.250.250.5

S.aureus
-MRSA
184830.250.50.250.50.50.250.50.250.50.50.50.250.250.50.51
185040.250.50.250.250.50.250.50.250.50.50.250.250.250.50.51
185260.250.50.250.250.250.250.50.250.50.50.50.250.250.50.51

ATCC
E. faecalis292120.50.510.510.51110.510.50.510.52
182841122212122211224
18877110.060.521222120.50.520.54

S. pyogenes170180.0020.002ng0.0020.0020.0020.0040.0020.002n/t0.0040.0040.004≤0.008≤0.0080.015
170190.0040.004ng0.0040.0040.0040.0040.0020.002n/t0.0040.0040.004≤0.008≤0.0080.015
190470.0040.004ng0.0040.0040.0040.0040.0040.004n/t0.0080.0040.004≤0.008≤0.0080.015

ATCC
S. pneumoniae496190.0150.015ng0.0150.0080.0080.0150.0150.008n/t0.0150.0150.015≤0.0080.015≤0.008
190940.0040.004ng0.0040.0040.0040.0040.0040.004n/t0.0080.0040.004≤0.008≤0.008≤0.008
190950.0040.004ng0.0040.0040.0040.0040.0040.004n/t0.0040.0040.004≤0.008≤0.008≤0.008
133450.1250.125ng0.1250.060.060.1250.1250.06n/t0.060.060.1250.060.1250.125
133850.1250.125ng0.1250.060.1250.1250.1250.125n/t0.1250.1250.1250.060.1250.125
188760.250.25ng0.1250.250.250.250.250.25n/t0.250.250.1250.1250.250.25

ATCC: American Type Culture Collection; CFUs: colony-forming units; HTM: Haemophilus test medium; HTMA: HTM with 1.5% agar; LHB: laked horse blood; MHA: Mueller Hinton agar; MIC: minimum inhibitory concentration; MRSA: methicillin-resistant Staphylococcus aureus; MSSA: methicillin-susceptible Staphylococcus aureus; ng: no growth; nt: not tested; REF: reference method; RMA: R.M. Alden (culture collection).
All H. influenzae were tested in HTM; all streptococci were tested with 2.5% LHB supplementation.