In Vitro Activity of Ceftolozane-Tazobactam and Other Antimicrobial Agents against Burkholderia cepacia Complex and Burkholderia gladioli.

We tested the activities of ceftolozane-tazobactam and 13 other antimicrobial agents against 221 strains of Burkholderia cepacia complex and Burkholderia gladioli Most strains (82%) were cultured from persons with cystic fibrosis, and most (85%) were recovered since 2011. The ceftolozane-tazobactam MIC was ≤8 µg/ml for 77% of the strains. However, the MIC range was broad (≤0.5 to >64 µg/ml; MIC50/90, 2/32 µg/ml). Significant differences in susceptibility to some antimicrobial agents were observed between species.