Journal
JOURNAL OF CHEMOTHERAPY
Volume 34, Issue 5, Pages 302-310Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/1120009X.2022.2031471
Keywords
Gram-negative; blood culture; ceftolozane-tazobactam; ceftazidime-avibactam; meropenem-vaborbactam; cefiderocol
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This study found that the majority of Gram-negative bacteria showed high susceptibility to ceftazidime-avibactam (CZA), amikacin, and meropenem. ESBL-producing Enterobacterales also exhibited high susceptibility to CZA, carbapenems, and ceftolozane-tazobactam. Meropenem-vaborbactam displayed the highest activity against KPC-producing Enterobacterales.
Herein we assessed the frequency of Gram-negative organisms causing bloodstream infections and activity spectrum of ceftolozane-tazobactam (CTZ), ceftazidime-avibactam (CZA), meropenem-vaborbactam (MEV), cefiderocol (CFDC) and comparators. Overall, 1605 Gram-negative isolates were consecutively collected during 2019-2021. Enterobacterales represented more than 75% and exhibited >90% susceptibility to CZA (97%), amikacin (91.8%) and meropenem (90.6%). ESBL-producing Enterobacterales isolates showed high rates of susceptibility towards CZA (100%), carbapenems (89.1-100%) and CTZ (84.9-95.1%). MEV displayed the highest activity against KPC-producing Enterobacterales (MIC50/90, 0.75/4 mg/L; 92.9% susceptible) followed by CZA (MIC50/90, <= 2/>8 mg/L; 89.3% susceptible), CFDC (MIC50/90, 0.25/4 mg/L, 87.5% susceptible) and colistin (MIC50/90, <= 2/4 mg/L, 83.9% susceptible). High proportions of P. aeruginosa isolates were susceptible to colistin (97.8%), CZA (97.2%), CTZ (96.1%) and amikacin (94.5%). CFDC showed potent activity against Acinetobacter baumannii (MIC50/90, 0.5/1 mg/L; 97.2% susceptible), multi-drug resistant P. aeruginosa (MIC50/90, 0.25/1 mg/L; 96% susceptible), and Stenotrophomonas maltophilia (MIC50/90, 0.12/0.25 mg/L; 100% susceptible).
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