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Activities of ceftazidime, ceftaroline, and aztreonam alone and combined with avibactam against isogenic Escherichia coli strains expressing selected single β-lactamases.

Abstract：

:Avibactam is a novel β-lactamase inhibitor that restores the activity of otherwise hydrolyzed β-lactams against Gram-negative bacteria expressing different classes of serine β-lactamases. In the last decade, β-lactam-avibactam combinations were tested against a variety of clinical isolates expressing multiple commonly encountered β-lactamases. Here, we analyzed isogenic Escherichia coli strains expressing selected single β-lactamase genes that were not previously tested or were not characterized in an isogenic background. The activities of ceftazidime, ceftaroline, and aztreonam alone and in combination with 4 mg/L of avibactam, as well as comparator agents, were assessed against a unique collection of isogenic strains of E. coli carrying selected extended-spectrum, inhibitor-resistant, and/or carbapenem-hydrolyzing bla genes. When combined with avibactam, ceftazidime, ceftaroline, or aztreonam MICs were reduced for 91.4%, 80.0%, and 80.0% of isolates, respectively. The data presented add to our understanding of the microbiologic spectrum of these β-lactams with avibactam and serve as a reference for further studies.

journal_name

Diagn Microbiol Infect Dis

journal_title

Diagnostic microbiology and infectious disease

authors

Papp-Wallace KM,Bajaksouzian S,Abdelhamed AM,Foster AN,Winkler ML,Gatta JA,Nichols WW,Testa R,Bonomo RA,Jacobs MR

doi

10.1016/j.diagmicrobio.2015.02.003

subject

Has Abstract

pub_date

2015-05-01 00:00:00

pages

65-9

issue

1

eissn

0732-8893

issn

1879-0070

pii

S0732-8893(15)00037-1

journal_volume

82

pub_type

杂志文章

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