Trends of β-Lactamase Occurrence among Escherichia coli and Klebsiella pneumoniae in United States Hospitals during a 5-year period and Activity of Antimicrobial Agents against Isolates Stratified by β-Lactamase Type
Trends of β-Lactamase Occurrence among Escherichia coli and Klebsiella pneumoniae in United States Hospitals during a 5-year period and Activity of Antimicrobial Agents against Isolates Stratified by β-Lactamase Type
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