This might be because I only used imi/rele when ceftol/tazo was unable, but I think of this agent more for pseudomonas than KPC isolates. I would also use the ceftaz/avi personally. Though technically I think mero/vabo may be considered more narrow spectrum
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2. Add the spectrum is being provided by the Ceftazidime or Imipenem, I would say yes, it is narrower spectrum.