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  1. Development Resources

Cefazolin – Injection products

FDA Identified Breakpoints


Minimum Inhibitory

Disk Diffusion
(zone diameter in mm)

Pathogen S I R S I R

M-100 standard is recognized

S = Susceptible; I = Intermediate; R = Resistant
Interpretive criteria are based on a dose of 2 g every 8 hr.

Separate susceptibility test interpretive criteria for Enterobacterales for therapy of uncomplicated urinary tract infections are not recognized at this time.


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