To reduce the development of drug-resistant bacteria or fungi and maintain effectiveness, anti-infective drugs should be used only to treat or prevent infections that are proven or strongly suspected to be caused by susceptible bacteria or fungi.
When culture and susceptibility information are available, they should be considered in selecting or modifying antibacterial therapy. In the absence of such data, local epidemiology and susceptibility patterns may contribute to the empiric selection of therapy.
For specific information regarding susceptibility test interpretive criteria and associated test methods and quality control standards recognized by FDA, please see: https://www.fda.gov/STIC.