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11. Antibiotic Selection

Empiric therapy is any treatment that is started prior to diagnosis of the disease-causing organism. Antimicrobial agents used in empiric therapy are commonly broad-spectrum so that they will be effective against a wide variety of possible organisms. Once culture results are available, the antibiotic treatments may need to be changed to specifically target the cultured organism.


Empirical treatments are experience-based, therapeutic regimens generally administered prior to confirmatory diagnosis.  Veterinarians rely on empirical antibiotic treatments when therapy is urgent and cannot wait for laboratory testing, but empirical treatments may fail when the pathogen has gained resistance.




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