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Intrinsically resistant to cefazolin, ampicillin, Augmentin, nitrofurantoin
Severe infection:
Mild-moderate infection:
Cystitis: fosfomycin not routinely recommended due to presence of FosA gene which hydrolyzes Fos and may lead to clinical failures.
Gram-negative bacilli of the Enterobacteriaceae family
GI flora, especially in hospitalized patients.
Infection usually in nosocomial setting.
Nosocomial infections:
May require contact precautions if highly resistant.