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Fermenting gram negative rod, of the Enterobacteriaceae family
Normal GI flora - most predominant gram negative bacillus
Most common cause of UTI
Also common:
Gastroenteritis, ranging from traveler's diarrhea to invasive infection with hemolytic-uremic syndrome
May require contact precautions if highly resistant i.e. ESBL, carbapenem resistant
Treatment of choice for ESBL strains is a carbapenem