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<big><center>[[Bacteria|'''BACK TO BACTERIA''']]</center></big>
<big><center>[[Bacteria|'''BACK TO BACTERIA''']]</center></big>
<big><center>[[Infectious agents and parasites|'''BACK TO INFECTIOUS AGENTS AND PARASITES''']]</center></big>
<big><center>[[Infectious agents and parasites|'''BACK TO INFECTIOUS AGENTS AND PARASITES''']]</center></big>
===Overview===
*Inhabitants of the gastrointestinal tract
*Not pathogenic in the gut
*Opportunistic infections
===Characteristics===
*Non-lactose fermentors
*Urease positive (differentiate from ''Salmonella''