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Enterobacterales

Providencia spp.

Gram-negative bacilli

Identification & Growth

Identification

  • Oxidase-negative, indole-positive, citrate-positive, ornithine-negative
  • P. stuartii: variable urease activity

Growth Conditions

  • MacConkey agar, lactose-negative; 35 °C, 24 h

Clinical Significance

  • UTI associated with prolonged catheterization and long-term care patients

Intrinsic Resistance

  • Colistin/polymyxin B, nitrofurantoin, tetracyclines (EUCAST Expected Resistant Phenotypes v1.2)
  • Ampicillin and first-generation cephalosporins

Bench Alerts

  • Imipenem breakpoints do not apply
  • Multidrug resistance is frequent

Clinical Notes

Clinical presentations

  • Causes urinary tract infections, especially in patients with long-term urinary catheterization or spinal cord injury.
  • Providencia stuartii is the species most associated with bacteremia and complicated urinary infection in long-term care settings.

Specimens and collection

  • Catheter urine culture should be collected by puncturing the sampling port, never from the collection bag, to avoid biofilm contamination.
  • Blood cultures should be obtained in long-term care patients with signs of sepsis of probable urinary origin.

Epidemiology and at-risk populations

  • Predominantly associated with long-term care facility residents and chronic urinary catheter carriers.
  • Patients with spinal cord injury and neurogenic bladder show increased risk of colonization and recurrent infection.

Resistance and therapeutic implications

  • Carries an inducible chromosomal AmpC beta-lactamase, conferring expected resistance to ampicillin, amoxicillin-clavulanate, and first-generation cephalosporins.
  • It is intrinsically resistant to nitrofurantoin, tigecycline, and colistin/polymyxins, similar to other Proteeae.
  • Providencia stuartii is historically associated with acquired multidrug resistance in long-term care settings, requiring individualized susceptibility testing.

Bench and reporting notes

  • Gram-negative rod, variable urease activity (weaker than Proteus/Morganella), without swarming motility, guiding phenotypic differentiation among Proteeae.
  • The report should state intrinsic resistance to nitrofurantoin, tigecycline, and colistin, avoiding inappropriate use of these classes.
  • Species-level identification is recommended for recurrent isolates from long-term care facilities for epidemiologic surveillance purposes.

Sources

Educational decision-support content. It does not replace laboratory validation, current guidelines or review by the responsible professional.

FAQ: Frequently Asked Questions

How to identify Providencia spp. in the lab?

Providencia spp. is identified through oxidase-negative, indole-positive, citrate-positive, ornithine-negative, p. stuartii: variable urease activity.

What are the intrinsic resistances of Providencia spp.?

This organism is naturally resistant to colistin/polymyxin b, nitrofurantoin, tetracyclines (eucast expected resistant phenotypes v1.2), ampicillin and first-generation cephalosporins. These drugs should not be reported as susceptible.

Where is Providencia spp. commonly found?

It is typically associated with uti associated with prolonged catheterization and long-term care patients.

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