Proteus mirabilis

Proteus mirabilis is one of the three Proteus bacteria that is humanly pathogenic. Proteus spp are members of the enterobactericiae and a member of the Proteus-Providencia group and are oxidase-negative, catalase-positive, urease-positive (Salmonella are urease-negative) gram-negative rods, may be motile and ‘swarm’ on (blood and chocolate) agar plates:

Swarming of Proteus is inhibited when cultured on CLED agar.

A typical result for Api 20 E shows the biochemical properties for P. mirabilis:

P. mirabilis is a know pathogen of the urogenital tract (review). It’s capability to form biofilms on indwelling catheters complicates the long-term catheterisation of many patients.

Wild type Proteus mirabilis is resistant to nitrofurantoin (NI100) and colistin (CO150) but susceptible to betalactams including ampicillin, gentamicin, tobramycin, trimethoprim-sulfamethoxazole and meropenem:

Another typical Proteus mirabilis antibiogram showing resistance to ampicillin, nitrofurantoin, colisitin and in this case also trimethoprim-sulfamethoxazole:

A Proteus mirabilis antibiogram showing resistance to ampicillin, nitrofurantoin, colisitin and acquired resistance to trimethoprim-sulfamethoxazole and nalidixic acid:

 

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Related posts:

  1. Proteus vulgaris
  2. Proteus penneri
  3. Proteus-Providencia group
  4. Klebsiella pneumoniae
  5. Morganella morganii
  6. Serratia marcescens
  7. Klebsiella oxytoca
  8. Escherichia coli
  9. Pseudomonas aeruginosa
  10. Yersinia

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