Diabetic ulceration with central "dry" gangrene and toward the edges, gangrene with some ascending cellulitis.

Ulcers start when the top layer (surface) of skin or mucous membrane is hurt. This top layer dies. When it dies, the skin or mucous membrane and opens. This leaves an open sore called an ulcer.

Author Dr Gnuwikimedia commons

diabetic foot ulcer

photo: Phalinn Ooi
wikimedia commons

Alcaligenes faecalis

  • General information

    • the following information is not yet verified
      Family: Alcaligenaceae,
      also former Alcaligenes odorans

      Natural habitats
      It is commonly found in the enviroment, soil and water.

      They are also present in a hospital environment, where it is wet, such as; respirators and dialysis systems and can sometimes colonize the skin.

      Clinical significance
      Alcaligenes faecalis is usually a non-pathogenic bacteria that harbors in the human intestinal tract.

      They are commonly found in mixed cultures, especially in diabetic ulcers of the legs and feet .

      Transmission of A.faecalis probably due to exposure to contaminated instruments or solutions.

  • Gram stain

    • the following information is not yet verified
      Gram negative rods,

      0.5-1 x 0.5-2.6 µm

  • Culture characteristics

    • the following information is not yet verified

      Obligate aerobic

      Colonies are whitish with a feathery, thin flared irregular edges.
      colonies appear non-pigmented and similar in size to Acinetobacter.

      Some strains (previously named “A. odorans”) produce a characteristic fruity odor and cause a greenish discoloration of blood agar medium (α-hemolytic)

      McConkey growth, non lactose fermenter

      BBAØ no growth

  • Characteristics

  • References

    • James Versalovic et al.(2011) Manual of Clinical Microbiology 10th Edition

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