Sir Alexander Fleming
"one sometimes finds what one is not looking for"

Micrococcus luteus

  • General information

    • the following information is not yet verified
      Micrococcus was discovered by Sir Alexander Fleming before he discovered penicillin 1928

      Family: Micrococcaceae

      Natural habitats
      Micrococci are widespread in nature and are commonly found on the skin of humans and other mammals.

      They are generally believed to be temporary residents and are most frequently found on the exposed skin of the face, arms, hands, and legs.

      Clinical significance
      They thought of as harmless or commensal organism, though it can be an opportunistic pathogen, there have been rare cases of infections in people with compromised immune systems, as occurs with HIV patients.

  • Gram stain

    • the following information is not yet verified
      Gram positive cocci,

      0.5-1.8 µm,

      occurring mostly tetrads, and irregular clusters.

      Mature cells lose the ability to retain the crystal violet, which makes them decolorization easier than younger cells.

  • Culture characteristics

    • the following information is not yet verified

      Obligate aerobic

      BA: after 48 hours the colonies are 1-2 mm in diameter (grow more slowly than staphylococci).

      Colonies dull or matte, convex and bright yellow, and a small percentage are crème-white.

      McConkey: growth

      BBAØ: no growth

  • Characteristics

  • References

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