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Under the microscopeone one sees innumerable long, threadlike chains, consisting of bacilli, "Medusa Head"

painted by Garavaggio

Medusa was beheaded by the hero Perseus, who thereafter used her head as a weapon untill he gaved it to the godess Athena to place on her shield

Bacillus cereus

  • General information

    • the following information is not yet verified
      Bacillus cereus group: B.anthracis, B.cereus, B.mycoides, B.thuringiensis

      Taxonomy
      Family: Bacillaceae

      Natural habitats
      Spores are widespread in the environment, e.g. soil, water, air or foods

      Clinical significance
      B. cereus is pathogenic of human and mammals, causing foodborne illness and opportunistic infections (e.g. endophtalmie, keratitis, septicemia, meningitis, endocarditis, pneumonia, osteomyelitis, urinary infections, cutaneous infections).

      It is a destructive ocular pathogen.

  • Gram stain

    • the following information is not yet verified
      Gram positive rods, with square ends,

      1.0-1.3 x 3.0-5.0 µm
      (only B.cereus group + B.megaterium >1 µm)

      The bacilli tend to occur in chains
      (appearance of bamboo)

      Spore shape: ellipsoidal, (cylindrical)
      Spore position: subterminal (central of paracentral)
      Sporangia swelling: negative

  • Culture characteristics

    • the following information is not yet verified

      Facultative anaerobic

      Colonies are large, 6-7 mm, matte, opaque, whitish to cream with a "winding" edge, HEMOLYTIC.

      Under the microscope one sees innumerable long, threadlike chains, consisting of bacilli, "Medusa Head".

      Smooth and moist colonies are possible.

      No capsule present

      BBAØ growth

  • Characteristics

  • References

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


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