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Pasteurella is named after Louis Pasteur (1822-1895), chemist and bacteriologist in Paris

Pasteurella multocida

  • General information

    • the following information is not yet verified
      Taxonomy
      Family: Pasteurellaceae
      3 subspecies
      - P. multocida subsp. multocida
      - P. multocida subsp. septica
      - P. multocida subsp. gallicida

      History
      Is named after Louis Pasteur (1822-1895), chemist and bacteriologist in Paris

      Natural habitats
      They are part of the normal flora of the respiratory tract of animals.
      Through contact with these animals (licking, biting and scratching), humans can be infected, often by cats and dogs.

      Clinical significance
      Through contact with animals or bites especially cats or dogs the bacterium is transmitted to humans.
      Arise within 48 hours painful infections erythema and swelling, the presence of pus is rare.
      Infection can also occur through inhalation of the micro-organism.

      Respiratory infections and urogenital infections also occur.
      Complications can arise due to sepsis, meningitis, septic arthritis, peritonitis, and osteomyelitis.

      Virulence
      Due to the polysaccharide capsule is the Pasteurella resistant to phagocytosis.
      Although some strains produce a cytotoxin its role in the pathogenesis of the disease is not clear.
      Of all the P. species is P. multocida the most virulent.

      There are five serogroups (A, B, D, E and F) based on the capsular antigen

  • Gram stain

    • the following information is not yet verified
      Short, small, oval-shaped Gram-negative rods,

      0.5-1.5 µm,

      often with bipolar staining, similar to safety pins.

      Lying alone, in pairs or short chains.

      Encapsulation occurs often

  • Culture characteristics

    • the following information is not yet verified

      Facultative anaerobic
      5% CO2 improves the growth

      Colonies are 1-2mm after 24 hours, and are opaque, smooth and grayish.

      They can have a slight greening underneath the colonies.

      Encapsulated strains tend to be mucoid.

      Sometimes the colonies are rough or mucoid.

      For humans virulent strains are often mucoid.

      McConkey no growth

      BBAØ growth

      Smell a mouse-like odor (probably due to the formation of indol)

  • Characteristics

  • References

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


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