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17 Cards in this Set
- Front
- Back
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What are Actinomycetes?
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G+ bacteria with branching filaments resemling fungal hyphae.
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What are two medically important Actinomycetes?
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A. israelii (anaerobic)
Nocardia asteroides (aerobic) |
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Is person-to-person transmission of Actinomyces or Nocardia possible?
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NO
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Where do A. israelii reside?
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Normal flora of oral cavity
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What are the oxygen requirements of A. israelii?
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Obligate anaerobic
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How does A. israelii appear microscopically?
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Sulfur granules surrounded by neutrophils.
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Do sulfur granules contain sulfur?
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NO, their yellowish appearance only resembles sulfur.
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How can one be infected with A. israelii?
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Trauma to the face of mouth
Human bite Poor dental hygiene |
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What are three clinical manifestations of A. israelii?
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Pus containing sulfur granules
Nontender abscesses, typically in the head and cervical region Drainage through sinus tracts |
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How is Actinomyces treated?
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Penicillin
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Where is Nocardia found?
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Soil
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How is Nocardia usually contracted?
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Inhalation of aerosolized particles
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What are the oxygen requirements of Nocardia?
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Obligate aerobic
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What property does Nocardia share with Mycobacterium tuberculosis?
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Both are acid-fast
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Which one stains more weakly: M. tuberculosis or Nocardia?
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Nocardia stains more weakly with acid-fast reagents than M. tuberculosis.
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What are two clinical manifestatins of Nocardia?
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Pneumonia
Abscess formation in various organs following pneumonia. |
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How is Nocardia infection treated?
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Trimethoprim-sulfamethoxazole.
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