Actinomyces israelii Identification Quiz

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Questions and Answers

What is the characteristic feature of the colony formation of Actinomyces israelii on agar?

  • Branching colonies
  • Flat colonies
  • Circular colonies
  • Molar tooth-shaped colonies (correct)

What is the primary mode of transmission for Actinomyces israelii infections?

  • Airborne spread
  • Waterborne transmission
  • Endogenous spread from the patient's own normal flora (correct)
  • Zoonotic transmission

What is the primary clinical presentation of Actinomyces israelii infection?

  • Cervicofacial disease (lumpy jaw) (correct)
  • Pneumonia
  • Sepsis
  • Meningitis

Why is Actinomyces israelii considered an 'obligate anaerobe'?

<p>It can only grow in the absence of oxygen (A)</p> Signup and view all the answers

What is the primary treatment for Actinomyces israelii infections?

<p>Penicillin G or ampicillin antibiotics (C)</p> Signup and view all the answers

What is the primary reservoir for Actinomyces israelii?

<p>Mouth, colon, and vagina (C)</p> Signup and view all the answers

Which of the following clinical diseases is associated with Actinomyces israelii infection?

<p>Cervicofacial disease (B)</p> Signup and view all the answers

What is the characteristic feature of Actinomyces israelii pathogenesis?

<p>Formation of sinus tracts and draining abscesses (D)</p> Signup and view all the answers

Which type of colony does Actinomyces israelii form on agar?

<p>Molar tooth-like with yellow sulfur granules (D)</p> Signup and view all the answers

What is the primary mode of transmission for Actinomyces israelii?

<p>Endogenous spread (A)</p> Signup and view all the answers

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Study Notes

Characteristics of Actinomyces israelii

  • Colony formation on agar is characterized by the presence of "molar tooth" or "splash-like" morphology.
  • Actinomyces israelii is an obligate anaerobe, meaning it requires oxygen-free environment to grow.

Transmission and Reservoir

  • The primary mode of transmission is through endogenous infection, meaning the bacteria is already present in the body.
  • The primary reservoir for Actinomyces israelii is the oral cavity and gastrointestinal tract.

Clinical Presentation and Treatment

  • The primary clinical presentation of Actinomyces israelii infection is pelvic inflammatory disease, thoracic infections, and abdominal infections.
  • The primary treatment for Actinomyces israelii infections is antibiotic therapy, specifically penicillin or tetracycline.

Pathogenesis and Associated Diseases

  • The characteristic feature of Actinomyces israelii pathogenesis is the formation of granulomatous lesions and suppuration.
  • Actinomyces israelii infection is associated with clinical diseases such as actinomycosis, which is a chronic bacterial infection.

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