10 Questions
What is the characteristic feature of the colony formation of Actinomyces israelii on agar?
Molar tooth-shaped colonies
What is the primary mode of transmission for Actinomyces israelii infections?
Endogenous spread from the patient's own normal flora
What is the primary clinical presentation of Actinomyces israelii infection?
Cervicofacial disease (lumpy jaw)
Why is Actinomyces israelii considered an 'obligate anaerobe'?
It can only grow in the absence of oxygen
What is the primary treatment for Actinomyces israelii infections?
Penicillin G or ampicillin antibiotics
What is the primary reservoir for Actinomyces israelii?
Mouth, colon, and vagina
Which of the following clinical diseases is associated with Actinomyces israelii infection?
Cervicofacial disease
What is the characteristic feature of Actinomyces israelii pathogenesis?
Formation of sinus tracts and draining abscesses
Which type of colony does Actinomyces israelii form on agar?
Molar tooth-like with yellow sulfur granules
What is the primary mode of transmission for Actinomyces israelii?
Endogenous spread
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.
Test your knowledge on Actinomyces israelii by identifying key characteristics such as purple hue, tree in the background, gas mask, yellow sulfur granules, and molar tooth colony on agar. Learn about its transmission, reservoirs, and disease associations.
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