Certified Hyperbaric Technologist Practice Test

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Equip yourself for the Certified Hyperbaric Technologist Test. Learn with flashcards and multiple-choice questions, each featuring hints and explanations. Ensure you're ready for your exam!

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What is the causative organism in actinomycosis?

Actinomyces israelii
Clostridium perfringens
Streptococcus pneumoniae
Bacteroides fragilis

The correct answer is: Actinomyces israelii

The causative organism in actinomycosis is Actinomyces israelii. This bacterium is a slow-growing, anaerobic organism that is part of the normal flora of the human mouth and gastrointestinal tract. Actinomycosis is primarily characterized by chronic granulomatous infections that can manifest as abscesses, typically in the jaw, thorax, or abdomen. Actinomyces israelii tends to infect tissues that are already compromised, often following trauma or surgical procedures. It often forms characteristic "sulfur granules," which are aggregates of bacterial filaments visible in pus or tissue. The specific association of Actinomyces israelii with actinomycosis is critical for diagnosis and treatment because the organism is relatively resistant to many antibiotics, requiring specific therapeutic strategies. The other organisms listed are associated with different infections and conditions, which underscores the importance of identifying the correct causative agent for effective treatment.