Medical Microbiology Lecture: Bacillus spp. Characteristics

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Questions and Answers

Which of the following best describes the primary habitat of Bacillus spp.?

  • Soil (correct)
  • Human body
  • Air
  • Water

What is the major factor responsible for the virulence of Bacillus anthracis?

  • Capsule (correct)
  • Flagella
  • Fimbriae
  • Pili

In which type of animals is Bacillus anthracis primarily a disease?

  • Aquatic animals
  • Herbivorous animals (correct)
  • Carnivorous animals
  • Omnivorous animals

What is the characteristic shape of Bacillus anthracis bacteria?

<p>Rod-shaped (D)</p> Signup and view all the answers

Under which conditions do central, non-swelled spores of B. anthracis develop?

<p>In culture outside the human body (A)</p> Signup and view all the answers

Which protein component of B. anthracis forms edema toxin when combined with protective antigen?

<p>Edema factor (EF) (C)</p> Signup and view all the answers

What is the causative agent of pulmonary anthrax?

<p>Bacillus anthracis (A)</p> Signup and view all the answers

What is the incubation period for pulmonary anthrax?

<p>Up to 6 weeks (B)</p> Signup and view all the answers

Which species causes food poisoning with enterotoxins that have emetic or diarrheal effects?

<p>Bacillus cereus (B)</p> Signup and view all the answers

What is the characteristic appearance of B. anthracis colonies on blood agar?

<p>Large, grayish, and non-hemolytic with an irregular border (D)</p> Signup and view all the answers

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