VETS3010-2 Gram-positive Rods: Enterobacteriaceae
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Questions and Answers

Which of the following is a common virulence factor of the family Enterobacteriaceae?

  • Fimbrial proteins
  • Mucosal adherence properties (correct)
  • Glucose fermentation
  • Flagellin subunits

    • Which of the following diseases can be caused by some members of the family Enterobacteriaceae?

  • Skin infections
  • Respiratory tract infections (correct)
  • Eye infections
  • Bone infections

    • What is the typical morphology of the family Enterobacteriaceae?

  • Non-motile bacteria
  • Gram-negative straight rods (correct)
  • Gram-positive cocci
  • Spiral-shaped bacteria

    • What is the catalase reaction of the family Enterobacteriaceae?

    <p>+ve</p> Signup and view all the answers

    What type of fimbriae do most members of Enterobacteriaceae have?

    <p>Type I fimbriae</p> Signup and view all the answers

    What is the function of fimbriae in bacteria?

    <p>Conferring specific binding to host cells</p> Signup and view all the answers

    Which virulence factor can elicit severe toxic reactions in animals due to its effects on the innate immune and coagulatory systems?

    <p>Endotoxin (lipid A of the LPS)</p> Signup and view all the answers

    What is the primary function of Afimbrial adhesins (AFA) in bacteria?

    <p>Nonfimbrial proteins on the OM, found on the surfaces of certain uropathogenic E. coli strains</p> Signup and view all the answers

    Which biochemical test is used to differentiate Citrobacter from other Gram-negative enterobacteria on MacConkey agar?

    <p>Lactose negative slow fermenter</p> Signup and view all the answers

    What distinguishes the fast fermenter Klebsiella and E. coli on MacConkey agar?

    <p>Urease positive</p> Signup and view all the answers

    Which of the following is NOT a characteristic of the family Enterobacteriaceae?

    <p>Glucose non-fermenters</p> Signup and view all the answers

    What is the primary function of the O antigen in the family Enterobacteriaceae?

    <p>An LPS component</p> Signup and view all the answers

    Which of the following is a common symptom associated with extraintestinal infections caused by some members of the family Enterobacteriaceae?

    <p>Meningitis</p> Signup and view all the answers

    What type of fimbriae do most members of Enterobacteriaceae have?

    <p>Type I fimbriae</p> Signup and view all the answers

    Which virulence factor in the family Enterobacteriaceae provides antiphagocytic and serum resistance properties?

    <p>K antigen</p> Signup and view all the answers

    Which biochemical test is used to differentiate Escherichia coli from other Gram-negative enterobacteria on MacConkey agar?

    <p>Lactose fermentation test</p> Signup and view all the answers

    What is the function of flagella and pili in bacteria?

    <p>Help bacteria to attach and colonize the host epithelium</p> Signup and view all the answers

    What is the primary function of Afimbrial adhesins (AFA) in bacteria?

    <p>Confer specific binding to the host cells</p> Signup and view all the answers

    Which of the following virulence factors elicits severe toxic reactions in animals due to its effects on the innate immune and coagulatory systems?

    <p>Endotoxin (lipid A of the LPS)</p> Signup and view all the answers

    What can be performed for differentiation within the family Enterobacteriaceae?

    <p>Immunological tests: serotyping of O : K : H : F antigens</p> Signup and view all the answers

    Which biochemical test is used to differentiate fast fermenter Klebsiella and E. coli from other Gram-negative enterobacteria on MacConkey agar?

    <p>Urease test</p> Signup and view all the answers

    What distinguishes Salmonella spp. from other Gram-negative enterobacteria on MacConkey agar?

    <ul> <li>Producing H2S</li> </ul> Signup and view all the answers

    What is the typical morphology of Y. pestis on MacConkey agar?

    <p>Bipolar staining</p> Signup and view all the answers

    What is the primary function of fimbriae in bacteria?

    <p>Confers specific binding to the host cells</p> Signup and view all the answers

    What is the catalase reaction of the family Enterobacteriaceae?

    <p>Positive</p> Signup and view all the answers

    What diseases can be caused by some members of the family Enterobacteriaceae?

    <p>Dysentery and Typhoid fever</p> Signup and view all the answers

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