VETS3010-2 Gram-positive Rods: Enterobacteriaceae

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

Mucosal adherence properties

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

Respiratory tract infections

What is the typical morphology of the family Enterobacteriaceae?

Gram-negative straight rods

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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