20 Questions
Which structure of Enterobacteriaceae is classified by more than 150 different heat-stable somatic O antigens?
Lipopolysaccharide O antigens
Which characteristic is shared by most gram-negative enteric bacteria?
Presence of peritrichous flagella
What is a key factor for the identification of enteric bacteria?
Lactose fermentation
Which member of the normal intestinal microbiota is considerably less common than E. coli?
Proteus
In which anatomical site can clinically important infections caused by enteric bacteria occur?
Urinary tract
Which of the following is NOT a member of the Enterobacteriaceae family?
Streptococcus
What is the natural habitat of Enterobacteriaceae?
Intestinal tract of humans and animals
Which Enterobacteriaceae organism is part of the normal microbiota and incidentally causes disease?
Escherichia coli
What type of organisms are the Enterobacteriaceae in terms of oxygen requirement?
Facultative anaerobes or aerobes
Which characteristic is NOT possessed by Enterobacteriaceae?
Lack complex antigenic structure
What is the natural habitat of the Enterobacteriaceae?
intestinal tract of humans and animals
Name three genera included in the family Enterobacteriaceae.
Escherichia, Salmonella, Klebsiella
What type of microorganisms are the Enterobacteriaceae in terms of oxygen requirement?
facultative anaerobes or aerobes
What is a key characteristic of the Enterobacteriaceae's antigenic structure?
complex
Which enteric organisms are part of the normal microbiota and incidentally cause disease?
Escherichia coli
What are the three types of antigens used for classification of Enterobacteriaceae?
O antigens, K antigens, H antigens
What are the shared characteristics of Enterobacteriaceae?
True & opportunistic pathogens, Gram negative rods, Oxidase negative, Facultative organisms, Ferment glucose, Reduce nitrate to nitrite
What is the main anatomical site of clinically important infections caused by enteric bacteria?
Urinary tract, biliary tract, and other sites in the abdominal cavity
Which enteric bacteria are considerably less common than E. coli in the normal intestinal microbiota?
Proteus, Enterobacter, Klebsiella, Morganella, Providencia, Citrobacter, and Serratia species
When do the enteric bacteria become pathogenic?
When they reach tissues outside of their normal intestinal or other less common normal microbiota sites
Test your knowledge on Enterobacteriaceae in Microbiology Week 6 with Dr. Beriwan A. Ali. This quiz covers the characteristics, classification, and medical significance of the Enterobacteriaceae family.
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