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Questions and Answers
What are the three types of antigens used to classify Enterobacteriaceae?
What are the three types of antigens used to classify Enterobacteriaceae?
O (lipopolysaccharide) antigens, K (capsular) antigens, and H (flagellar) antigens
What are the shared characteristics of Enterobacteriaceae?
What are the shared characteristics of Enterobacteriaceae?
True & opportunistic pathogens, Gram-negative rods, Peritrichous flagella, Oxidase negative, Facultative organisms, Ferment glucose, and Reduce nitrate to nitrite
What are the key methods for species identification of Enterobacteriaceae?
What are the key methods for species identification of Enterobacteriaceae?
Lactose fermentation, motility, IMViC tests (Indole, Methyl red, Voges-Proskauer, and Citrate utilization), H2S production, urease production, oxidase test, and API (Analytical Profile Index)
Which enteric bacteria are members of the normal intestinal microbiota but are considerably less common than E coli?
Which enteric bacteria are members of the normal intestinal microbiota but are considerably less common than E coli?
In which circumstances do the enteric bacteria become pathogenic?
In which circumstances do the enteric bacteria become pathogenic?
What is the natural habitat of Enterobacteriaceae?
What is the natural habitat of Enterobacteriaceae?
Name two genera included in the family Enterobacteriaceae.
Name two genera included in the family Enterobacteriaceae.
What are the shared characteristics of Enterobacteriaceae?
What are the shared characteristics of Enterobacteriaceae?
Which enteric organism is part of the normal microbiota and incidentally causes disease?
Which enteric organism is part of the normal microbiota and incidentally causes disease?
Name two enteric gram-negative rods that may also be called coliforms.
Name two enteric gram-negative rods that may also be called coliforms.
Enterobacteriaceae are classified by more than 150 different heat-stable somatic O antigens, more than 100 heat-labile K antigens, and more than 50 H antigens. (True/False)
Enterobacteriaceae are classified by more than 150 different heat-stable somatic O antigens, more than 100 heat-labile K antigens, and more than 50 H antigens. (True/False)
Most gram-negative enteric bacteria produce exotoxins of clinical importance. (True/False)
Most gram-negative enteric bacteria produce exotoxins of clinical importance. (True/False)
The enteric bacteria generally do not cause disease and may even contribute to normal function and nutrition in the intestine. (True/False)
The enteric bacteria generally do not cause disease and may even contribute to normal function and nutrition in the intestine. (True/False)
When clinically important infections occur, they are usually caused by E coli, while other enteric bacteria cause hospital-acquired infections. (True/False)
When clinically important infections occur, they are usually caused by E coli, while other enteric bacteria cause hospital-acquired infections. (True/False)
The most frequent sites of clinically important infection by Enterobacteriaceae include the urinary tract, biliary tract, and other sites in the abdominal cavity. (True/False)
The most frequent sites of clinically important infection by Enterobacteriaceae include the urinary tract, biliary tract, and other sites in the abdominal cavity. (True/False)
The natural habitat of Enterobacteriaceae is primarily the skin of humans and animals.
The natural habitat of Enterobacteriaceae is primarily the skin of humans and animals.
All enteric organisms in the Enterobacteriaceae family are part of the normal microbiota and do not cause disease.
All enteric organisms in the Enterobacteriaceae family are part of the normal microbiota and do not cause disease.
Enterobacteriaceae are strictly anaerobic and do not possess the ability to thrive in the presence of oxygen.
Enterobacteriaceae are strictly anaerobic and do not possess the ability to thrive in the presence of oxygen.
All members of the Enterobacteriaceae family share identical antigenic structures.
All members of the Enterobacteriaceae family share identical antigenic structures.
Enterobacteriaceae do not produce any toxins or virulence factors that contribute to their pathogenicity.
Enterobacteriaceae do not produce any toxins or virulence factors that contribute to their pathogenicity.
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