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Why can direct microscopy not be used to provide a presumptive identification of the enteric bacteria?


A) Some members of the genus Gram stain weakly.
B) The microscopic characteristics are indistinguishable from other gram-negative bacteria.
C) Some members of the genus do not decolorize well and appear gram-positive.
D) Some members have very thick capsules, and these do not allow the penetration of the Gram stain.

E) A) and D)
F) C) and D)

Correct Answer

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In the carrier state, where are pathogenic salmonella carried?


A) Gallbladder
B) Liver
C) Intestines
D) Stomach

E) B) and C)
F) A) and B)

Correct Answer

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Which of the following agars is not selective for Enterobacteriaceae?


A) Buffered charcoal yeast extract
B) MacConkey
C) Hektoen enteric
D) Xylose-lysine deoxycholate

E) A) and B)
F) B) and D)

Correct Answer

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What are the primary antigens used in serologic grouping of salmonellae?


A) Somatic A antigen and flagellar O antigens
B) Capsular A antigen and somatic O antigen
C) Flagellar H antigen and capsular A antigen
D) Flagellar H antigen and somatic O antigen

E) B) and C)
F) A) and B)

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A microbiologist is reading a stool culture and notices a very moist and mucoid pink colony on MacConkey agar.What is the most likely organism?


A) Klebsiella pneumoniae
B) Escherichia coli
C) Proteus vulgaris
D) Acinetobacter

E) A) and C)
F) None of the above

Correct Answer

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What two bacteria produce swarming colonies on nonselective media, such as sheep blood agar (SBA) ?


A) Enterobacter aerogenes and Serratia marcescens
B) Proteus pannier and Klebsiella pneumoniae
C) P.vulgaris and P.mirabilis
D) P.mirabilis and Escherichia coli

E) B) and C)
F) A) and D)

Correct Answer

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The Escherichia coli serotype O157:H7 is associated with all the following except:


A) hemorrhagic diarrhea.
B) colitis.
C) liver damage.
D) hemolytic-uremic syndrome.

E) A) and C)
F) A) and D)

Correct Answer

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Why is it that most cases of salmonella food poisoning are not treated with antibiotics?


A) The organisms are very resistant to antibiotics.
B) Antibiotics cannot reach the organisms, because they are deeply embedded in the intestinal walls.
C) Antibiotics would only kill the bacteria, then release the endotoxins into the blood, making things worse.
D) The disease is self-limiting and will subside on its own.

E) B) and D)
F) B) and C)

Correct Answer

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What organism possesses the Vi antigen?


A) Salmonella typhi
B) S.sonnei
C) Shigella sonnei
D) Citrobacter freundii

E) B) and C)
F) A) and D)

Correct Answer

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All the following are biochemical features of Salmonella except:


A) lactose positive.
B) indole negative.
C) hydrogen sulfide positive.
D) Voges-Proskauer (VP) negative.

E) A) and B)
F) None of the above

Correct Answer

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