Question 1

Match the microscopic morphology with the most likely agent.
-Coccobacilli or small rods

Accepted Answer

A)  H. haemolyticus
B)  H. influenzae biotype aegypticus
C)  H. influenzae
D)  H. segnis
E)  H. parainfluenzaeF) A) and B)
G) A) and C)

Question 2

Match the microscopic morphology with the most likely agent.
-Long, slender rods

Accepted Answer

A)  H. haemolyticus
B)  H. influenzae biotype aegypticus
C)  H. influenzae
D)  H. segnis
E)  H. parainfluenzaeF) None of the above
G) C) and D)

Question 3

Of the following media, which provides the NAD necessary for the growth of Haemophilus spp.?

Accepted Answer

A)  5% sheep blood agar
B)  Brain heart infusion agar
C)  Chocolate agar
D)  Nutrient agar
E)  All of the above are correct.F) A) and D)
G) None of the above

Question 4

Match the microscopic morphology with the most likely agent.
-Small coccobacilli or short rods with occasional cells appearing as tangled filaments

Accepted Answer

A)  H. haemolyticus
B)  H. influenzae biotype aegypticus
C)  H. influenzae
D)  H. segnis
E)  H. parainfluenzaeF) A) and B)
G) A) and E)

Question 5

With one exception, species of the genus Haemophilus require hemin and nicotine adenine dinucleotide (NAD)  for in vitro growth.Which is the exception?

Accepted Answer

A)  Haemophilus influenzae.
B)  H.ducreyi.
C)  H.aphrophilus.
D)  H.parainfluenzae.E) All of the above
F) A) and B) C

Question 6

The major difference between infections caused by type b H.influenzae and those infections caused by nontypeable strains is that

Accepted Answer

A)  infections caused by type b H.influenzae are often systemic and life-threatening.
B)  infections caused by other Haemophilus spp.occur much more frequently.
C)  the number of type b H.influenzae infections has been greatly increased.
D)  All of the above are correct.
E)  None of the above are correct.F) B) and D)
G) B) and C)

Question 7

Actinobacillus actinomycetemcomitans can be distinguished from Haemophilus aphrophilus by

Accepted Answer

A)  its negative test for catalase.
B)  its positive test for lactose fermentation.
C)  its positive test for catalase.
D)  its negative test for oxidase.
E)  All of the above are correct.F) A) and B)
G) A) and E)

Question 8

Isolates from eye swabs that are gram-negative coccobacilli, grow on chocolate agar in CO₂ but not blood agar, and are porphyrin-negative and nonhemolytic on rabbit or horse blood may be identified as

Accepted Answer

A)  Haemophilus parainfluenzae.
B)  H.influenzae.
C)  H.aphrophilus.
D)  H.influenzaeE) All of the above
F) None of the above

Question 9

Match the microscopic morphology with the most likely agent.
-Small pleomorphic rods or long filamentous forms

Accepted Answer

A)  H. haemolyticus
B)  H. influenzae biotype aegypticus
C)  H. influenzae
D)  H. segnis
E)  H. parainfluenzaeF) C) and E)
G) B) and D)

Question 10

Of the following media, which provides the factors necessary for the growth of Haemophilus spp.?

Accepted Answer

A)  5% sheep blood agar
B)  Brain heart infusion agar
C)  Chocolate agar
D)  Nutrient agar
E)  All of the above are correct.F) B) and D)
G) A) and B)

Question 11

Growth of H.ducreyi in culture requires

Accepted Answer

A)  incubation at 33° to 35° C.
B)  high humidity.
C)  increased CO₂.
D)  special media.
E)  All of the above are correct.F) C) and D)
G) All of the above

Question 12

Isolates from CSF that are gram-negative coccobacilli, grow on chocolate agar in CO₂ but not blood agar, require factor V but not X, and are nonhemolytic on rabbit or horse blood may be identified as

Accepted Answer

A)  Haemophilus parainfluenzae.
B)  H.influenzae.
C)  H.aphrophilus.
D)  H.influenzaeE) A) and D)
F) A) and C)

Question 13

Isolates from CSF or respiratory tract specimens that are gram-negative coccobacilli, grow on chocolate agar in CO₂ but not blood agar, and are porphyrin-negative and nonhemolytic on rabbit or horse blood may be identified as

Accepted Answer

A)  Haemophilus parainfluenzae.
B)  H.influenzae.
C)  H.aphrophilus.
D)  H.influenzaeE) A) and D)
F) C) and D)

Question 14

Match the microscopic morphology with the most likely agent.
-Short to medium-length bacilli

Accepted Answer

A)  H. haemolyticus
B)  H. influenzae biotype aegypticus
C)  H. influenzae
D)  H. segnis
E)  H. parainfluenzaeF) A) and E)
G) D) and E)

Question 15

In a phenomenon known as satelliting, tiny colonies of Haemophilus spp.may be seen growing on sheep blood agar very close to colonies of bacteria that can produce

Accepted Answer

A)  hemin.
B)  nicotine adenine dinucleotide (NA
D)  .
C)  vitamin K.
D)  cysteine.E) B) and D)
F) B) and C)

Question 16

Chancroid is the sexually transmitted disease caused by

Accepted Answer

A)  Haemophilus influenzae.
B)  H.ducreyi.
C)  H.aphrophilus.
D)  H.parainfluenzae.E) B) and D)
F) A) and C) B

Question 17

In a phenomenon known as satelliting, tiny colonies of Haemophilus spp.may be seen growing on sheep blood agar very close to colonies of

Accepted Answer

A)  Streptococcus pyogenes.
B)  Staphylococcus aureus.
C)  Micrococcus species.
D)  other Haemophilus species.E) A) and C)
F) A) and B)

Question 18

Growth of most Haemophilus species in culture is enhanced by

Accepted Answer

A)  incubation at 33° to 35° C.
B)  high humidity.
C)  5% to 10% carbon dioxide (CO₂) .
D)  enriched special media.
E)  All of the above are correct.F) A) and C)
G) C) and E) C

Question 19

H.ducreyi requires what special media to grow?

Accepted Answer

A)  Heart infusion-based agar supplemented with 10% IsoVitaleX and vancomycin
B)  Mueller-Hinton-based chocolate agar, supplemented with 1% IsoVitaleX and vancomycin
C)  Heart infusion-based chocolate agar, supplemented with 10% fetal bovine serum and vancomycin
D)  Mueller-Hinton-based agar, supplemented with 10% IsoVitaleX and vancomycinE) All of the above
F) A) and C)

Question 20

Match the microscopic morphology with the most likely agent.
-Pleomorphic rods

Accepted Answer

A)  H. haemolyticus
B)  H. influenzae biotype aegypticus
C)  H. influenzae
D)  H. segnis
E)  H. parainfluenzaeF) A) and C)
G) D) and E)

Exam 31: Haemophilus

Match the microscopic morphology with the most likely agent. -Coccobacilli or small rods

Correct AnswerverifiedShow Answer

Match the microscopic morphology with the most likely agent. -Long, slender rods

Correct AnswerverifiedShow Answer

Of the following media, which provides the NAD necessary for the growth of Haemophilus spp.?

Correct AnswerverifiedShow Answer

Match the microscopic morphology with the most likely agent. -Small coccobacilli or short rods with occasional cells appearing as tangled filaments

Correct AnswerverifiedShow Answer

With one exception, species of the genus Haemophilus require hemin and nicotine adenine dinucleotide (NAD) for in vitro growth.Which is the exception?

Correct AnswerverifiedC

The major difference between infections caused by type b H.influenzae and those infections caused by nontypeable strains is that

Correct AnswerverifiedShow Answer

Actinobacillus actinomycetemcomitans can be distinguished from Haemophilus aphrophilus by

Correct AnswerverifiedShow Answer

Isolates from eye swabs that are gram-negative coccobacilli, grow on chocolate agar in CO₂ but not blood agar, and are porphyrin-negative and nonhemolytic on rabbit or horse blood may be identified as

Correct AnswerverifiedShow Answer

Match the microscopic morphology with the most likely agent. -Small pleomorphic rods or long filamentous forms

Correct AnswerverifiedShow Answer

Of the following media, which provides the factors necessary for the growth of Haemophilus spp.?

Correct AnswerverifiedShow Answer

Growth of H.ducreyi in culture requires

Correct AnswerverifiedShow Answer

Isolates from CSF that are gram-negative coccobacilli, grow on chocolate agar in CO₂ but not blood agar, require factor V but not X, and are nonhemolytic on rabbit or horse blood may be identified as

Correct AnswerverifiedShow Answer

Isolates from CSF or respiratory tract specimens that are gram-negative coccobacilli, grow on chocolate agar in CO₂ but not blood agar, and are porphyrin-negative and nonhemolytic on rabbit or horse blood may be identified as

Correct AnswerverifiedShow Answer

Match the microscopic morphology with the most likely agent. -Short to medium-length bacilli

Correct AnswerverifiedShow Answer

In a phenomenon known as satelliting, tiny colonies of Haemophilus spp.may be seen growing on sheep blood agar very close to colonies of bacteria that can produce

Correct AnswerverifiedShow Answer

Chancroid is the sexually transmitted disease caused by

Correct AnswerverifiedB

In a phenomenon known as satelliting, tiny colonies of Haemophilus spp.may be seen growing on sheep blood agar very close to colonies of

Correct AnswerverifiedShow Answer

Growth of most Haemophilus species in culture is enhanced by

Correct AnswerverifiedC

H.ducreyi requires what special media to grow?

Correct AnswerverifiedShow Answer

Match the microscopic morphology with the most likely agent. -Pleomorphic rods

Correct AnswerverifiedShow Answer

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C

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B

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C

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