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Exam 16: Aerobic Gram-Positive Bacilli

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Question 1

Multiple Choice

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What other gram-positive rod is similar to Bacillus anthracis morphologically and metabolically?

A) B. subtilis
B) B. cereus
C) L. monocytogenes
D) E. rhusiopathiae

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

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B

Question 2

Multiple Choice

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What organism is responsible for spontaneous abortion and stillborn neonates, and can cause meningitis with a fatality rate approaching 50% in newborns?

A) Corynebacterium diphtheriae
B) Rhodococcus equi
C) Rothia dentocariosa
D) Listeria monocytogenes

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

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Question 3

Multiple Choice

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What is the name of the organism that, before being identified as an important cause of infections in immunocompromised patients, was considered a common laboratory contaminant?

What bacterium produces colonies that are nonhemolytic, large, gray, and flat with an irregular margin on SBA?

A young girl is brought to her physician by her mother, who says the child has been very sluggish with a fever of 38° C (100.5° F) for a week. The mother noticed that the child's tonsils were red and that the previous day the back of her throat turned a gray color and looked to have a gray membrane on it. What disease should the physician suspect?

What antibiotic, in 2000, was approved by the U.S. Food and Drug Administration (FDA) for postexposure inhalation anthrax?

All the following tests should be performed by sentinel laboratories to rule out the possibility of Bacillus anthracis from an isolate, except

The three proteins that make up the anthrax toxin include all the following, except

What organism is a member of the human oropharyngeal biota but has been isolated from people with endocarditis?

All the following are general characteristics of the genus Bacillus, except

Several people from a picnic came down with a gastrointestinal disturbance, and public health officials suspected a case of food poisoning. The food was cultured, and after 24 hours of incubation the hot dogs yielded growth on SBA of small, round, smooth, translucent colonies surrounded by a narrow zone of $\beta$ -hemolysis. A Gram stain showed gram-positive coccobacilli. Motility medium was inoculated and an umbrella pattern of motility was observed at room temperature. What organism was isolated as the cause of the illness?

How is anthrax spread in animals?

Colonies of Bacillus anthracis are described as

What bacteria's morphology is described as large, square-ended, gram-positive or gram-variable rods found singly or in chains?

One of the foremen at a pig farm notices purple sores on one of his workers. The worker has not been feeling well for the past 2 weeks, so the foreman sends him to the physician. The physician takes scrapings from the lesions and sends them to the laboratory for a culture. The Gram stain shows 3+ thin, gram-positive rods that have filaments. The culture plates were examined the next day and revealed nonhemolytic, pinpoint, transparent colonies. What is the most likely pathogen?

What organisms are described as partially acid fast and diphtheroid gram-positive rods with traces of branching on a Gram stain?

What is the name of the group of bacteria that are gram-positive rods often referred to as club-shaped or V & L forms when viewed in a Gram stain?

What is one of the most frequently isolated, clinically significant corynebacteria associated with UTIs?

What is the name of the genus whose members are called nocardioforms?

What is the colony morphology of A. haemolyticum on SBA?