Week 6 Micro Canvas Questions

Gardnerella vaginalis

Pleomorphic gram-positive to gram-variable bacillus

Bacillus anthracis

Large spore-forming GPB

Lactobacillus acidophilus

GPB with simple branching that produces acid

Erysipelothrix rhusiopathiae

Thin GPB appearing in chains that is H2S positive

Nocardia asteroides

Partially acid fast, branching GPB

Corynebacterium diphtheriae

Pleomorphic, club-shaped, branching GPB

Listeria monocytogenes

Tiny motile GPB that can grow at 25 degrees Celsius and 35 degrees Celsius

Bacillus cereus is isolated in a case of gastroenteritis. Which of the following is incorrect for this organism?

A) Motile

B) Nonhemolytic on sheep blood agar

C) Starch hydrolysis positive

D) Produces acid from glucose, maltose, and salicin

B) Nonhemolytic on sheep blood agar

Which of the following bacteria are non-spore formers with a pleomorphic or diphtheroid appearance?

A) Bacillus and Listeria

B) Corynebacterium and Listeria

C) Lactobacillus and Nocardia

D) Actinomyces and Gardnerella

B) Corynebacterium and Listeria

Which species of Corynebacterium was first characterized in 1976 as a multidrug-resistant agent in a variety of clinical infections and is now a significant opportunistic pathogen?

A) C. diphtheriae

B) C. ulcerans

C) C. pseudotuberculosis

D) C. jeikeium

D) C. jeikeium

Which of the following is true of Streptomyces?

A) Is a cause of actinomycetoma

B) Is a thermophilic actinomycete

C) Is a non-acid-fast aerobic actinomycete

D) Is a rare cause of zoonotic infections

A) Is a cause of actinomycetoma

True or False? Pulmonary anthrax is commonly known as woolsorter's disease.

A) True

B) False

A) True

True or False? The virulence of Corynebacterium diphtheriae is attributed to its destructive endotoxin.

A) True

B) False

B) False

The spinal fluid of a newborn is received in the laboratory. The Gram stain shows a moderate amount of a tiny Gram-positive diphtheroid along with neutrophils. The specimen is plated onto sheep blood agar, chocolate agar and MacConkey agar. You would expect it to grow on

.A) all three of these agar plates

B) the blood agar and MacConkey agar plates

C) the blood agar and chocolate agar plates

D) none of these agar plates

C) the blood agar and chocolate agar plates

The spinal fluid of a one week old infant is received in the laboratory.. The Gram stain shows a moderate amount of a tiny Gram positive diphtheroid along with neutrophils . The mother has been working in a pet store and has been suffering from gastroenteritis for about a week. Additional testing of the isolate revealed it to be catalase positive, oxidase negative, bile esculin positive, and H2S negative. A co-worker suggests that considering the mother's occupation this organism should be worked up as an Erysipelothrix. You disagree because Erysipelothrix is

A) catalase negative

B) nonhemolytic or alpha-hemolytic

C) H2S positive

D) all of these are correct

D) all of these are correct

A) catalase negative

B) nonhemolytic or alpha-hemolytic

C) H2S positive

All of the following are non-spore-forming gram-positive bacilli, except:

A) Bacillus.

B) Listeria.

C) Corynebacterium

D) Erysipelothrix.

A) Bacillus.

Which of the following is associated with mycetoma?

A) Gardnerella

B) Erysipelothrix

C) Nocardia

D) Corynebacterium

C) Nocardia

Listeriosis may include which of the following?

A) Meningitis and conjunctivitis

B) Conjunctivitis and anthrax

C) Pneumonia and erysipeloid

D) Bacterial vaginosis and meningitis

A) Meningitis and conjunctivitis

Which Corynebacterium species produces a diphtheria-like toxin and is most often a zoonotic pathogen associated with cattle and unpasteurized milk?

A) C. urealyticum

B) C. ulcerans

C) C. pseudodiphtheriticum

D) C. jeikeium

B) C. ulcerans

True or False? The lactobacilli are generally considered to be normal microbiota.

True

True or False? Emetic toxin of Bacillus cereus is heat labile.

False

True or False? Nocardia is partially acid fast.

True

A Gram-positive diphtheroid which is not acid fast, and is a nonspore former, that a narrow zone of beta hemolysis was noted on the sheep blood agar plate. Which of the following is most correct?

A) The organism may be Bacillus anthracis

B) Nocardia can be eliminated as a possible choice.

C) This may be an aerotolerant Actinomyces

D) The organism may likely be Listeria or Lactobacillus

D) The organism may likely be Listeria or Lactobacillus

An organism is identified as Listeria monocytogenes and additional testing on the isolate would reveal it to:

A) be nonmotile

B) show umbrella-like growth in semisolid motility media

C) be unable to grow at 25C

D) all of these are correct

B) show umbrella-like growth in semisolid motility media