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Flashcards in Bacteriology Exam 2 Material Deck (137)
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1

What genus most closely fits the description “large Gram-positive rods, spore forming, anaerobic, causes several life- threatening diseases of animals and man, commonly by the production of powerful exotoxins”?

  • a. Actinomyces
  • b. Arcanobacterium
  • c. Bacillus
  • d. Clostridium
  • e. Corynebacterium

d. Clostridium

1

T/F: In order to produce enterotoxigenic diarrhea, E. coli must have either adhesins or enterotoxins

False.

In order to produce enterotoxigenic diarrhea, E. coli must have BOTH adhesins AND enterotoxins

2

What is the classic source of infection for Listeria?

contaminated silages

2

A pig (named Chris P. Bacon) presents to your clinic in severe respiratory distress... You kill him. Upon necropsy, you observe focal areas of necrotizing pneumonia in the dorsal and caudal portions of the lungs. Which bacterial organism should you have at the top of your differential list?

Actinobacillus pleuropneumoniae 

4

Lethal toxin, produced by Bacillus antracis, is composed of __________ and __________.

Lethal toxin, produced by Bacillus antracis​, is composed of protective antigen (PA) and lethal factor (LF).

PA is responsible for binding to host cells

LF is responsible for toxic activity (macrophages)

4

Which bacterial organism is known to cause Glässer’s diseases (polyserositis)

Haemophilus parasuis

5

T/F: All Actinobacillus spp. grow on MacConkey agar 

False

Actinobacillus pleuropneumoniae does not grow on MacConkey agar

6

This vegetative endocarditis of the right atrioventricular valve of a heifer was caused by which bacterial organism?

Erysipelothrix rhusiopathiae

6

Which two organisms that we've discussed show bipolar staining coccobacilli upon Gram stain?

Pasteurella and Yersinia

7

Which Mycobacterium spp grows at a higher temperature than the others? (~43°C)

Mycobacterium avium

8

T/F: Rhodococcus spp. contain mycolic acid

True

9

T/F: Animals who survive ascending tetanus acquire immunity from the disease

False.

Survivors are susceptible to re-infection; Not enough toxin present to induce a strong immune-response (neutralizing antibodies) 

9

What is the most common and most important bacterial cause of pyometra in dogs?

E. coli

9

Which bacterial organism is known to express Lipo-oligosaccharides (LOS)?

Histophilus somni

9

Does Yersinia ruckeri cause disease in freshwater or saltwater fish?

Yersinia ruckeri causes Enteric Redmouth in TROUT

Trout are freshwater fish

9

Bovine Thrombotic Meningoencephalitis is caused by which bacterial organism?

Histophilus somni 

10

What is the main virulence factor for Listeria?

Listeriolysin O (LLO)

It is a pore-forming cytolysin

11

T/F: Necropsy of animals suspected of carrying anthrax is required.

False.

11

T/F: Adhesins associated with Clostridium difficile function in adhesion to target cells in the small intestine

False.

Adhesion to target cells in the large intestine

12

Which Salmonella Pathogenicity Island (SPI) promotes survival in macrophages?

Salmonella Pathogenicity Island 2 (SPI-2)

13

When a blood smear containing Bacillus anthracis is stained with McFadyean's Methylene Blue stain, what color do the bacterial capsules stain?

pink

14

How are humans infected with P. multocida?

Wound infection (bites and scratches)

15

Circling Disease

(Cattle: Encephalitis, depression, anorexia, unilateral facial paralysis, bilateral keratoconjunctivitis)

Listeria

16

Attaching and effacing lesions are hallmarks of which disease(s)?

Enteropathogenic and enterohemorrhagic E. coli

16

T/F: Shigella is characterized by the presence of a capsule and flagella

Hell no.

No capsule, no flagella

16

Listeria spp. are motile at what temperature?

25°C

17

T/F: Yersinia pestis is usually more prevalent in colder months

False

Y. pestis is more prevalent during warmer months

18

T/F: Mannhaemia, Bibersteinia, and Pasteurella all exhibit growth on MacConkey Agar

False

Pasteurella typically does not grow on MacConkey

19

All except one of the following virulence determinants can occur in Gram-positive bacteria. Which is the exception?

  • a. capsule
  • b. endotoxin
  • c. exotoxin
  • d. hyaluronidase
  • e. survival in phagocytes

b. endotoxin

20

Is the organism that causes strawberry footrot in sheep Gram-positive or Gram-negative?

Dermatophilus congolensis is the organism responsible for strawberry footrot in sheep.

It is Gram-positive!!