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Microbiology 386 > Ery > Flashcards

Ery Flashcards

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1
Q

Which species doe E. rhusiopathiae affect?

A
  1. Swine
  2. Turkey
  3. Humans
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2
Q

Which gram + organism produces a black line in the kligler’s medium?

A

E. rhusiopathiae

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3
Q

What does E. rhusiopathiae look like microscopically?

A

Gram + rod

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4
Q

What does E. rhusiopathiae look like in culture?

A
  • Tiny, clear colonies
  • Alpha hemolysis
  • Slow growing
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5
Q

What is this organism?

A

E. rhusipathiae

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6
Q

What test results would lead you to believe an unknown is Erysipelothrix rhusiopathiae?

  1. Catalase
  2. H2S
  3. Motility
A
  1. Negative
  2. Positive
  3. “Test tube brush motility”
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7
Q

What is the typical habitat of E. rhusiopathiae?

A

Tonsils of about 30-50% of swine

Excreted in urine and feces

In soil for months

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8
Q

There are 3 manifestation of E. rhusiopathiae in swine. What are they?

A
  1. Acute form
    • Septicemia
    • Lameness
    • Fever
    • Death
  2. Skin form
    • Diamond skin disease
  3. Chronic form
    • Endocarditis
    • Arthritis
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9
Q

What causes the diamond skin disease to show up in this disease?

A

Thrombi occlude the blood supply to areas of the skin

These areas become necrotic

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10
Q

How might a turkey be infected with Erysipelothrix rhusiopathiae?

A

Fight wounds –> Septicemia

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11
Q
  1. What was this pig’s condition called?
  2. What other abnormal conditions might this pig suffer from?
A

Chronic Erysipelothrix rhusiopathiae

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12
Q

What symptom might a turkey have infected with E. rhusiophathiae?

A

Swollen head

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13
Q

What is the most common entry point for an E. rhusiopathiae infection?

A

Wounds

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14
Q

If a fishman recalls being stuck by a fish and later develops a focal, burning, itchy lesion on his hand, what organism might you be concerned about?

A

Erysipelothrix rhusiopathiae

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15
Q

What might be your go-to drug for an pig infected with Ery?

A

Penicillin

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16
Q

What does Corynebacterium look like microscopically?

A

Gram + rod

Club shaped

Palisades (parallel groups)

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17
Q

Ture or false:

Corynebacterium form spores.

A

FALSE

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18
Q

What are the following test results with Corynebacterium renale?

  1. Catalase
  2. Urease
  3. Hemolysis
A
  1. Positive
  2. Positive (RAPID - WITHIN MINUTES!)
  3. Non-hemolytic
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19
Q

What problem(s) can Corynebacterium renale cause in cattle?

A

Pyelonephritis

20
Q

What problem(s) can Corynebacterium renale cause in sheep?

A

Pizzle rot

21
Q

What is the NORMAL habitat of Corynebacterium renale?

A

Urethra & prepuce

Cattle & sheep

22
Q

What is your drug of choice in treating an infection of Corynebacterium renale?

A

Penicillin

23
Q

Explain the pathogenesis of pizzle rot in a sheep infected with Corynebacterium renale

A
  • Excessive protein in the diet
  • Leads to increased urea in the urine
  • C. renale breaks down urea into ammonia
  • Ammonia is irritating to the mucosa
  • Inflammation may cause blockage of urination
24
Q

There are 2 biovars of Corynebacterium pseudotuberculosis.

  1. What are they?
  2. What do they cause?
A
  1. Ovis
    • Caseous lymphadenitis
  2. Equi
    • Abscesses
    • Ulcerative lymphangitis

*** Both cause abscesses in cattle ***

25
Q

What is the difference between biovars in biochemical testing?

A

Biovar ovis : nitrate negative

Biovar equi : nitrate positive

26
Q

What is this organism?

A

Corynebacterium pseudotuberculosis

27
Q

True or False:

  1. Corynebacterium pseudotuberculosis is alpha hemolytic.
  2. Corynebacterium pseudotuberculosis is urease negative.
A
  1. FALSE: narrow zone of BETA hemolysis
  2. FALSE: urease POSITIVE
28
Q

There are 2 toxins for C. pseudotuberculosis.

  1. What are they?
  2. What are their functions/characteristics?
A
  1. Phospholipase D
    • Lethal
    • Weak hemolysin
    • Dermonecrotic
  2. Surface lipid
    • Toxic for phagocytes
29
Q

What is the normal habitat for C. pseudotuberculosis?

A

Skin

Sheep & goats

30
Q
  1. What type of parasite is C. pseudotuberculosis?
  2. What environmental condition does it prefer for optimal growth?
A
  1. Falcultative intracellular parasite
  2. Anaerobic environment
31
Q

How might Corynebacterium pseudotuberculosis affect a horse?

A

Biovar equi can cause ulcerative lymphangitis

Infection starts as a wound or abscess and affects the lymph nodes of the legs

32
Q

What type of immunization is available?

A

Bacterin-toxoid

(Poor efficacy @ 40%)

33
Q

What disease processes can Rhodococcus equi cause?

A

Enteritis

Bronchopneumonia

Arthritis

34
Q

What is the hemolytic pattern of R. equi?

A

Non-hemolytic

35
Q

Explain the colony morphology of R. equi

A

Moist

Mucoid

Flowing

36
Q

What is the morphology of R. equi microscopically?

A

Large rod

Pleomorphic - ranging to cocci

Gram +

37
Q
  1. Of the organisms in this set of flascards, which one is illustrated?
  2. What is the urease test for this organism?
A
  1. Rhodococcus equi
  2. Urease positive
38
Q

What is the natural habitat of Rhodococcus equi?

A

Common commensal of the horse

GI tract - especially in YOUNG animals

Soil - especially in equine pastures

39
Q

What might Rhodococcus equi be able to be isolated from an infected pig?

A

Lymph nodes

40
Q

What is your treatment of choice for Rhodococcus equi?

A

Erythromycin (long acting macrolid) + Rifampin

41
Q

What type of environment is optimal for Actinobaculum suis for growth?

A

Anaerobic environment

42
Q

What type of disease process is associated with A. suis in pigs?

A

Pyelonephritis

43
Q
  1. What is this organism?
  2. Which feature tells you this?
A
  1. Truperella pyogenes
  2. Tappering tails on both ends
44
Q

Trueperella pyogenes test results:

  1. Catalase
  2. Litmus
  3. Casein agar
A
  1. Negative
  2. ACP
  3. Digestion
45
Q

What is the morphology of Trueperella pyogenes microscopically?

A
  1. Short rods
  2. Tapered ends (sometimes)
  3. Non-encapsulated
  4. Chinease letters
46
Q

What is the colony morphology of Trueperella pyogenes?

A
  1. Small
  2. Beta hemolysis
47
Q
A

Microbiology 386 (14 decks)

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