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RUSVM Bacteriology Exam 1 > Actinomyces, Trueperella, Dermatophilus > Flashcards

Actinomyces, Trueperella, Dermatophilus Flashcards

1
Q

Where is Actinomyces spp. found?

A

Mouth flora in animals and humans

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2
Q

What are the disease characteristics of Actinomyces spp?

A

Grow as colonies in center of lesion

Pyogenic response

Outer zone of lesion has granulomatous characteristics (chronic infection)

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3
Q

What kind of disease does Actinomyces cause?

A

Chronic, progressive, pyogranulomatous disease

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4
Q

Chronic infections of Actinomyces may cause what?

A

Bone lysis : Osteomyelitis

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5
Q

What does Actinomyces bovis cause?

A

Lumpy jaw: pyogranulomatous osteomyelitis

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6
Q

Gram stain of purulent material from Actinomyces bovis infection will reveal what?

A

Gram +, club shaped rods and filaments

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7
Q

What can be observed in the exudate of Actinomyces infections?

A

Sulphur granules

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8
Q

What is Actinomyces hordeovulneris associated with?

A

Fox tail grass awns

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9
Q

How would a Actinomyces infection be diagnosed?

A

Microscopically examine granules

Culture

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10
Q

What treatment is Actinomyces susceptible to?

A

Penicillin G, Iodides

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11
Q

What particular morphology does Dermatophilus congolensis have?

A

Divides in two planes to give “tram-track” appearance and produce coccoid fragments which become motile zoospores

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12
Q

A virulence factor of Dermatophilus congolensis is?

A

Keratinolytic activity

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13
Q

What kind of lesions are seen with Dermatophilus congolensis?

A

Epidermal abscesses with hyperkeratosis

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14
Q

What kind of treatment is used for Dermatophilus congolensis?

A

Systemic antibiotic treatment

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15
Q

What can Trueperella pyogenes cause?

A

Secondary bacterial pneumonia and abscessation

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16
Q

Why is Trueperella pyogenes important in cattle?

A

It is the most opportunistic pathogen in cattle

17
Q

What kind of infections does Trueperella pyogenes cause?

A

Purulent infections

Tendency to cause bacteremia

18
Q

Trueperella pyogenes creates what kind of conditions for others?

A

Anaerobic conditions

19
Q

What does Trueperella pyogenes create between organisms and toxins?

A

Cross-talk between organisms and synergy between toxins

20
Q

Actinobaculum suis is a commensal organism of what?

A

The preputial mucosa of boars

21
Q

How is Actinobaculum suis transmitted?

A

Sexually transmitted

22
Q

What can Actinobaculum suis cause?

A

Porcine cystitis (bladder inflammation)

Renal failure and death

RUSVM Bacteriology Exam 1 (11 decks)

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