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VMCB 312: Pathogenic Bacteriology and Mycology > Lesson 3: Genus Actinobacteria, Nocardia and Dermatophilus > Flashcards

Lesson 3: Genus Actinobacteria, Nocardia and Dermatophilus Flashcards

1
Q

General Description

A
  • gram-positive bacteria
  • slow growth on lab media
  • opportunistic pathogen
  • actinomyces, arcanobacterium, actinobaculum
  • nocardia species
  • dermatophilus congolensis
  • crosiella equi
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2
Q

actinomyces, arcanobacterium, and actinobaculum species

A
  • anaerobic or facultative anaerobic
  • morphologically heterogeneous
  • non-spore forming, non-motile
  • ziehl-neelsen-negative
  • colonize mucous membranes
  • required enriched growth media for growth
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3
Q

Actinomyces pyogenes- Corynebacterium pyogenes- Arcanobacterium pyogenes- Trueperella pyogenes

A
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4
Q

nocardia species

A
  • aerobic, non-motile
  • gram-positive
  • spores from aerial filaments
  • growth on Sabouraud dextrose sugar
  • ziehl-Neelsen-positive
  • soil saprophytes
  • long, slender, rods and cocci in smears
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5
Q

Dermatophilus congolensis

A
  • gram-positive, filamentous, branching
  • aerobic and capnophilic
  • motile coccal zoospores 1.5 um
  • no growth on sabouraud dextrose sugar
  • found in scabs and in foci on skin of carrier animals
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6
Q

associated with equine nocardiform placentitis, leading to loss of the foal in approximately 50% of cases

A

crosiella equi

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7
Q

Class: Actinobacteria
Order: Actinomycetalis
Sub-order: Actinomycinaeae
Family: Actinomycetaeae
Genus: Actinomyces

A

Species; A. bovis, A. viscosus, A. hordeovulneris

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8
Q

Genus: Actinobaculum

A

Species: A. suis

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9
Q

Genus: Arcanobacterium

A

species; A. pyogenes

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10
Q

Suborder: Corynebacterinaeae
Family: Corynebacteriaceae
Genus: Mycobacterium

A

Species; M. bovis, M. avium, M. paratubercolusis

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11
Q

Genus: Corynebacterium

A

Species; C. pseudotubercolusis, C. pilosum, C. renali

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12
Q

Genus: Rhodococcus

A

Specie; R. equi

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13
Q

Genus: Nocardia

A

Species; N. asteroides, N. farcinica

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14
Q

Suborder: Micrococcinaeae
Family: Dermatophilaceae
Genus: Dermatophilus

A

Specie; D. congolensis

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15
Q

Suborder: Pseudocardinaeae
Family: Pseudocarcidiaceaea
Genus: Crosiella

A

specie; C. equi

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16
Q

Produces pyolisin and adhesins

A

Trueperella pyogenes

17
Q

an opportunistic pathogen and is a common cause of suppurative lesions in many domestic species worldwide, especially cattle, pigs and sheep

A

infection with Trueperella pyogenes

18
Q

caused by Actinomyces viscosus which result to subcutaneous pyogranulomatous lesion and extensive fibrovascular proliferation on the peritoneal or pleural surfaces with sanguinopurulent exudate in the affected cavity.

A

Canine actinomycosis

19
Q

caused by Actinomyces bovis which result to chronic rarefying osteomyelitis following trauma to the mucosa from rough feed or through dental alveoli during tooth eruption

A

Bovine actinomycosis (lumpy jaw)

20
Q

This specific disease, which affects the urinary tract of pregnant sows, is transmitted at coitus and is potentially fatal.

A

Porcine cystitis and pyelonephritis

21
Q

are usually confined to the epidermis. Dx: clinical signs and lesions. Tx: Penicillin-Streptomycin

A

Infections with D. congolensis

22
Q

similar to actinomycosis. Tx: Amikacin, imipenem-cilastatin and cotrimoxazole

A

Nocardia sp. infections

23
Q

contain both acidic as result it has affinity for both acidic and basic components of the cell

A

Giemsa staining

24
Q

Specimens suitable for laboratory examination include scab material and sample of skin fixed in formalin

A

Dermatophilosis

25
Q

test organism is cultured in a medium which contain urea (phenol red)

A

urease test

26
Q

specimens suitable for laboratory examination include exudates, aspirates, mastitic milk tissue from granulomas and fixed tissue for histopathology to reveal clusters of nocardial filaments

A

Nocardia sp.

27
Q

when activated, produce germ tubes and these develop into filaments which invade the epidermis. invasion leads to an acute inflammatory response characterized by large numbers of neutrophils which ultimately form microabscesses in the epidermis

A

Dermatophilus congolensis zoospores

VMCB 312: Pathogenic Bacteriology and Mycology (23 decks)

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