Filamentous - Nocardia/Actinomyces/Dermatophilus Flashcards Preview

RUSVM Bacteriology Gram Positives > Filamentous - Nocardia/Actinomyces/Dermatophilus > Flashcards

Flashcards in Filamentous - Nocardia/Actinomyces/Dermatophilus Deck (30)
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1

Nocardia - descriptive statement

Aerobic, gram positive, saprophytic, partially acid-fast

2

Nocardia - disease processes

Generalized suppurative & pyogranulomatous processes
Nocardia asteroides=Most common species

3

Nocardia Transmission

Soil & water, inhalation, trauma & ingestion

4

Nocardia - diseases

Immunodeficiency in humans & animals - Bovine mastitis!

5

Nocardia pathogenesis

Suppurative - Variable granulomatous features - Lymph nodes involvement

6

Nocardia in ruminants

Mastitis! Bovine Farcy! Pneumonia - Abortion - Lymphadenitis

7

Bovine Farcy DDx!***

Nocardia farcinca - Mycobacterium farcinogenes -M. senegalense

8

Nocardia in horses/swine

Immunosuppressed animals - Nocardioform placentitis- actually caused by Crossiella equi

9

Nocardia in dogs/cats

Debilitating, febrile illness, LUMPY JAW

10

When I say Lumpy Jaw in dogs/cats, you say...

Nocardia cyriacigeneorgica

11

Actinomyces - Where is it found

Found on oral MM, tooth surfaces, endogenous - infectious - sometimes from bites

12

Actinomyces pathology

Pyogranulomatous reactions! - Lumpy Jaw in Ruminants, humans & marsupials

13

When I say Lumpy Jaw in Ruminants, humans & marsupials, you say...

Actinomyces bovis!

14

Actinomyces bovis pathogenesis

A bovis: oral mucosa--> traumatic event to mandible (alveolar/paralveolar regions) --> chronic rarefying osteomyelitis --> replacement with porous bone, dislodge teeth, can't chew, mandibular fractures

15

Main difference from Actinomyces bovis and Nocardiosis?

Actinomyces bovis is very unlikely to disseminate. Stays local, in jaw

16

Actinomyces in horse

Poll evil and fistulous withers (consider DDx), some cervical lymphadenitis

17

Actinomyces in Dogs & Cats

A. viscosus - Suppurative serositis, discospondylitis, cutaneous=rare (nodulo-ulcerative lymphangitis)

18

Actinomyces in Swine

Mastitis, abortion, pneumonia

19

How to treat Actinomyces infection>

Iodine compounds (careful with toxicity)

20

Dermatophilus congolensis

Exudative epidermitis

21

Dermatophilus in cattle

Dermatophilosis or streptothricosis

22

Dermatophilus in horses

Rain scald - rain rot - grease heal

23

When I say Rain scald, rain rot, grease heal, you say...

Dermatophilus in horses

24

When I say strawberry foot rot & lumpy wool in sheep, you say...

Dermatophilus in sheep

25

What environment is best for dermatophilus?

WET & tropical - high humidity! (Africa & caribbean)

26

How is dermatophilus spread?

Contact - Fomites - Tick vector (Ambylomma variegatum)

27

What species of tick spreads dermatophilus?

Amblyomma variegatum

28

What stain is best for dermatophilus?

Giemsa

29

What do Dermatophilus congolensis look like under the microscope?

Train tracks!

30

What is a characteristic sign of Dermatophilus infection?

Paintbrush appearance of removed crust & hair