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RUSVM Bacteriology Gram Negatives > Actinobacillus > Flashcards

Flashcards in Actinobacillus Deck (17)
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1
Q

Actinobacillus - General description

A

Member of Family Pasturellaceae - Gram negative coccobacillis - “Morse Code” appearance - facultative anaerobe - Oxidase positive - Most urease positive - CAMP positive with Staph aureus - Cannot live in environment, need carriers for transmission

2
Q

Actinobacillus - Commensals

A

Upper respiratory & oral cavity - Opportunistic pathogens

3
Q

Actinobacillus - target cells

A

Nasal cavity & tonsillar crypts (of carrier animals) ; Terminal bronchioles & alveoli (of pre-diseased animals) - Causes Lower Respiratory Tract diesease

4
Q

Actinobacillus- Pathogenesis

A

Contamination–> Inflammatory response (LPS, Urease) –> Bacteria survives, colonize, replicates–> septicemia (capsule, OMP, RTX toxin) –> Full disease

5
Q

Actinobacillus - Clinical signs

A

Suppurative lung lesions - Granuloma formation in ruminant tongue & lymph nodes (Wooden Tongue*****)

6
Q

When I say Wooden Tongue, you say…

A

Actinobacillus! in ruminants (A. lignieresii)

7
Q

A. ligniersii - in ruminants

A

Wooden/Timber tongue!!! - Normal flora of nasopharynx - Introduced by trauma (plant) - May interfere with food intake –> weight loss–> dehydration

8
Q

Common confusion with A. ligniersii

A

Often confused with Lumpy Jaw (actinoMYCOSIS) - Actinomycosis in BONE / Actinobacillus in soft tissue

9
Q

Actinobacillus in rams

A

A. seminis - Epididymitis in young rams - Purulent discharges

10
Q

Actinobacillus in swine - causative species and disease patterns

A

A. pleuropneumoniae - A. suis - A. equuli - Pneumonia and septicemia of young pigs in cold months (crowding/poor ventilation)

11
Q

Actinobacillus in swine - Acute presentation

A

High mortality - Septicemia- skin lesions as in swine erysipelas

12
Q

Actinobacillus in horses

A

Pneumonia, mixed infections with Strept. equi - Septicemia - Sleepy Foal Disease - A. equuli, Navel Ill - good hygiene practices important

13
Q

What causes Sleepy Foal disease in equines?

A

A. equuli

14
Q

Wooden tongue pathology

A

A. ligniersii - Cell-mediated Hypersensitivity - ABs in colostrum for piglets & foals - Ab’s against RTX - Vaccine protects against homologous serotypes only - Eliminate carrier sows

15
Q

Actinobacillus Fastidious-ness

A

Growth on blood agar requires V factor (NAD-dependent**)

16
Q

Actinobacillus on MacConkey agar

A

Most grow, A. pleuropneumoniae doesn’t

17
Q

Actinobacillus Tx -

A

Antimicrobials - Iodides orally or IV for wooden tongue