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35 Cards in this Set
- Front
- Back
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Anaerobic, non-spore-forming, Gram-neg bacteria genus
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Bacteroides
Dichelobacter Fusobacterium Prevotella Porphyromonas |
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Obligate anaerobe common features
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Gram-negative
rods obligate anaerobes extracellular intestinal tract/rumen/mucous/membranes/environment |
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Obligate Anaerobe common disease processes
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Low Ox/reduction potential
suppurative lesions necrotic tissues as secondary pathogen with other abligate anaerobes and aerobic/facultative bacterium |
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Obligate Anaerobe disease processes
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abscesses in lung, liver brain
pyometra osteomyelitits post-surgical abscesses foot/claw abscesses cellulitis, periodontal abscesses guttural pouch infection suppurative mastitis enteric diarrhea |
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Obligate GM - anaerobe spp.
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Bacteroides fragilis
Dichelobacter nodosus Fusobacterium necrophorum Prevotella melaninogenica Porphyomonas spp. |
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Bacteroides virulence factor
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proteases
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Dichelobacter virulence factors
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fimbriae - Vx target
proteases |
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Fusobacterium virulence factors
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capsule
leukotoxin - VX target |
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Prevotella virulence factors
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proteases
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Porphyromonas
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Gingipains
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Obligate anaerobe laboratory diagnosis
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anaerobic specimen of infected tissues, pus
evacuated capped syringes culture with special reducing medium |
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Bovine liver abscesses
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Fusobacterium necrophorum
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Bovine liver abscess process
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after grain overload, lactic acid causes rumenitis, allows invasion of rumen wall, to portal vein, to liver, causes abscess with capsule, leukotoxin
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Bovine liver abscess is primarily from ____ but may also have ______.
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Fusobacterium necrophorum
Arcanobacterium pyogenes |
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Bovine Liver Abscesses prevention
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manage feed
vaccine to leukotoxin |
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Foot/claw abscesses in sheep
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contagious footrot of sheep
ovine interdigital dermatitis |
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Foot/claw abscesses in cattle
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interdigital dermatitis
interdigital necrobacillosis |
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Foot/claw abscesses in horses
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thrush
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contagious foot rot of sheep principal pathogen
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Dichelobacter nodosus
Fimbriae for attachment to epidermis virulent strains have proteases benign strains none |
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Fusobacterium necrophorum initiates infection and ???? infects as well
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arcanobacterium pyogenes, spirochetes
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Contagious footrot of sheep pathogenesis
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maceration of wet skin,
separation of horn from matirx toe to heel foul-smelling, necrotic exudate |
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Contagious footrot spp
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Fusobacterium necrophorum capsule/leukotoxin
inflammation/necrosis interdigital dermatitis Dichelobacter nodosus: interdigital dermatitis:mild strain contagious footrot:virulent strain |
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Dichelobacter survives in
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warm wet muddy conditions up to 4 days
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Dichelobacter prevention
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foot hygiene
isolation vaccination: fimbiral antigens, 9 serogroups/no cross-protection genetic selection for resistance |
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ovine interdigital dermatitis is caused by
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fusobacterium only
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If fusobacterium infects with virulent Dichelobacter it is
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Contagious foot rot.
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Ovine interdigital dermatitis is also called
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Scald
mild, superficial and self-limiting |
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Bovine interditial necrobacillosis spp
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Fusobacterium, necrophorum
Prevotella melaninogenica Arcanobacterium pyogenes |
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Bovine Interidigital Necrobacillosis pathogenesis
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maceration of wet skin
Fusobacterium necrophorum:capsule, leukotoxin, inflammation, necrosis Prevotella melaninogenica: proteases |
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Bovine interditial necrobacillosis presentations
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necrotizing dermatitis, foul-smelling, necrotic exudate
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Bovine interdigital necrobacillosis characteristics
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sporadic occurrence
less contagious treat topically prevent minimize foot trauma good foot hygiene vaccination |
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Equine foot infections
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Thrush
Fusobacterium necrophorum central sulcus of the frog hoof damage, entry, foul-smelling, necrotic exudate |
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Obligate anaerobe abscesses
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dogs/cats:bite wounds:humans
draining tracts pleural fluids Tx:drainage, antibiotics:pasteurella |
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Periodontal disease pathogenesis
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colonization by aerobic cocci
adhesion of aerobic rods:biofilm proliferation of aerobes: gingival inflammation:spirochetes |
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Periodontal disease microbiology
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Pathogen-related oral spirochetes
Porphyromonas spp P. gulae + Trivalent vaccine infect withing 24 hours of scaling |
