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Bact: Pathogenesis Factors
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3 Primary Bacterial Pathogenesis Factos:
Host Susceptibility
Bacterial Infectivity
Virulence Factors
What alters host susceptibility?
Species
Age
What alters bacterial infectivity?
Strain
Genetic Variation
What alters virulence factors?
Pili
Non-fimbrial adhesions
Capsule
Toxins
Mannheimia haemolytica affects ____, but not ____
cattle, not dogs
E. coli affects ____, but not ___
neonatal calves, but not adult cattle
Specific strains of E. coli produce ___, causing _____ dz
shiga toxin
Hamburger
____ has a capsule to avoid phagocytosis
Pastruella multocida
Pathogenic E. coli have pili to...
attach to mucosa and produce enterotoxin
Pathogen-
organism that causes dz
Infection-
establishment of pathogen in host
Obligate Pathogen-
non oppertunistic
ex. obligate pathogen:
Bacillus anthracis
ex. Primary Pathogen and it's secondary pathogen
Chlamydophila felis (conjunctiva in cats)
Staphylococcus
ex. Opportunistic Pathogen (2)
E. coli -> UTI or otitis externa
Staphylococcus w/ chlamydophilia felis in cats (also secondary pathogen)
ex. of exogenous pathogen
Bacillus anthracis (soil-> animal)
ex. of endogenous pathogen
Gingivitis in dogs from commensal
ex. of contagious dz's (2)
strangles in horses (streptococcus equi)
Pneumonic Plague in cats and humans (yersinia pestis)
Bordetella bronchiseptica enters via..
inhalation (dog -> cat -> pneumonia)
Salmonella enters via...
ingestion (feed -> cattle)
Lepto enters via...
Skin Abrasion, mucosa (water-> GI)
Brucellosis canis enters via...
Urogenital tract
Brucellosis enters via...
Placenta to fetus
E. Coli in claves enters via...
umbilicus
Horizontal transmission-
spread by contact, food, water
Vertical transmission-
Transmission from mother to offsrping during pregnancy
streptococcus equi is ___ specific
species
Brucella abortus is ___ specific
organ
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Author
HLW
ID
62281
Card Set
Bact: Pathogenesis Factors
Description
Pathogenesis Factors
Updated
2011-01-27T02:52:45Z
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