Shared Flashcard Set

Details

Gram positive cocci
Staphs, streps, micrococci, enterococci
22
Veterinary Medicine
Undergraduate 3
06/04/2012

Additional Veterinary Medicine Flashcards

 


 

Cards

Term
Staphylococci - main pattern of dz
Definition
localised lesions
-pyogenic skin infections
e.g. dermatitis, pyoderma, abscesses, impetigo (superficial/mild, furunculosis (deep/severe), botryomycosis
-systemic infections
septiceamia +/- deposition / localised damage
Term
Staphylococci - source
Definition
-animal and human skin / MM commensals (upper resp and upper GIT)
-also in environment worldwide
Term
Staphylcoccus hyicus - normal habitat
Definition
-pig skin commensal esp
-also cattle udder skin / milk
-poultry skin / nares
Term
Staphylcoccus hyicus - dz
Definition
-Greasy pig dz
-bovine mastitis
-dermatitis in goats, cattle horses
Term
Staphylcoccus hyicus - greasy pig dz
Definition
-exudative epidermitis in piglets 1-12weeks
-due to epidermolyic toxin
-may be acute or chronic
-inf. skin will slough so inf. animals should be separated
Term
Staphylcoccus hyicus - greasy pig dz sequence of events
Definition
facial wounds allow entry --> inflam.
-->wrinkled skin and polyarthritis (chronic)
-->scaly / peeling skin --> systemic inf. and poss death (acute)
Term
Staphylococcus pseudointermedius - normal habitat
Definition
-dog and cat skin / nasopharynx commensal
Term
Staphylococcus pseudointermedius - dz
Definition
-bovine mastitis
-dog and skin skin infections
-canine variety of infections
e.g. otitis externa, ocular inf., urinary tratc inf., pyometra, joint inf
Term
Staphlococcus aureus - main dz
Definition
-synovitis in poultry (bumble foot)
-tick (lamb) pyaemia
-mastitis
-botryomycosis
Term
Staphlococcus aureus - synovitis in poultry
Definition
-pyogranulomatous inf. lesion in joints
-acute mild - bumblefoot - cuts in feet where bact gain entry, results in swelling and inflam - bird can't walk well
-acute severe - artritis wing and leg joints) +/- septicaemia and poss. death
-chronic - osteoarthritis
Term
Staphlococcus aureus - tick (lamb) pyaemia - cause
Definition
-tick bite allow bact. entry
i.e. NOT tick-borne
-seasonal dz - spring when ticks active
Term
Staphlococcus aureus - tick (lamb) pyaemia - disease
Definition
Acute - abscesses +/-septicaemia
Chronic - deposition in vital organs/joints - can be severly crippled (growing quickly!)
Term
Staph. aureus masitis - spp
Definition
-in most spp
-most common cause of mastitis in lactating ewe
Term
Staph. aureus bovine masitis - disease
Definition
Acute gangrenous form - alpha-haemolysin damages bv. and causes necrosis
-inf. quarter becomes hard, blue and gangrenous
-toxaemia, w. high fever, death as toxins spill into blood
-chronic subclinical form is most common - economically significant due to decr. milk yield, high WBC count and potential passage to humans
Term
Staph aureus Botryomycosis - disease
Definition
-chronic infection of accidental / surgical wounds in many spp
-in pigs often udder
-most common in colts post-casration
Term
Staph aureus Botryomycosis - colts
Definition
-commensals on skin enter spermatic cord stump
-mass of abscesses form
-host walls off abscesses w. tough fibrous capsule
-if organism spreads systemically then rapidly fatal
Term
Staph aureus - alpha-haemolysin toxin
Definition
-a plama membrane porin i.e. cytocidal - highly potent
-affects WBC - lysosome disruption
-smooth muscle in bv walls - constriction / necrosis
-many cell types - necrosis / dermonecrosis
Term
Staph aureus - alpha-haemolysin lab test
Definition
-complete RBC lysis (narrow clear zone)
-neutralisation assay
Term
Staph aureus - beta-haemolysin toxin
Definition
partial RBC lysis - wide zone
-hot-cold haemolysis
Term
Staph aureus - tx
Definition
-R genes are common and widespread so bare w. antibiotics - check sensitivity
-Pus is protective - need quite hig levels of ABs
-lamb pyaemia - tick control
Term
Staph aureus - prevention
Definition
staphs are R to drying, phenolic compounds, 60C for 30mins, 20%NaCl
-sensitive to common disinfectants, aniline dyes
-vacc are available - staph hyicus for sows, staph aureus mastitis but acute only (whihc is less common)
Supporting users have an ad free experience!