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Second Year > Family microccace > Flashcards

Family microccace Flashcards

1
Q

Family Microccacea contains

A

Genus
Staphylococcus
Micrococcus
Planococcus

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2
Q

Genus Staphylococcus contains

A

S.aureus
S.intermedius
S.hyicus

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3
Q

Key points Staphyloccocus

A 
Gram+
Cocci in clusters “bunches of grapes”
Non enriched media
No growth on MacConkey
Moderately sized white/golden colonies
S.aureus+S.pseudintermedius=double haemolysis 
Facultative anaerobes
Non-motile
Catalase +
Pyogenic infections
Commensals on mucous membranes 
Stable in environment 
Coagulase+
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4
Q

Staphylococcus aureus

A 
Coagulase positive
Double haemolysis
Endogenous or exogenous
Mastitis in ruminants
Suppurative conditions in most species
In rabbits abscesses, mastitis, pododermatitis, septicemia
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5
Q

Staphylococcus pseudintermedius

A

Coagulase positive
Double haemolysis
Cause pyoderma, endometritis, otitis in dogs
Pyrogenic infections in cats

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6
Q

Staphylococcus hyicus

A

Coagulase positive
No haemolysis
Cause exudative epidermitis in pigs “greasy pig”

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7
Q

Pathogenesis/pathogenicity in Staphylococcus spp.

A

Cell wall proteins facilitating attachment
Capsular content interfere with opsonization
Coagulase (fibrinogen to fibrin)
Catalase (survival within phagocytes)
Exfoliating toxins (protease=lesions)
Toxic shock syndrome toxins (tissue damage)
Biofilm
Enterotoxin

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8
Q

Family Streptococcaceae contains

A

Genus
Streptococcus
Enterococcus
Peptostreptococcus

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9
Q

Genus Streptococcus species

A 
S.equi
S.suis
S.agalactiae
S.dysgalacticae
S.pneumoniae
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10
Q

Key points Streptococcus

A 
Gram +
Cocci in chains
Fastidious, require enriched media
Small haemolytic translucent colonies
Facultative anaerobes, usually non-motile
Susceptible to desiccation
Pyrogenic infections (not S.suidae)
Abscesses, septicaemia, suppurative lesions
Commensals URT and LUT
Only enterococcus grow on MacConkey agar
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11
Q

S.agalacticae

A 
Tend to form chains
Catalase negative
Facultative anaerobe 
Blood agar
CAMP-positive (arrow head w S.aureus)
Produce haemolysis on blood agar
Mastitis in ruminants
Zoonotic
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12
Q

S.dysgalactiae

A 
Blood agar, haemolysis
Facultative anaerobes
Catalase negative
CAMP negative
Mastitis in cows
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13
Q

S.equi

A 
S.equi subsp. equi
Blood agar, haemolysis
Catalase negative
CAMP negative
Strangles in horses
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14
Q

S.suis

A 
Blood agar,  haemolysis
Not pyogenic 
Catalase negative
CAMP negative
Sempticaemia, meningitis mm in pigs
Zoonotic
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