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Bacteriology
Staphylococcus and Micrococcus
Staphylococcus epidermis
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Created by
Clare Njoroge
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Cards (31)
What are the characteristics of coagulase negative Staphylococcus?
Gram-positive
cocci in grape-like clusters
Non-hemolytic
on blood agar
Catalase
positive but
coagulase
negative
Do not ferment
mannitol
Resistant to
polymyxin B
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What is Staphylococcus epidermidis known for?
Normal flora
of the skin
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What does Staphylococcus epidermidis produce that helps it adhere to catheters?
Glacocalyx
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What infections can Staphylococcus epidermidis cause?
Endocarditis and
bacteremia
.
Sepsis in neonates and peritonitis in patients with renal failure-peritoneal dialysis.
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How is Staphylococcus epidermidis treated?
With
vancomycin
and
rifampin
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Which organism is discussed in this section?
Staphylococcus epidermidis
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What color does staphylococcus epidermidis stain in a gram stain?
Purple
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What shape are staphylococci bacteria?
Circular
or
cocci-shaped
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How do staphylococci bacteria typically arrange themselves?
In
clusters
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What does the background color in the video represent?
Gram-positive
characteristic
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What does the flower vase symbolize in the image?
Normal skin flora
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What is the significance of the bison in the image?
Symbol for
novobiosin
test
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What does it mean if staphylococcus epidermidis is novobiosin sensitive?
It is
inhibited
by novobiosin
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What does a zone of clearing around a novobiosin disk indicate?
Organism is
novobiosin sensitive
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What does the blood on the wall represent?
Frequent contamination of
blood cultures
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What does the presence of the cat indicate in the image?
Catalase positive
organism
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What does the catalase test demonstrate?
Presence of
bubbles
indicates catalase positive
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What does the cat urinating symbolize?
Urease
positive organisms
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What does urease break down urea into?
Carbon dioxide
and
ammonia
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What happens to the pH of the solution if the organism is urease positive?
It
increases
, turning the solution
pink
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What does the biofilm on the pipe represent?
Adherent biofilm
produced by staph epidermidis
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What is the function of the biofilm produced by staph epidermidis?
Barrier to
antibiotics
and
immune system
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What does the stick in the bison symbolize?
Infection
of foreign bodies
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What does staph epidermidis infect?
Prosthetic
devices and
IV catheters
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What does the car in the parking lot represent?
Endocarditis
in
prosthetic
heart valve patients
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What is the significance of vancomycin in relation to staph epidermidis?
It is
effective
against staph epidermidis
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What condition is indicated by a fever and cardiac murmur in a patient with a prosthetic valve?
Prosthetic valve endocarditis
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What does the growth of coagulase negative staphylococci in blood cultures suggest?
Presence of
staphylococcus epidermidis
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Why is staphylococcus epidermidis considered coagulase negative?
It
does not
produce coagulase
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What are the key characteristics of staphylococcus epidermidis?
Gram-positive
Cocci-shaped
Forms
clusters
Part of normal skin flora
Novobiosin
sensitive
Catalase
positive
Urease
positive
Produces
adherent biofilm
Coagulase
negative
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What are the clinical implications of staphylococcus epidermidis infections?
Frequent contamination of
blood cultures
Infection of
prosthetic devices
Endocarditis
in patients with prosthetic heart valves
Resistance to
antibiotics
due to
biofilm
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