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Bacteriology
Staphylococcus and Micrococcus
Micrococcus
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Created by
Clare Njoroge
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Cards (26)
What are the characteristics of Micrococcus?
Gram-positive
cocci forming pairs and tetrads
Catalase
positive
and
coagulase-negative
Transient flora
on exposed skin
Associated with
pulmonary infections
and
bacteremia
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What infections are Micrococcus associated with?
Pulmonary infections and
septic shock
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What is the arrangement of Micrococcus bacteria?
Forming
pairs
and
tetrads
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What is the catalase and coagulase status of Micrococcus?
Catalase
positive
and
coagulase-negative
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Where is Micrococcus commonly found?
On
exposed
skin of face, arms, and hands
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What serious conditions can Micrococcus cause?
Septic
shock and
endocarditis
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What is the genus of the bacteria being discussed?
Micrococcus
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What type of bacteria is Micrococcus classified as?
Gram-positive
spherical
bacteria
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Where can Micrococcus typically be found?
Soil
, dust, and
human skin
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What is the domain classification of Micrococcus?
Bacteria
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How do Micrococcus bacteria typically arrange themselves?
In groups of
four
(
tetrads
)
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What is the typical size range of Micrococcus bacteria?
0.5
to
3.5
micrometers
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What type of oxygen requirement do Micrococcus bacteria have?
Obligate aerobes
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What does it mean that Micrococcus is catalase positive?
It
produces
the enzyme catalase
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What does the enzyme catalase do?
Breaks down
hydrogen peroxide
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What does it mean that Micrococcus is oxidase positive?
It
produces
the enzyme oxidase
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What is notable about the guanine and cytosine content in Micrococcus?
Its genome is
rich
in guanine and cytosine
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What is a common species of Micrococcus that forms yellow colonies?
Micrococcus luteus
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Where is Micrococcus luteus commonly found?
In
milk
and
dairy
products
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What color colonies does Micrococcus roseus produce?
Pink
colonies
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Where is Micrococcus roseus commonly found?
In
dust
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What is the clinical relevance of Micrococcus?
Generally
nonpathogenic
, can cause
infections
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In which individuals can Micrococcus cause infections?
Immunosuppressed
individuals
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How are Micrococcus generally regarded in clinical specimens?
As
contaminants
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What are the characteristics of Micrococcus bacteria?
Gram-positive
Spherical
shape
Arranged in
tetrads
Obligate aerobes
Catalase
positive
Oxidase
positive
Rich in
guanine
and cytosine
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What is the summary of Micrococcus bacteria's clinical relevance?
Generally
nonpathogenic
Can cause infections in
immunosuppressed
individuals
Often regarded as contaminants in
clinical specimens
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