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Staphylococcus aureus
English Wikipedia - The Free Encyclopedia
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Staphylococcus aureus
Staphylococcus aureus
is a
gram-positive
coccal
bacterium
that is a member of the
Firmicutes
, and is frequently found in the
nose
,
respiratory tract
, and on the
skin
. It is often positive for
catalase
and
nitrate reduction
. Although
S. aureus
is not always
pathogenic
, it is a common cause of
skin infections
such as
abscesses
, respiratory infections such as
sinusitis
, and
food poisoning
. Pathogenic strains often promote
infections
by producing potent
protein
toxins
, and expressing cell-surface proteins that
bind and inactivate antibodies
. The emergence of
antibiotic-resistant
strains of
S. aureus
such as
MRSA
is a worldwide problem in
clinical medicine
.
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