The
results
serve
a
guide
to
physician
to
prescribe
a
drug.
An
agar
medium
such
as
Mueller
Hinton
medium
is
inoculated
with
the
organism
and
poured
to
the
plate.
Paper
discs
containing
known
concentrations
of
antibiotics
are
applied
to
the
surface,
and
the
plate
is
incubated. The
appearance
of
a
zone
of
inhibition
surrounding
the
disc
is
indicative
of
sensitivity.
By
comparing
the
diameter
of
the
zones
to
a
standard
table,
one
may
determine
if
the
test
organism
is
susceptible,
or
resistant
to
the
antibiotic.
If
the
organism
is
susceptible,
it
is
likely
to
be
killed
in
the
blood
stream
of
the
patient
if
that
concentration
of
the
drug
is
reached.
Resistance
indicates
that
the
antibiotic
will
not
be
effective
at
that
concentration
in
the
blood
stream.
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