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Surveillance of Legionella species in hospital water systems: the significance of detection method for environmental surveillance data.
[legionellosis]
Monitoring
of
hospital
water
systems
to
prevent
and
control
nosocomial
legionellosis
is
important
from
a
public
health
perspective
.
This
study
was
conducted
to
survey
the
prevalence
of
Legionella
contamination
of
hospital
waters
.
A
total
of
44
water
samples
from
the
hot-water
system
of
11
hospitals
were
tested
for
Legionella
by
a
culture
method
and
a
nested
polymerase
chain
reaction
(
PCR
)
assay
with
Legionella-
specific
primers
to
identify
the
more
sensitive
method
.
Some
physicochemical
parameters
and
heterotrophic
plate
counts
of
water
samples
for
possible
association
with
Legionella
contamination
were
also
determined
.
The
contamination
rate
of
hospitals
in
our
study
varied
between
64
%
(
eight
of
11
)
-
100
%
based
on
culture
method
and
nested
PCR
,
respectively
.
Of
the
44
water
samples
examined
,
23
%
were
positive
for
Legionella
spp
.
by
the
culture
method
,
while
the
nested
PCR
assay
using
the
primers
LEG
448
-
JRP
revealed
66
%
of
the
water
samples
being
positive
.
Given
the
importance
of
monitoring
hospital
water
systems
for
the
presence
of
Legionella
spp
.
,
the
present
PCR
assay
proved
highly
applicable
for
practical
and
sensitive
surveillance
of
Legionella
in
such
water
systems
.
In
addition
,
rapid
monitoring
of
Legionella
contamination
could
eliminate
the
potential
exposure
of
high
-risk
patients
through
effective
control
measures
.