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Environmental surveillance and molecular investigation of Legionella spp. in Apulia, in the years 2008-2011.
[legionellosis]
Legionella
spp
.
is
considered
an
emerging
microorganism
involved
in
aquatic
environments
contamination
and
cause
of
Legionnaires
'
disease
.
The
aims
of
the
study
are
to
evaluate
the
level
of
contamination
of
Legionella
spp
.
in
the
water
system
of
the
largest
Hospital
of
Apulia
region
during
a
4
-
year
surveillance
and
to
establish
,
by
molecular
method
,
the
presence
of
a
predominant
genotype
of
L
.
pn
.
sg
1
.
The
results
showed
that
Legionella
spp
.
was
present
in
36
%
of
water
samples
with
Legionella
pneumophila
serogroup
1
(
L
.
pn
.
sg
1
)
the
most
prevalent
species
and
serogroup
and
the
wards
most
contaminated
are
the
high
risk
units
.
In
addition
,
despite
four
main
clones
of
L
.
pn
.
sg
1
were
identified
,
a
predominant
genotype
existed
.
In
conclusion
the
study
demonstrates
the
necessity
for
periodic
evaluation
on
hospitals
water
system
to
assess
the
potential
contamination
of
Legionella
spp
.
,
performing
decontamination
in
the
presence
of
bacterial
contamination
,
even
low
,
in
particular
in
high
risk
wards
.
Moreover
,
the
switching
of
the
disinfection
methods
may
be
suggested
in
order
to
prevent
resistance
phenomenon
by
some
L
.
pn
.
sg
1
clones
.
