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Dual infections with different Legionella strains.
[legionellosis]
In
2010
a
case
of
a
dual
infection
with
Legionella
pneumophila
serogroup
(
sg
)
1
and
sg
3
was
identified
by
culture
of
a
blood
sample
collected
from
a
female
Austrian
patient
with
septic
pneumonia
.
Subsequently
all
35
European
National
Legionella
Reference
Laboratories
were
interviewed
regarding
the
frequency
of
dual
infections
in
legionellosis
.
The
Reference
Laboratories
in
Denmark
,
the
UK
and
Germany
reported
the
detection
of
another
14
cases
of
dual
infections
with
different
Legionella
strains
between
2002
and
2012
.
Among
the
15
cases
,
there
were
four
cases
with
different
Legionella
species
,
six
cases
with
different
L
.
pneumophila
serogroups
,
and
five
cases
of
dual
infections
with
L
.
pneumophila
sg
1
with
different
MAb-types
.
The
median
age
of
the
15
cases
was
56
years
and
the
male
to
female
ratio
1
:
1
.
14
.
Six
of
the
15
patients
were
receiving
immunosuppressive
treatment
following
organ
transplantation
(
n
=
3
)
or
for
underlying
haematological
and
solid
malignancies
(
n
=
3
)
.
Five
of
the
15
cases
died
within
30
days
following
diagnosis
.
Efforts
to
detect
dual
infections
with
different
Legionella
strains
will
improve
our
ability
to
correctly
elucidate
the
causative
sources
of
infection
and
enhance
our
understanding
of
the
epidemiology
of
Legionella
infections
.
