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Role of Brevundimonas vesicularis in supporting the growth of Legionella in nutrient-poor environments.
[legionellosis]
In
1986
,
we
encountered
the
first
case
of
Legionella
micdadei
pneumonia
in
Japan
.
In
the
follow-up
study
to
determine
the
infection
route
of
L
.
micdadei
,
we
isolated
Brevundimonas
vesicularis
from
the
shower
hose
of
the
patient
�
s
home
.
This
motivated
us
to
explore
the
symbiosis
between
B
.
vesicularis
and
Legionella
in
this
study
.
B
.
vesicularis
type
strain
,
B
.
vesicularis
Kobe
strain
,
Legionella
pneumophila
serogroup
1
type
strain
,
and
L
.
micdadei
Kobe
strain
were
used
.
B
.
vesicularis
was
inoculated
into
0
.
01
M
phosphate
buffer
solution
containing
artificial
sand
,
and
varying
concentrations
of
glucose
at
0
.
1
%
,
0
.
01
%
,
and
0
.
001
%
.
Legionella
was
added
to
the
cultures
after
ten
days
of
incubation
,
and
Legionella
viable
counts
were
monitored
over
time
.
After
three
days
of
incubation
,
Legionella
counts
increased
approximately
twofold
in
flasks
containing
0
.
001
%
glucose
,
but
Legionella
counts
decreased
in
both
B
.
vesicularis
inoculated
and
non-inoculated
flasks
containing
higher
concentrations
of
glucose
.
The
counts
were
significantly
higher
in
flasks
inoculated
with
B
.
vesicularis
than
in
non-inoculated
flasks
throughout
the
experiments
.
Under
the
nutrient-
poor
conditions
,
the
presence
of
B
.
vesicularis
was
found
to
aid
a
further
increase
in
Legionella
counts
.
Further
research
is
necessary
to
understand
the
symbiotic
conditions
most
supporting
the
growth
of
L
.
micdadei
.
Diseases
Validation
Diseases presenting
"poor conditions"
symptom
legionellosis
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