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Legionellosis in Military Health System beneficiaries, 1998-2013.
[legionellosis]
Legionellosis
is
an
infection
caused
by
exposure
to
mist
or
vapor
contaminated
with
Legionella
bacteria
.
During
the
16
-
year
surveillance
period
,
73
cases
of
legionellosis
were
identified
in
active
component
service
members
;
37
were
identified
among
the
reserve
component
;
and
1
,
044
were
identified
among
all
other
beneficiaries
of
the
Military
Health
System
(
MHS
)
.
Of
the
total
1
,
154
cases
of
legionellosis
,
11
percent
(
n
=
126
)
were
confirmed
cases
(
i
.
e
.
,
reportable
medical
events
)
;
52
percent
(
n
=
599
)
were
probable
cases
(
i
.
e
.
,
hospitalizations
)
;
and
37
percent
(
n
=
429
)
were
suspected
cases
(
i
.
e
.
,
ambulatory
visits
)
.
Most
of
the
cases
(
59
%
)
were
identified
in
individuals
aged
60
years
and
older
.
The
annual
number
of
cases
increased
during
the
surveillance
period
and
demonstrated
a
seasonal
trend
with
more
cases
occurring
in
the
summer
and
early
fall
.
Recent
trends
in
the
incidence
of
legionellosis
among
MHS
beneficiaries
and
civilian
populations
in
the
United
States
highlight
the
importance
of
correctly
identifying
the
etiologic
agents
of
bacterial
pneumonia
and
submitting
reports
of
cases
of
legionellosis
through
the
appropriate
reporting
system
.
