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Community outbreak of legionellosis and an environmental investigation into a community water system.
[legionellosis]
SUMMARY
During
two
legionellosis
outbreak
investigations
,
one
at
a
geriatric
centre
and
the
other
in
high
-rise
housing
for
seniors
,
it
was
observed
that
additional
cases
of
legionellosis
occurred
in
nearby
smaller
residential
settings
.
This
apparent
geographical
cluster
of
legionellosis
occurred
in
the
same
general
area
of
a
community
water
storage
tank
.
No
potential
airborne
sources
in
or
near
the
area
could
be
identified
,
but
a
community
water
system
storage
tank
that
was
centrally
located
among
case
residences
spurred
an
investigation
of
water-quality
factors
in
the
identified
investigation
area
.
Conditions
conducive
for
Legionella
growth
,
particularly
low
chlorine
residuals
,
were
found
.
The
rate
of
legionellosis
among
residents
aged
⩾
50
years
in
the
investigation
areas
(
61
·
0
and
64
·
1
/
100
000
)
was
eight
times
higher
than
in
the
rest
of
the
service
area
(
9
·
0
/
100
000
)
and
almost
20
times
higher
than
the
statewide
annual
average
incidence
rate
(
3
·
2
/
100
000
)
.
A
water
mains
flushing
programme
in
the
area
was
launched
by
the
water
utility
,
and
water
samples
taken
before
and
during
flushing
found
L
.
pneumophila
.
