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Mycobacteria in Finnish cooling tower waters.
[legionellosis]
Evaporative
cooling
towers
are
water
systems
used
in
,
e
.
g
.
,
industry
and
telecommunication
to
remove
excess
heat
by
evaporation
of
water
.
Temperatures
of
cooling
waters
are
usually
optimal
for
mesophilic
microbial
growth
and
cooling
towers
may
liberate
massive
amounts
of
bacterial
aerosols
.
Outbreaks
of
legionellosis
associated
with
cooling
towers
have
been
known
since
the
1980
's
,
but
occurrences
of
other
potentially
pathogenic
bacteria
in
cooling
waters
are
mostly
unknown
.
We
examined
the
occurrence
of
mycobacteria
,
which
are
common
bacteria
in
different
water
systems
and
may
cause
pulmonary
and
other
soft
tissue
infections
,
in
cooling
waters
containing
different
numbers
of
legionellae
.
Mycobacteria
were
isolated
from
all
twelve
cooling
systems
and
from
92
%
of
the
24
samples
studied
.
Their
numbers
in
the
positive
samples
varied
from
10
to
7
.
3
×
10
(
4
)
cfu
/
L
.
The
isolated
species
included
M
.
chelonae
/
abscessus
,
M
.
fortuitum
,
M
.
mucogenicum
,
M
.
peregrinum
,
M
.
intracellulare
,
M
.
lentiflavum
,
M
.
avium
/
nebraskense
/
scrofulaceum
and
many
non-pathogenic
species
.
The
numbers
of
mycobacteria
correlated
negatively
with
the
numbers
of
legionellae
and
the
concentration
of
copper
.
The
results
show
that
cooling
towers
are
suitable
environments
for
potentially
pathogenic
mycobacteria
.
Further
transmission
of
mycobacteria
from
the
towers
to
the
environment
needs
examination
.
Diseases
Validation
Diseases presenting
"other soft tissue infections"
symptom
legionellosis
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