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Rapid increase of scrub typhus: an epidemiology and spatial-temporal cluster analysis in Guangzhou City, Southern China, 2006-2012.
[scrub typhus]
Scrub
typhus
has
been
increasingly
reported
in
Southern
China
,
and
public
health
authorities
are
concerned
about
its
increased
incidence
.
Additionally
,
little
evidence
is
available
on
the
epidemiology
of
scrub
typhus
in
Southern
China
.
This
study
aims
to
analyze
the
epidemiological
and
geographic
features
of
ST
in
Guangzhou
City
,
Southern
China
,
to
guide
the
future
prevention
efforts
.
Scrub
typhus
surveillance
data
in
Guangzhou
City
during
2006
-
2012
were
obtained
from
the
Chinese
National
Communicable
Disease
Surveillance
Network
.
We
first
conducted
a
descriptive
analysis
to
analyze
the
epidemiological
features
of
scrub
typhus
.
Then
we
used
space-time
scan
statistic
based
on
a
discrete
Poisson
model
to
detect
and
evaluate
high
-risk
spatial-
temporal
clusters
of
scrub
typhus
.
There
were
4
,
001
cases
of
scrub
typhus
in
Guangzhou
City
during
the
study
period
.
The
incidence
of
scrub
typhus
increased
from
3
.
29
per
100
,
000
in
2006
to
9
.
85
per
100
,
000
in
2012
.
A
summer
peak
was
observed
in
June
and
July
with
a
second
peak
in
September
and
October
except
year
2009
and
2011
.
The
majority
of
the
cases
(
71
.
4
%
)
were
among
persons
aged
≥
40
years
,
and
female
incidence
was
higher
than
male
incidence
in
persons
≥
50
years
.
In
the
space-time
analysis
,
high
-risk
clusters
were
concentrated
in
rural
areas
in
Guangzhou
City
.
Over
the
past
7
years
,
Haizhu
District
,
an
urban
area
,
was
found
to
be
a
high
-risk
cluster
for
the
first
time
in
2012
.
The
resurgence
of
scrub
typhus
epidemics
in
Guangzhou
population
in
2012
necessitates
more
effective
measures
for
minimizing
future
epidemics
.
Consideration
of
high
-risk
population
and
historical
spatial-
temporal
clusters
may
help
prevent
scrub
typhus
.
The
risk
of
scrub
typhus
in
urban
areas
should
not
be
neglected
and
needs
more
attention
from
public
health
authorities
.
Diseases
Validation
Diseases presenting
"second peak"
symptom
congenital toxoplasmosis
scrub typhus
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