west nile virus in tarrant county, texas...west nile virus 2012 data tarrant county public health...
TRANSCRIPT
![Page 1: West Nile Virus in Tarrant County, Texas...West Nile Virus 2012 Data Tarrant County Public Health North Texas Regional Laboratory 9 WNV Mosquito Pool Testing 2012 WNV Trends 0 10 20](https://reader034.vdocuments.mx/reader034/viewer/2022052613/6054a178f217de08161eb0b8/html5/thumbnails/1.jpg)
Tarrant County Public Health North Texas Regional Laboratory
West Nile Virus in Tarrant County, Texas
Guy C. Dixon, Ph.D.
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Tarrant County Public Health North Texas Regional Laboratory
Tarrant County WNV Geographical Information
2003 - 2012
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Tarrant County Public Health North Texas Regional Laboratory
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Tarrant County WNV Geography
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Tarrant County Public Health North Texas Regional Laboratory
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Tarrant County WNV Geography
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Tarrant County Public Health North Texas Regional Laboratory
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Tarrant County WNV Geography
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Tarrant County Public Health North Texas Regional Laboratory
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Tarrant County WNV Geography
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Tarrant County Public Health North Texas Regional Laboratory
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Tarrant County WNV Geography
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Tarrant County Public Health North Texas Regional Laboratory
West Nile Virus 2012 Data
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Tarrant County Public Health North Texas Regional Laboratory
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WNV Mosquito Pool Testing 2012 WNV Trends
0
10
20
30
40
50
60
70
6/4/2012
6/11/2012
6/18/2012
6/25/2012
7/2/2012
7/9/2012
7/16/2012
7/23/2012
7/30/2012
8/6/2012
8/13/2012
8/20/2012
8/27/2012
9/3/2012
9/10/2012
9/17/2012
9/24/2012
10/1/20
12
10/8/20
12
10/15/2012
10/22/2012
10/29/2012
Date
Num
bers
Submissions
Positives
Positive Ratio (%)
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Tarrant County Public Health North Texas Regional Laboratory
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Number of WNV Cases by Onset of Illness, Tarrant County, 2012
0
2
4
6
8
10
12
14
Nu
mb
er
of
WN
V I
lln
essn
es
Onset of Illness Date
West Nile Neuroinvasive Disease
West Nile Fever
Total Number of Cases = 275
Data source: Tarrant County Public Health
Average time
from when a
person
becomes
ill until the
case is
reported
to TCPH is
currently
15.6 days.
Therefore,
illnesses that
began during
this time may
not yet be
reported.
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Tarrant County Public Health North Texas Regional Laboratory
Tarrant County WNV Trends
2003 – 2012
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Tarrant County Public Health North Texas Regional Laboratory
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Tarrant County WNV Trends
5 225
2353
22 14 320 2
275
1 0 0 0 7 0 0 3 0 011
0
100
200
300
2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012
Year
WNV Human Cases
Deaths Total Cases
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Tarrant County Public Health North Texas Regional Laboratory
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Tarrant County WNV Trends Mosquito Submissions 2003-2012
636
553
483
338
88
647
137
378
115
227223
99
00
307
2839
61
21
0
100
200
300
400
500
600
700
2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013
Year
# of
Sub
mitt
ed a
nd P
ositi
ve M
osqu
ito P
ools
Submissions
Positives
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Tarrant County Public Health North Texas Regional Laboratory
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Tarrant County WNV Trends
May
June
July
Aug
ust
Sep
tem
ber
Oct
ober
Nov
embe
r
2012
2010
2008
2006
2004
0
5
10
15
20
25
30
35
40
45
50
# of Positives
Month
Year
Monthly WNV Positives 2003-2012
2012
2011
2010
2009
2008
2007
2006
2005
2004
2003
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Tarrant County Public Health North Texas Regional Laboratory
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Tarrant County WNV Trends WNV Positive Pools by Month
(2003 and 2003-2012 Average)
11%
30%31%
42%
5%
0%
5%
0%2%
8%
14%
18%
0%
5%
10%
15%
20%
25%
30%
35%
40%
45%
May June July August September October November
Month
Rat
io o
f WN
V P
ositi
ve P
ools
2003
Average 2003-2012
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Tarrant County Public Health North Texas Regional Laboratory
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Tarrant County WNV Trends WNV Positive Pools by Month
(2004 and 2003-2012 Average)
0.6%
8%4%
9%
1%0%
5%
0%2%
8%
14%
18%
0%
5%
10%
15%
20%
25%
30%
35%
40%
45%
May June July August September October November
Month
Rat
io o
f WN
V P
ositi
ve P
ools
2004
Average 2003-2012
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Tarrant County Public Health North Texas Regional Laboratory
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Tarrant County WNV Trends WNV Positive Pools by Month
(2005 and 2003-2012 Average)
2.5%
11%
25%
18%
3.2%0%
5%
0%2%
8%
14%
18%
0%
5%
10%
15%
20%
25%
30%
35%
40%
45%
May June July August September October November
Month
Rat
io o
f WN
V P
ositi
ve P
ools
2005
Average 2003-2012
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Tarrant County Public Health North Texas Regional Laboratory
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Tarrant County WNV Trends WNV Positive Pools by Month
(2006 and 2003-2012 Average)
0%
1.8%
1.5%
30%
6%8.8%
0%5%
0%1.7%
8%
14%
18%
0%
5%
10%
15%
20%
25%
30%
35%
40%
45%
May June July August September October November
Month
Rat
io o
f WN
V P
ositi
ve P
ools
2006
Average 2003-2012
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Tarrant County Public Health North Texas Regional Laboratory
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Tarrant County WNV Trends WNV Positive Pools by Month
(2007 and 2003-2012 Average)
0%
7%5%
19%
1%0%
5%
0%1.7%
8%
14%
18%
0%
5%
10%
15%
20%
25%
30%
35%
40%
45%
May June July August September October November
Month
Rat
io o
f WN
V P
ositi
ve P
ools
2007
Average 2003-2012
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Tarrant County Public Health North Texas Regional Laboratory
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Tarrant County WNV Trends WNV Positive Pools by Month
(2008 and 2003-2012 Average)
0%
6%3%
7%
0%0%
5%
0%1.7%
8%
14%
18%
0%
5%
10%
15%
20%
25%
30%
35%
40%
45%
May June July August September October November
Month
Rat
io o
f WN
V P
ositi
ve P
ools
2008
Average 2003-2012
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Tarrant County Public Health North Texas Regional Laboratory
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Tarrant County WNV Trends WNV Positive Pools by Month
(2009 and 2003-2012 Average)
0%
12%
20%
25%
4%0%
5%
0%1.7%
8%
14%
18%
0%
5%
10%
15%
20%
25%
30%
35%
40%
45%
May June July August September October November
Month
Rat
io o
f WN
V P
ositi
ve P
ools
2009
Average 2003-2012
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Tarrant County Public Health North Texas Regional Laboratory
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Tarrant County WNV Trends WNV Positive Pools by Month
(2010 and 2003-2012 Average)
0%0%0% 0%0%0%
5%
0%1.7%
8%
14%
18%
0%
5%
10%
15%
20%
25%
30%
35%
40%
45%
May June July August September October November
Month
Rat
io o
f WN
V P
ositi
ve P
ools
2010
Average 2003-2012
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Tarrant County Public Health North Texas Regional Laboratory
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Tarrant County WNV Trends WNV Positive Pools by Month
(2011 and 2003-2012 Average)
0%0%0%0%0%
5%
0%1.7%
8%
14%
18%
0%
5%
10%
15%
20%
25%
30%
35%
40%
45%
May June July August September October November
Month
Rat
io o
f WN
V P
ositi
ve P
ools
2011
Average 2003-2012
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Tarrant County Public Health North Texas Regional Laboratory
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Tarrant County WNV Trends WNV Positive Pools by Month
(2012 and 2003-2012 Average)
1.2%2.5%
44%
16%
28%
0%
5%
0%1.7%
8%
14%
18%
0%
5%
10%
15%
20%
25%
30%
35%
40%
45%
May June July August September October November
Month
Rat
io o
f WN
V P
ositi
ve P
ools
2012
Average 2003-2012
October data as of 10/26/2012
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Tarrant County Public Health North Texas Regional Laboratory
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Tarrant County WNV Trends WNV Positive Pools by Month
(2003, 2006, 2012, and 2003-2012 Average)
11%
0% 0%
16%
30%31%
42%
6%9%
30%
2%
44%
28%
1%
2%0%
5%0%
2%
8%
14%
18%
0%
5%
10%
15%
20%
25%
30%
35%
40%
45%
50%
May June July August September October November
Month
Rat
io o
f WN
V Po
sitiv
e Po
ols
2003
2006
2012
Average 2003-2012
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Tarrant County Public Health North Texas Regional Laboratory
26
Tarrant County WNV Trends Temperature (Mar-May)
67.3
68.6
66.2
70.9
67.1 67.166.2
67.1
69.3
71.6
62
64
66
68
70
72
74
2003 2004 2005 2006 2007 2008 2009 2010 2011 2012
Year
Deg
ree F
are
nh
eit
Spring Ave Temp Ave (1948-2012)
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Tarrant County Public Health North Texas Regional Laboratory
27
Conclusions
• A cyclical pattern of increased mosquito to human WNV transmission is emerging
• Weather conditions such as abnormally high spring temperatures may contribute to increased WNV transmission
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Tarrant County Public Health North Texas Regional Laboratory
28
Future Opportunities
• Develop thresholds for response activities to mitigate WNV transmission to humans
• Research using climatological and additional vector/host information to enhance predictive models for WNV mosquito to human transmission
• Develop efficient and effective surveillance practices for detecting WNV in the environment
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Tarrant County Public Health North Texas Regional Laboratory
29
Acknowledgements
• Michelle Markham, Environmental Health - GIS
• Kaylene Thomason, Environmental Health • Dr. Anita Kurian, Epidemiology • Dr. Rune-Par Nilsson, BREA Lab Section
Supervisor