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![Page 1: West Nile Virus Surveillance and Response U.S. National and Michigan 2002 Michigan Department of Agriculture Animal Industry Division Steven Halstead,](https://reader033.fdocuments.net/reader033/viewer/2022051316/56649f495503460f94c6b68d/html5/thumbnails/1.jpg)
West Nile Virus Surveillance and Response
U.S. National and Michigan2002
Michigan Department of AgricultureAnimal Industry Division
Steven Halstead, D.V.M., M.S.
![Page 2: West Nile Virus Surveillance and Response U.S. National and Michigan 2002 Michigan Department of Agriculture Animal Industry Division Steven Halstead,](https://reader033.fdocuments.net/reader033/viewer/2022051316/56649f495503460f94c6b68d/html5/thumbnails/2.jpg)
Acknowledging…
Kathryn Herbst, MSU CVM Class of 2004
Dr. Jon Patterson, MSU DCPAHDr. Roger Maes, MSU DCPAH
VirologyDr. Judy Marteniuk, MSU CVM LACS
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WNV Transmission Cycle
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WNV and Animals
Mosquitoes Birds
wild domestic
HorsesHumansOther
animals?
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From: www.thehorse.com
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National Equine WNV Cases
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Equine WNV Clinical Disease
Listlessness (Headache, flu-like) Fever Skin twitching Muscle fasciculations Stumbling Incoordination Weakness of limbs Ataxia Partial paralysis Possible death
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Equine WNV Facial Paralysis
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Equine WNV Treatment & Prognosis
Majority of cases: mild or non-apparent
Small % get sick > 65% affected horses
recover to normal function when treated.
If recumbent, guarded prognosis
No specific treatment – support (IV fluids/NG tube feeding; control fever; safe, quiet housing.)
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Positive Avian W N V Counties 2002Last Updated 11/1/02
K ew eenaw
B araga
4
Iron
1
H oughton
O ntonagon
1
G ogebic
2
M arquette
2
D ickinson
1
M enom inee
4
A lger
1D elta
1
Schoolcraft
2
Luce
1C hippew a
7 M ackinac
1
Em m et
2
A lpena
1
C heboygen
1 Presque Isle
2
O tsego
2
C harlevoix
3A ntrim
3Leelanau
3
M ontm orency
1
K alkaskaC raw ford
3O scoda
1A lcona
1B enzie
6G rand
Traverse
3R oscom m on
2M issaukee
2
W exford
1M anistee
3
O sceola
1LakeM ason
3
Iosco
4O gem aw
2C lare
2 G ladw in
4
Isabella
4
M ecosta
4N ew aygo
1
O ceana
2
A renac
2
M idland
7
B ay
9
H uron
2
M uskegon
4M ontcalm
4
Sanilac
5Tuscola
3Saginaw
27G ratiot
3K ent
12 Ionia
2C linton
1 Shiaw assee
5
G enesee
6
Lapeer
6 St. C lair
5
Eaton
9O akland
7
M acom b
20B arry
4A llegan
5
O ttaw a
1
Ingham
26Livingston
4Van B uren
5 K alam azoo
9
C alhoun
3Jackson
4 W ashtenaw
7
W ayne
6
St. Joseph
2 B ranch
1H illsdale
2Lenaw ee
3M onroe
10C ass
4B errien
7
= Counties w ith testing activity negative for W est N ile V irus (num ber of b irds tested) = Counties w ith a positive W NV bird (num ber of b irds tested before the positive)
Note: Testing of b irds stops after the first positive per county is confirm ed. Testing of birds endsNovem ber 1, 2002
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Positive Hum an W NV Counties 2002 Last Updated 2/18/03
Kew eenaw
Baraga
Iron
Houghton
O ntonagon
G ogebic
M arquette
D ickinson
M enom inee
Alger
Delta
Schoolcraft
Luce
Chippew a
M ackinac
Em m et
1
Alpena
Cheboygen Presque Isle
O tsego
1
Charlevoix
Antrim
Leelanau
M ontm orency
Kalkaska
Craw ford
O scoda
Alcona
Benzie
G rand Traverse
Roscom m on M issaukee
W exford M anistee
O sceola
Lake
M ason
Iosco O gem aw
C lare G ladw in
Isabella
M ecosta
New aygo
2
O ceana
Arenac
1
M idland
Bay
1
Huron
M uskegon
1 M ontcalm
Sanilac
1 Tuscola
Saginaw
2 G ratiot
Kent
57 Ionia
1 Clinton
Shiaw assee
G enesee
1
Lapeer
1 St. Clair
1
Eaton
2 O akland
184
M acom b
103 Barry
1prob. Allegan
1 prob.
O ttaw a
10
Ingham
7 Livingston
Van Buren
3 Kalam azoo
3
Calhoun
Jackson W ashtenaw
W ayne
187
St. Joseph Branch
H illsdale
Lenaw ee
2 M onroe
Cass
3 Berrien
= 24 Counties w ith a confirm ed positive W NV hum an cases (total num ber of confirm ed and probable positive cases). 577 total cases, 51 fatalities (Kent Co. = 4, Lenaw ee Co. = 1, M acom b Co. = 6, New aygo Co. = 1, O akland Co. = 20, O ttaw a Co. = 3, St. C lair Co. = 1, and W ayne Co. = 15) .
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Positive Equine W NV Counties 2002 Last Updated 5 Feb 2003
Kew eenaw
Baraga
Iron
Houghton
1
O ntonagon
1
G ogebic
M arquette
D ickinson
M enom inee
Alger
Delta
Schoolcraft
Luce
Chippew a
M ackinac
1
Em m et
2
Alpena
Cheboygen Presque Isle
O tsego
Charlevoix
Antrim
Leelanau
M ontm orency
Kalkaska
Craw ford
O scoda
Alcona
Benzie
G rand Traverse
Roscom m on M issaukee
1
W exford M anistee
O sceola
Lake
1 M ason
2
Iosco O gem aw
1 Clare
2 G ladw in
Isabella
4
M ecosta
2 New aygo
13
O ceana
Arenac
M idland
Bay
5
Huron
5
M uskegon
3 M ontcalm
4
Sanilac
3 Tuscola
8 Saginaw
1 G ratiot
4 Kent
28 Ionia
7 Clinton
9 Shiaw assee
2
G enesee
5
Lapeer
6 St. Clair
9
Eaton
9 O akland
10
M acom b
3 Barry
7 Allegan
40
O ttaw a
27
Ingham
10 Livingston
2 Van Buren
11 Kalam azoo
15
Calhoun
6 Jackson
8 W ashtenaw
6
W ayne
7
St. Joseph
7 Branch
5 Hillsdale
6 Lenaw ee
6 M onroe
8 Cass
7 Berrien
4
= Counties with a positive W NV horse or other equine species (num ber of po sitive cases) Please Note: Locations have not been verified for all of the equine cases and therefore 7 cases are not show n on the m ap. The total num ber of positive cases is 341.
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Date of Onsetfrequency week of onsetfrequency6-Aug 1 8/4-8/10 1
8/14/2002 1 8/11-8/17 38/15/2002 1 8/18-8/24 118/16/2002 1 8/25-8/31 198/19/2002 1 9/1-9/7 358/20/2002 2 9/8-9/14 588/21/2002 2 9/15-9/21 588/23/2002 2 9/22-9/28 328/24/2002 4 9/29-10/5 338/25/2002 2 10/6-10/12 168/26/2002 1 10/13-10/19 128/27/2002 1 10/20-10/26 48/28/2002 1 10/27-11/2 38/29/2002 38/30/2002 88/31/2002 29/1/2002 59/2/2002 29/3/2002 109/4/2002 49/5/2002 49/6/2002 29/7/2002 89/8/2002 29/9/2002 12
9/10/2002 79/11/2002 99/12/2002 109/13/2002 109/14/2002 89/15/2002 89/16/2002 109/17/2002 79/18/2002 99/19/2002 79/20/2002 129/21/2002 59/22/2002 29/23/2002 49/24/2002 29/25/2002 59/26/2002 69/27/2002 69/28/2002 79/29/2002 29/30/2002 410/1/2002 10
West Nile Virus onset in 2002
13
11
19
35
58 58
32 33
1612
4 3
0
10
20
30
40
50
60
70
frequency
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Michigan 2002 Equine WNV cases:
Morbidity/Mortality Stats… Mortality reports
available on 310 of 341 total cases.
179 recovered (63%)
85 euthanized (30%)
20 deaths (7%) 0
50
100
150
200
250
300
350
M/M.
Total Cases
Records
avail.
Recovered
Euthanized
Died
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Michigan 2002 Equine WNV cases:
Vaccination Stats… Vaccination history
available on 310 of 341 total cases.
272 not vacc. (88%)
25 improperly vacc. (8%)
13 vaccinated (4%)0
50
100
150
200
250
300
350
Vaccinated
Total Cases
Records avail.
Not Vacc.
Improper Vacc.
Vacc.
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Michigan 2002 Equine WNV cases:
No statistical difference in sickness and/or death based on age, breed or gender.
Unknown denominators: Vaccine saturation of State/National herd Sub-clinical infection level Naturally acquired immunity
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WNV: This year (2003)...
Surveillance Crows, Blue Jays by zipcode Dead bird sightings Mosquitoes Horses
Live: tested by pvt. veterinariansDead: tested by MDA
Dogs Other animals
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WNV: This year and Next (years)... Immunity?
Naturally acquiredbirdshumansHorses
Artificially acquiredEquine vaccine
• fully licensed as of 6 Feb. 2003• Dosing recommendations…
Similar to EEE, SLE? Other animals?
Dogs...
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For further information:
www.michigan.gov/mda
www.michigan.gov/mdch
After 1 April 2003… www.michigan.gov/westnilevirus
Others…