West Nile Virus Surveillance and Response U.S. National and Michigan 2002 Michigan Department of...
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Transcript of West Nile Virus Surveillance and Response U.S. National and Michigan 2002 Michigan Department of...
West Nile Virus Surveillance and Response
U.S. National and Michigan2002
Michigan Department of AgricultureAnimal Industry Division
Steven Halstead, D.V.M., M.S.
Acknowledging…
Kathryn Herbst, MSU CVM Class of 2004
Dr. Jon Patterson, MSU DCPAHDr. Roger Maes, MSU DCPAH
VirologyDr. Judy Marteniuk, MSU CVM LACS
WNV Transmission Cycle
WNV and Animals
Mosquitoes Birds
wild domestic
HorsesHumansOther
animals?
From: www.thehorse.com
National Equine WNV Cases
Equine WNV Clinical Disease
Listlessness (Headache, flu-like) Fever Skin twitching Muscle fasciculations Stumbling Incoordination Weakness of limbs Ataxia Partial paralysis Possible death
Equine WNV Facial Paralysis
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.)
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
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) .
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.
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
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
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.
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
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
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...
For further information:
www.michigan.gov/mda
www.michigan.gov/mdch
After 1 April 2003… www.michigan.gov/westnilevirus
Others…