West Nile Virus Surveillance Summary #6

Feb. 10, 2010, 10:46 a.m.

 

Thursday, August 20, 2009

WNV Activity in BC

(Data as of August 19, 2009)

 

No WNV activity has been identified in BC to date. 

 

The BCCDC webpage on West Nile can be viewed directly at: http://www.bccdc.ca/dis-cond/a-z/_w/WestNileVirus/default.htm

 

From June 1st, 2009

Human cases*

Corvids submitted

Corvids sighted

Mosquito pools

# Tested

110

90

334

1622

# Positive

0

0

 

0

 

*includes routine screening of CSF, organ and stem cell donations in addition to physician test requests

 

Maps and graphs of BC surveillance data can be found at: http://www.bccdc.ca/dis-cond/a-z/_w/WestNileVirus/Surveillance/WNv2009SurveillanceData.htm

 

3-month Environment Canada climate predictions for BC

The 3 month (August-October) temperature forecast calls for above normal temperatures for almost all of BC. http://www.weatheroffice.gc.ca/saisons/image_e.html?img=sfe1t_s

 

The 3 month precipitation forecast calls for below normal precipitation for coastal BC and normal precipitation for central and southern BC.

http://www.weatheroffice.gc.ca/saisons/image_e.html?img=sfe1p_s

 

Accumulated base 16 oC growing degree days comparison for select BC communities

  August 19th

2009

2008

2007

2006

2005

2004

2003

30YR

  Cranbrook

308

347

409

378

273

330

424

245

  Creston

439

414

562

494

392

465

550

311

  Osoyoos

662

601

625

620

610

721

701

486

  Kamloops

613

535

527

585

514

640

595

427

  Abbotsford

343

264

260

300

301

387

315

192

  Vancouver

256

190

192

214

211

291

243

148

  Victoria

226

174

180

210

217

265

231

134

  Prince George

224

178

182

216

171

241

184

128

 

 

Almost all communities are continuing to experience dramatically increased accumulated degree days compared to last year and the 30 year average.

 

WNV Activity in Canada

(Data as of August 19, 2009)

 

As of August 8, four positive mosquito pools have been reported from Saskatchewan, these are the first positive mosquito pools reported in 2009.  As previously reported, two positive dead birds tested by the Canadian Cooperative Wildlife Health Centre were reported from Ontario.  There have been no positive human cases reported in Canada in 2009.  Overall in Canada the activity has been lower compared to previous seasons.

WNV Activity in the US

„X     Washington:

o      There have been 206 positive pools, 7 positive birds and 12 positive horses.

o      Activity continues to be located in the southern and central Counties of Washington State (Adams, Benton, Franklin, Grant, Kittitas, Yakima).  The first western County (Mason) has also reported activity.

o      No human cases have been identified.

„X     Oregon: 

o      There have been 5 positive birds, 2 positive horses and 113 positive mosquito pools reported in Oregon. 

o      Activity has been reported in 5 Counties located in the north and eastern part of Oregon.

o      No human cases have been identified.

„X     California: 

o      35 Counties are reporting WNV activity. 

o      There have been 10 human cases reported in 2009 compared to 54 at the same time in 2008.

o      Positive indicators:  329 dead birds, 504 mosquito pools, 56 sentinel chicken flocks, 3 horses and 3 squirrels. All indicators continue to be lower compared to the same time in the 2008 season.

 

Other US states reporting WNV activity:

Data as of August 19; Sources:  USGS survey

 

82 human cases of WNV have been reported in 20 States (including Montana and Idaho).  63% of human cases have been reported as encephalitis/meningitis.  Three fatalities have been reported (Mississippi-2, Texas-1).  The number of human cases is lower compared to this point in the 2008 season. 

 

 

 

 

 

 

 

 

 

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