1. WNV – Ontario 2002 Preliminary Overview of Human Case Questionnaire Data

2. Data Sources Questionnaires sent by HU to PHB Data entry by PHB staff Laboratory Reports from Winnipeg

3. WNV Kills Older People Confirmed (n=69) Probable (n=43) Non-fatalMean age: 54.4 yrs Mean age: 51.5 yrs DeathsMean age: 78.0 (n=2) Mean age: 72.0 (n=5)

4. WNV Presentation ConfirmedProbable Casesn=37n=28 Encephalitis20 (54.0%)11 (39.3%) Meningitis5 (13.5%)3 (10.7%) Other9 (24.3%)4 (14.3%) No Info3 (8.1%)10 (35.7%)

5. WNV Symptoms ConfirmedProbable Fever94.3%92.0% Headache70.6%92.0% Chills40.0%76.2% Muscle Pain45.5%69.6% Joint Pain31.3%68.2% Rash61.8%56.0% Altered Mental Status63.3%45.8% Visual Distortion37.9%38.9% Neck Stiffness35.5%57.9% Seizures3.2%15.0%

6. Self-reported Exposure Info ConfirmedProbable Never Outside1 (3.0%)0 Rarely Outside1 (3.0%)2 (7.7%) Sometime Outside13 (39.4%)7 (26.9%) Lots of time Outside18 (54.5%)17 (65.4%) During 3 weeks pre- onset: Report Mosquito Bite14 (58.3%)10 (55.6%) Use repellant22 (78.6%)22 (95.6%) Handle dead birds2 (7.4%)3 (13.6%)