West Nile Virus – Evidence in Alberta 2003

2003 Summary

Human cases

There were 275 cases of WNv reported in Alberta in 2003. There were 48 cases (17.5 per cent) of West Nile Neurological Syndrome and 223 cases (81.1 per cent) of West Nile virus Fever. There were three asymptomatic cases (1.1 per cent) and in one case the clinical categorization was unknown.

Health Region WNv No symptoms WNv non-neurological syndrome (formaly WNv fever) WNv neurological syndrome
R1-Chinook   30 7
R2-Palliser 2 110 19
R3-Calgary 1 28 8
R4-David Thompson   21 6
R5-East Central   16 2
R6-Capital   17 4
R7-Aspen     2
R8-Peace Country      
R9-Nothern Lights   2  
Provincial total 3 224 48

Surveillance

Birds 1,843 tested 439 positive
Horses 202 tested 170 positive

Mosquito pools

 1,387 tested 31 positive

(February 25, 2004)