West Nile Virus (WNV) in Horses Surveillance

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West Nile Virus (WNV) in Alberta Horses (2003 to 2016)

Year	Number of Confirmed Positive Cases	Number of Possible Cases	Number of Reactor Cases	Number of Suspect Cases
2003	170
2004	4
2005	3
2006	9
2007	46
2008	0
2009	1
2010	0
2011	0
2012	5
2013	14
2014	6
2015	10
2016	10
2017 *	11	2		1
2018	73	5	1	2
TOTAL	362	7	1	3

.As of

* Revised Case definitions, as per the OIE, for equine cases of Wet Nile Virus in 2017.

** total only includes confirmed positive cases from 2017 onwards as per revised case definitions.

Cases Reported in 2018: As of October 22 2018, a total of 82 cases had been received, of these there are 74 positives cases
(1 for a Saskatchewan horse tested by an Alberta Vet) so 73 Alberta positive cases, 7 possible cases, 1 reactor and 2 suspect cases.

Case Distibutions for 2018: The map below shows the locations of 71 cases that submission forms have been received for.

Re

The Office of the Chief Provincial Veterinarian was notified of the first confirmed "possible positive" equine case of West Nile Virus in 2018 on Thursday July 19 in horse in the County of Mountain View.

For more information about WNV in horses, please read the WNV Agri-Fact sheet.

Click here to return to the Office of the Chief Provincial Veterinarian page.

For more information about the content of this document, contact Brett Oliver-Lyons.
This document is maintained by Ana Ulmer-Franco.
This information published to the web on February 23, 2009.
Last Reviewed/Revised on November 8, 2018.