Surveillance du virus du Nil occidental

Le virus du Nil occidental (VNO) est une maladie à transmission vectorielle importante sur le plan de la santé publique en Ontario. Chaque semaine, nous analysons les données sur les moustiques, les humains et la météo dans la province afin de produire un rapport de surveillance hebdomadaire sur ce vecteur. Les données sur les moustiques et les humains proviennent des bureaux de santé publique tandis que les données météorologiques proviennent d’Environnement Canada.

Les nombres de cas à jour sont disponibles tous les mercredis durant la saison du VNO. Les données des années précédentes sont mises à jour annuellement.

Ressources connexes (en anglais)

Glossary and Data Caveats

Pour consulter les anciens rapports, consultez la page anciens rapports (en anglais).

Surveillance Week 44 (October 29– November 4, 2017)

As of week 44, there have been 154 reported (confirmed or probable) human WNV cases:
28 from TOR 20 from OTT and WEC 11 from YRK
(one travel-related)
9 from PEEL
8 NIA 7 from SMD 6 from HAM
(one travel-related) and HAL
5 each from EOH and LGL
4 from GBO 3 each from DUR, HKP, PTC, and WAT 2 each from SUD and WDG 1 each from HDN, HPE, KFL, LAM, MSL, OXF, PDH, REN and TSK
As of week 41, there have been 305 WNV positive mosquito pools:
ALG (2) BRN (12)* CHK (9) DUR (7)*
ELG (1) EOH (3) GBO (1) HAL (29)
HAM (13) HDN (5) HKP (5) HPE (4)*
HUR (3) LAM (5) LGL (4) MSL (11)*
NIA (8) OTT (10) OXF (5) PDH (1)
PEEL (69) SMD (3) TOR (40) WAT (9)
WDG (2) WEC (27) YRK (17)

*There was one additional WNV positive pool from each health unit, located in a First Nation community.

Equine: Seven WNV equine cases has been reported: HAM, MSL, NIA (2), PDH (2), and WEC, for 2018.


The graphs below have the following common features including: interactive legend, a scrollbar (when applicable) to navigate the data, zoom in, zoom out, download graph data, annotate graph and export graph as an image.

Other Arboviruses and Mosquito Species of Interest

As of October 4, 2018 there have been 11 reported equine cases of Eastern Equine Encephalitis (EEEV) one from HAM, four from HDN, and six from NIA. There have been no reports of EEEV positive mosquito pools or human cases. 

  • Culiseta melanura is an important mosquito vector in the transmission cycle of EEEV as it is responsible for amplifying the virus in the bird population.
  • Although large numbers of Cq. perturbans can be identified in Ontario, this species is not considered a competent vector species in the transmission of WNV due to the presence of a substantial salivary gland barrier (Sardelisetal. 2001).

Vector-Borne Disease Activity in Other Jurisdictions

WNV Canada (January 1 to September 22, 2018):

  • 128 clinical human cases: MB (29), QC (62) and AB (37)
  • 257 WNV positive mosquito pools: MB (168), SK (50), and QC (39)

WNV United States (January 1 to October 2, 2018):

  • The Centers for Disease Control and Prevention (CDC) has reported 1611 human cases of WNV, with 48 states and the District of Columbia reporting WNV activity (people, birds, or mosquitoes).
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Maladies entériques, zoonotiques et à transmission vectorielle

Publié le 6 févr. 2019