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

Glossary and Data Caveats (en anglais)

Pour consulter les anciens rapports, consultez la page anciens rapports

Provincial Trends



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 September 25, 2019 there has been seven reported equine cases of Eastern Equine Encephalitis (EEEV), with two each from LGL and SUD, and one each from HAM, HPE, and, THB.

There have been two EEEV positive mosquito pools, one each from the Wahta Mohawk Community and WEC; and no reports of EEEV 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 (Sardelis et al. 2001).

Vector-Borne Disease Activity in Other Jurisdictions

WNV Canada (January 1 to October 12, 2019):

  • Fifteen human cases reported: Alberta (4) British Columbia (1), and Quebec (10)
  • Nineteen positive mosquito pools in Quebec and six in Manitoba

WNV United States (January 1 to October 29, 2019):

  • The Centers for Disease Control and Prevention (CDC) has reported 788 human cases of WNV, with 47 states and the District of Columbia reporting WNV activity (people, birds, or mosquitoes).
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Maladies entériques, zoonotiques et à transmission vectorielle

Mis à jour le 11 déc. 2019