Surveillance du virus du Nil occidental (en anglais)

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 (Oct 28-Nov 3, 2018)

Provincial Trends

As of week 44, there have been 137 reported (confirmed or probable) human WNV cases, three of which are travel-related:
BRN (6) CHK (1) DUR (5) EOH (1)
GBO (3) HAL (4) HAM (7) HDN (6)
HKP (1) KFL (1) LAM (3) LGL (2)
MSL (11) (1 travel-related) NIA (8) NPS (1) OTT (7) (1 travel-related)
OXF (1) PEEL (6) PTC (1) SMD (1)
SUD (1) TOR (39) WAT (5) (1 travel-related) WEC (13)
YRK (3)

As of week 44, 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: Eleven WNV equine cases has been reported: ELG, HAM, MSL, NIA (2), OXF (3),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 30, 2018 there have been 13 reported equine cases of Eastern Equine Encephalitis (EEEV) one each from HAM and HPE, four from HDN, and seven 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 October 20, 2018):

  • 203 clinical human cases: MB (31), QC (127) and AB (45)
  • 266 WNV positive mosquito pools: MB (168), SK (52), and QC (46)

WNV United States (January 1 to October 30, 2018):

  • The Centers for Disease Control and Prevention (CDC) has reported 2204 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

Mis à jour le 12 avr. 2019