West Nile Virus


WNV is a mosquito-borne disease, endemic in Peel region since 2001. In 2018, there were 137 human WNV cases in Ontario; 6 of these were in Peel region. Peel region has not had any cases this year. However, we expect increased WNV activity in the coming weeks. The number of human WNV cases and positive mosquito pools varies from year to year, with weather and precipitation playing a significant role.
Incubation period: typical 2-6 days but ranges from 2 to 15 days.
Clinical presentation:
Most cases are asymptomatic.
Fever, headache, body aches, fatigue, skin rash on the stomach, chest or back, swollen lymph nodes, nausea and vomiting, eye pain and photophobia
1% will develop neuro-invasive disease including meningitis, encephalitis and acute flaccid paralysis.
Contact your physician if you suspect WNV infection.