Toronto Confirms First West Nile Virus Case of 2026

The first human case of West Nile virus for 2026 has been confirmed in Toronto. An adult resident has contracted the illness, which is transmitted through the bite of an infected mosquito.

Symptoms of West Nile virus typically appear between two and 14 days after an infected mosquito bite. These can include fever, headache, nausea, vomiting, body aches, skin rash, swollen lymph glands, and a stiff neck. Individuals who are older or have weakened immune systems face a higher risk of developing severe illness.

To reduce the risk of infection, Toronto Public Health advises residents to take protective measures when outdoors. This includes wearing light-coloured, long-sleeved clothing and using insect repellent approved by Health Canada. Eliminating sources of standing water where mosquitoes can breed is also recommended, as is being cautious during dusk and dawn when mosquitoes are most active. Ensuring window and door screens are properly fitted can also help prevent entry.

As of September 2025, Toronto had recorded 26 West Nile virus cases. In contrast, only 14 cases were confirmed in the city during the previous year, 2026.