First human case of West Nile virus in 2026 confirmed in Peel region

BRAMPTON, ON (September 2, 2026) – Peel Public Health has confirmed the first human case of West Nile virus in Peel region this year. It is a reminder for residents to take precautions against mosquito bites, even into the fall months.

West Nile virus is passed to humans through the bite of an infected mosquito. Most people infected with the virus do not develop symptoms. In some cases, symptoms may include fever, headache, body aches, fatigue, nausea, vomiting or skin rash. Rarely, the virus can cause serious illness, such as swelling of the brain or spinal cord.

Older adults, people with weakened immune systems, and those with certain chronic conditions are at higher risk for serious complications.

Peel Public Health identified the first mosquitoes positive for West Nile virus this season on July 27, 2026. Since then, the health unit has continued to monitor mosquito activity across Brampton, Mississauga and Caledon through its annual surveillance program.

Residents are encouraged to protect themselves from mosquito bites by:

• Applying an approved insect repellent containing an ingredient effective against mosquitoes, such as DEET or icaridin, to exposed skin and clothing. Read and follow the manufacturer’s directions for safe use.
• Avoiding areas with large mosquito populations and taking extra precautions between dusk and dawn when mosquitoes are most active, and at any time in or near shady, wooded areas.
• Wearing light-coloured, tightly woven, loose-fitting clothing such as long pants, a long-sleeved shirt, shoes, and socks to protect exposed skin.
• Making sure all window and door screens fit securely and are free of tears and holes.
• Keeping rain barrels tightly covered with screen mesh.
• Removing or draining items on your property that collect standing water. Water that is stagnant for more than seven days is an ideal breeding site for mosquitoes. You can report stagnant water sites to Peel Public Health at 905-799-7700 or online.

NOTE: Infants younger than 6 months old, should not use an insect repellent containing DEET or icaridin. Instead, use a mosquito net when babies are outdoors in a crib or stroller.

Residents can register online to receive email notifications and information about where mosquitos have tested positive for West Nile virus were found in Peel.

For more information about West Nile virus, visit our website or call Peel Public Health at 905-799-7700 from 8:30 a.m. to 4:30 p.m., Monday to Friday, or toll-free at 1-888-919-7800.