B.C. Health officials set up mosquito traps in the Sea to Sky region for study

VANCOUVER — Mosquito traps have been set up across the Sea-to-Sky region in British Columbia as health officials launch a pilot project to understand the area’s mosquitoes and the illnesses they spread.

Vancouver Coastal Health says there were four cases of mosquito-borne illnesses late last year, that resulted in swelling of the brain, and all the patients likely acquired the infections in the area along Howe Sound and north to Whistler and Pemberton.

Dr. Moliehi Khaketla, medical health officer for Vancouver Coastal Health, says the viruses aren’t new to B.C., but it’s unusual to see the “very severe” human cases.

The health authority says the four patients have already recovered from their illness.

The mosquito project will last for three months, and Vancouver Coastal Health says they hope to learn more about the risk to the public, the in meantime, those in the area should take preventive measures against mosquito bites.

The mosquito-borne illnesses, part of the so-called California Serogroup viruses, usually do not cause symptoms, but when they do occur, they are flu-like, with a fever, headache, fatigue and occasional nausea or vomiting.

The health authority says those who have been in the Sea-to-Sky region and develop symptoms of severe headaches with fever or seizures are advised to seek care immediately.

This report by The Canadian Press was first published July, 18, 2025.

The Canadian Press