07/19/2025
This summer, Vancouver Coastal Health (VCH) Public Health and the BC Centre for Disease Control — together with partners from Líl̓wat Nation, Squamish Nation and the University of BC — are undertaking a small-scale mosquito surveillance pilot project in the Sea to Sky region to better understand the local mosquito population and the viruses they carry.
VCH is advising residents and travellers to the Sea to Sky area to take preventative measures against mosquito bites, between now and fall. If you do get bitten, seek health care if you develop neurological symptoms like confusion, seizures or severe headaches with fever.
Prevention
This advice is in response to California serogroup (CSG) viruses. Any action that helps prevent mosquito bites or breeding can reduce the risk of infection with CSG viruses. Simple ways to protect yourself include:
• Use mosquito repellent – Applying a mosquito repellent to areas of exposed skin is an excellent way to prevent mosquito bites. Check the product label for instructions on proper use.
• Wear protective clothing – Avoid dark clothing as it tends to attract mosquitoes. In areas with a lot of mosquitoes, wear full-length pants and a long-sleeved shirt.
• Install mosquito screens on windows – Consider staying indoors or in enclosed areas with screens when mosquitoes are most active or abundant, which is typically from dusk to dawn.
• Prevent mosquitoes from breeding – Anything that can hold stagnant water could be a mosquito breeding site, even small amounts. Identify and remove these areas on your property during mosquito season, this might include emptying saucers under flowerpots, changing water in birdbaths twice a week, unclogging rain gutters, draining tarps, tires and other debris where rainwater may collect, and installing a fountain to ornamental ponds or stocking them with fish. Backyard pools can also be a significant breeding ground for mosquitoes if not maintained regularly.
Read more about CSG viruses and the VCH surveillance project following a small cluster of illnesses at the link: https://www.vch.ca/en/news/new-pilot-project-study-mosquito-population-sea-sky-region