Alberta health officials have issued a renewed warning about West Nile virus as mosquito season begins across the province. The warning comes after a mild winter and wet spring created ideal breeding conditions for the Culex tarsalis mosquito, the primary carrier of the virus in Canada.
Increased Risk This Season
According to Alberta Health Services, the risk of West Nile virus infection is heightened this year due to favorable weather patterns. The virus can cause West Nile non-neurological syndrome, which includes fever, headache, and body aches, or more severe West Nile neurological syndrome, which can lead to meningitis or encephalitis. In rare cases, the infection can be fatal.
“We are seeing higher mosquito populations earlier than usual,” said Dr. Kristin Klein, a medical officer of health with Alberta Health Services. “It’s crucial that Albertans take steps to protect themselves and their families from mosquito bites.”
Prevention Measures
Health officials recommend using insect repellent containing DEET or icaridin, wearing long-sleeved shirts and pants when outdoors, and avoiding outdoor activities at dawn and dusk when mosquitoes are most active. Residents are also urged to eliminate standing water around homes, such as in bird baths, flower pots, and gutters, to reduce mosquito breeding sites.
“Simple actions like draining standing water and ensuring window screens are intact can significantly reduce mosquito populations near your home,” added Dr. Klein.
Historical Impact
West Nile virus first appeared in Alberta in 2003. Since then, the province has reported hundreds of human cases, with peaks in years with warm, wet summers. In 2024, Alberta recorded 45 confirmed cases, including two deaths. The virus also affects birds and horses, though it poses the greatest risk to humans.
“We want to remind everyone that West Nile virus is preventable,” said a spokesperson for Alberta Health. “By taking simple precautions, you can enjoy the outdoors safely.”
