Bird Flu Outbreak 2025 Map Ontario. Avian influenza a (h5n1) clade 2.3.4.4b was first detected in canada in 2021 and continues to circulate worldwide with ongoing detections in various wild, domestic and backyard bird populations, and has also been detected in various wild and domestic mammalian species. Canada has been managing the outbreak of avian influenza since its first detection in poultry here in december 2021.
As far back as the 1990s, scientists warned that a new form of avian influenza could spark another flu pandemic. The arrival of the virus in ontario comes at the same time as concerns continue to mount over a highly contagious form of avian flu, which has made the jump from poultry to cows and even.