The Canadian Food Inspection Agency has identified a highly transmissible form of avian influenza in several samples gathered in southern Manitoba following an unusual mass death of birds. Approximately 500 bird carcasses, predominantly Canada geese, were discovered near waterways in the region early in December. While clusters of deceased birds were also located near the Red River north of Winnipeg’s Perimeter Highway, the greatest concentration was observed in a collection of ponds in Niverville.
Biologist Frank Baldwin from the Canadian Wildlife Service informed CBC News that bird samples tested positive for avian influenza, commonly known as bird flu, prompting further analysis to ascertain the specific strain. The Canadian Food Inspection Agency submitted 39 wild bird samples for testing on December 11, with results showing that 38 samples were infected with the highly pathogenic H5N1 strain of bird flu.
University of Manitoba researcher Hannah Wallace, specializing in viral immunology, expressed relief that the samples confirmed the presence of the H5N1 strain. While this strain typically causes significant disease and mortality in birds, Wallace had concerns that a potential mutation could lead to a more dangerous variant affecting both birds and humans. H5N1 has been previously detected in humans, raising worries about the possibility of a hybrid virus with increased severity for human populations.
According to Wallace, the H5N1 strain identified in the recent bird samples is prevalent among domestic poultry and wild bird populations in North America. She noted that previous exposure has provided some level of immunity to most Canadian birds, although weakened or undernourished birds may be more susceptible. Environmental studies suggest that avian influenza can persist in the environment, potentially surviving in ponds or river sediment even during colder months.
Avian influenza has been a long-standing concern for scientists and poultry farmers in Manitoba due to its contagious and lethal nature. Farmers, like Rod Wiebe from Manitoba Chicken Producers, face challenges in controlling the spread of bird flu, particularly during peak migration seasons in fall and spring when wild birds may transmit the virus to domestic poultry. Candace Lylyk, owner of Breezy Birds Farm in Morris, emphasized the importance of preventive measures to safeguard her farm against potential outbreaks, including restricting farm access and implementing biosecurity protocols.
The detection of the H5N1 strain in the bird population has raised awareness among stakeholders about the ongoing risks posed by avian influenza, prompting continued vigilance and preventive actions to protect both wildlife and poultry populations.
