Canadian health officials are preparing for a potentially challenging flu season as influenza activity rises earlier than usual across the country. An evolving H3N2 strain, currently the most prevalent, has mutated and may reduce the effectiveness of this year’s flu vaccine. Despite this concern, experts strongly recommend vaccination, especially for vulnerable populations, as even a diminished vaccine response can lessen the burden on healthcare systems.
Health officials are bracing for a potentially challenging flu season, with early indicators suggesting the vaccine may be less effective this year due to a mutation in the dominant H3N2 strain. This comes as influenza activity begins to rise earlier than usual in parts of Canada.
Between November 9 and November 15, six new cases of influenza were reported in Prince Edward Island, three in Nova Scotia, and two in Newfoundland and Labrador. The previous week saw 45 cases identified in New Brunswick, signaling a rapid increase in infections.
Across Canada, the percentage of positive flu tests has reached 5.5%, a key indicator that the epidemic has begun, according to Guy Boivin, a microbiologist and infectious disease specialist at Laval University in Quebec City. This early start to the flu season is unusual, experts say.
“It’s rarely seen for flu seasons to begin in November.”
With H3N2, we have more severe symptoms
Currently, the H3N2 strain is the most prevalent of the three influenza viruses circulating. However, this strain has undergone several mutations, potentially reducing the effectiveness of this year’s vaccine. “The strain is different from what was included in the vaccine,” Boivin explained. The findings raise concerns about the level of protection the vaccine will offer this season.
This doesn’t mean our protection is at zero. It will be diminished, but how much, it’s too early to know.
he added.
Microbiologist Guy Boivin explains that the protection offered by the flu vaccine is diminished due to the mutation of the H3N2 strain. (File photo)
Photo : Radio-Canada / Pierre-Alexandre Bolduc
Benoît Barbeau, a virologist at the University of Quebec in Montreal, anticipates a more severe flu epidemic as a result. Understanding the potential severity of the season is crucial for public health preparedness.
“With H3N2, we have more severe symptoms, a higher risk of complications and hospitalization, particularly in the elderly.”
Limited but Necessary Protection
Despite the potential for reduced efficacy, scientists strongly recommend vaccination, particularly for those most vulnerable to severe illness. Vaccination remains a critical public health tool, even with evolving viral strains.
Not knowing exactly how effective it will be, it will at least have an impact on our healthcare system. We’ll have fewer people at risk of being hospitalized, that’s undeniable.
Barbeau emphasized.
For Guy Boivin, even limited protection against the virus is worthwhile.
Because there are other strains that may circulate this winter. For AH1N1 and B, the match between the vaccine strain and the circulating strain appears very good.
he noted.
The first peak of the flu season is expected within the next six weeks.
In the context of the holiday season, people will gather more, in less ventilated indoor spaces, transmission will occur more actively.
Barbeau pointed out.
It’s not too late to get vaccinated – the body generates protective antibodies 10 to 14 days after vaccination.
In Prince Edward Island, Dr. Heather Morrison, the province’s chief public health officer, assures that the island’s healthcare system is preparing for a potential increase in hospitalizations of patients with flu-like symptoms.
With information from the show Le Réveil from Prince Edward Island
