H3N2 Flu Strain Spreads Rapidly: Why Subclade K Hits Hard
Canada is currently facing a significant increase in hospitalizations due to the H3N2 influenza strain. Health officials report that flu cases are surging across the nation, with all regions experiencing a rapid rise in influenza activity.
Current H3N2 Flu Situation in Canada
In the first week of December, Canada recorded 6,799 confirmed flu cases and 91 outbreaks nationwide. This represents a 20.2 percent increase in positive tests compared to the previous week. Hospitalizations also rose, reaching 3.6 per 100,000 of the population.
Impact of Subclade K
The dominant strain identified both in Canada and the United States is the H3N2 strain, particularly the A(H3N2) subclade K variant. This specific subclade is reportedly exacerbating the severity of infections.
- Children under 19 are particularly affected, with a notable spike in infections.
- In Ottawa, three children aged five to nine died from flu-related complications.
- Emergency rooms in Alberta are overwhelmed, with cases rising by 70 percent within a week.
Increased Vulnerability Among Youth
Health Canada advises that children under five face a higher risk of severe illness due to their developing immune systems. Schools and child-care settings are hotspots for flu transmission.
In the Children’s Hospital of Eastern Ontario, the number of children testing positive for the flu increased eightfold in November compared to last year, with hospitalizations also doubling.
Broader Implications Across Regions
As Canadians prepare for holiday travel, health experts predict a more intense flu season this year. According to Dr. Isaac Bogoch, an infectious disease specialist, Canada may experience increased hospitalizations and strain on the healthcare system.
Flu Trends in Other Countries
The impact of the H3N2 strain is not limited to Canada. In the U.K., flu hospitalizations surged by over 50 percent in just one week, with an average of 2,660 patients receiving treatment daily. Meanwhile, in the U.S., influenza infections are on the rise in 43 states.
Vaccination and Prevention Measures
Experts emphasize the importance of vaccination, even as the H3N2 variant poses challenges. Dr. Fahad Razak noted that while the vaccine’s efficacy may be reduced against this strain, it still provides crucial protection against severe illness.
- Being vaccinated greatly reduces the risk of hospitalization and severe complications from the flu.
- Health Canada recommends vaccinations as a key preventive measure against respiratory illnesses.
In addition to vaccination, individuals are urged to follow safety protocols, including:
- Staying home if sick
- Wearing masks in crowded settings
- Practicing good hygiene, such as hand washing and cleaning surfaces
These measures are vital for protecting vulnerable populations, including the elderly and young children, from the severe impacts of the flu.
