Surge in H3N2 Flu Cases Leads to Increased Hospitalizations; Canadians Advised to Remain Cautious

The recent H3N2 flu strain is causing a significant spike in hospital admissions throughout the United States, prompting health officials to urge Canadians to stay alert as a similar rise in cases is anticipated.

The U.S. Centers for Disease Control and Prevention (CDC) reports that around 7.5 million Americans have experienced flu symptoms this season, with over 81,000 requiring hospitalization. Hospitalization rates have hit record highs in multiple regions, foreshadowing a potentially severe flu season ahead.

Data for the week ending December 20 reveals that 25.6% of flu tests in the U.S. returned positive results—a sharp increase from 15.7% the previous week, up from just 9% two weeks prior. During that same timeframe, 19,053 Americans were hospitalized due to flu-related illnesses, including the tragic loss of five children attributed to influenza.

This year's predominant strain is the H3N2 subclade K, known for its heightened severity and widespread effects.

Canadian health experts, including Dr. Fahad Razak from St. Michael's Hospital and the University of Toronto, caution that Canada may soon face a similarly intense flu season. “Data indicates that we’re anticipating a particularly severe flu season here as well,” Dr. Razak remarked.

He noted concerning flu patterns in Europe, the U.S., Australia, and Japan, describing this as one of the harshest flu seasons seen in years. Increased travel across the Canada-U.S. border during the holiday season further raises the risk of quick flu transmission.

“It's nearly impossible to sidestep the spread when illness rates are surging on one side of our border,” Dr. Razak explained.

According to Health Canada’s latest report, flu hospitalizations have almost doubled in a week, with infection rates climbing by nearly 30%. For the week ending December 13, 27.7% of flu tests in Canada were positive, resulting in 11,646 new flu cases. More data covering the Christmas period will be available soon.

Dr. Razak stressed the importance of vaccination, especially as children prepare to go back to school. “If your child hasn’t been vaccinated yet, now is the time. Vaccination is our strongest shield against severe illness,” he urged.

With increasing infections and subsequent hospitalizations, experts emphasize that timely vaccinations and ongoing vigilance are crucial to mitigate the flu’s effects this season.