The influenza virus is making a significant impact across the United States this holiday season, with at least 45 states reporting high levels of flu activity. Data from the U.S. Centers for Disease Control and Prevention indicates that outpatient visits for flu-like symptoms have hit a 25-year high.
Healthcare facilities are facing overwhelming demands as emergency rooms fill up with flu patients. Dr. Michael Phillips, director of the Division of Infectious Diseases at NYU Grossman School of Medicine, describes this season as exceptionally severe, noting a rapid increase in cases. The flu surge is primarily driven by a new variant of influenza A H3N2, known as subclade K, which has contributed to early and severe flu outbreaks in countries like Japan and the United Kingdom.
Health officials are warning that this flu season is not only more challenging than typical years but may continue to worsen, particularly among children. The CDC recorded over 11 million flu illnesses, 120,000 hospitalizations, and approximately 5,000 deaths so far this season, including nine pediatric deaths, though experts believe the actual numbers may be higher.
This season has already surpassed the previous year in terms of severity, with key metrics such as hospitalizations and positive testing rates indicating a worsening trend. Dr. Scott Roberts from Yale School of Medicine echoed concerns about the severity of the current flu season, calling it one of the worst since before the COVID-19 pandemic.
The dominant strain this season, subclade K of H3N2, accounts for about 90% of flu cases. While it is not necessarily more dangerous than other strains, variations in its mutations may help it evade immunity from past infections or vaccinations, leading to higher infection numbers.
Flu activity is widespread across almost all states, with the highest levels reported in locations such as Alabama, Colorado, Connecticut, and New York, which is experiencing one of its most challenging flu seasons on record. Hospitals in New York City, in particular, are witnessing a surge in flu-related hospitalizations, prompting concerns about capacity and patient care.
In addition to influenza cases, hospitals are also managing other respiratory viruses, compounding the crisis. Symptoms for the current flu season include high fever, chills, and body aches, with some patients also experiencing gastrointestinal issues, further straining healthcare resources.
Experts continue to stress the importance of flu vaccinations, indicating it is not too late to receive a flu shot. The current vaccine, while slightly mismatched with the circulating H3N2 strains, can still provide significant protection against severe illness and hospitalization. Recent data shows that the vaccine could reduce hospitalizations by 70-75% among children.
As flu season is expected to last until March or April, individuals, especially higher-risk populations, are encouraged to seek vaccination and remain vigilant about protective measures. This year’s flu season underscores the importance of community health and preparedness in the face of infectious diseases.