A new, more severe and contagious influenza virus is circulating this season. It’s called subclade K, or more colloquially, “superflu.” “Overall, this is likely to be a very bad respiratory season,” reports Public Health Emergency Specialist Jay Reddy, MD, with concurrent surges in influenza and respiratory syncytial virus cases. Here’s everything you need to know about protecting your health and treating symptoms of the 2025 superflu.
What is a “superflu,” a new strain of influenza?
Three main types of influenza strains circulate each winter, and during this season, an evolved form of the H3N2 influenza A strain appears to dominate. Public health expert and infectious disease specialist Tyler B. Evans, MD, MS, MPH, CEO and co-founder of the Health Equity Alliance, explained that this variant, known as subtype K or superflu, is stronger than usual and peaks earlier in the flu season, especially in the UK.
Why is the superflu so powerful?
“Subclade K is definitely going to be an issue this flu season in the United States,” said Dr. Reddy, chief scientific officer at HealthTrackRx. “CDC data from the second week of December shows that subclade K accounts for about 80 percent of all confirmed positive influenza cases.” He added, “Subclade K has seven different mutations that allow the virus to evade immune protection from previous vaccination or influenza infection.”
In fact, the National Health Service said hospital admissions in the UK increased by 55% in just one week in December, describing this “worst-case scenario” superflu surge. This subtype of the flu virus has hit the United States, with an 80% increase in flu cases in New York state.
Influenza A symptoms: What to watch out for during super flu
The symptoms of the new influenza virus are similar to those of the regular flu, but it is more intense, more contagious and occurs more quickly. Super flu symptoms include:
• High fever
• pain
• fatigue
• Cough and sore throat
• Runny nose or sinus pressure
• Headache
• Chills and sweating
• Gastrointestinal problems such as diarrhea and vomiting
• Difficulty sleeping
• Loss of appetite
Can the flu vaccine prevent superflu?
Why is there a surge in flu this year? Dr. Evans, who has worked on the front lines of major disease outbreaks and led the New York City Office of Emergency Management’s COVID-19 medical response, said: “This strain may lead to a more severe flu season because it is different from the predicted virus used in this season’s flu vaccine.” In other words, this strain is not a match for this year’s seasonal flu vaccine.
But even without a perfect match, “the flu vaccine is still the best defense against this virus and the many other flu viruses that will be circulating this season,” Dr. Evans said. “Early research suggests this year’s flu vaccine is still effective in protecting people against this new flu virus, but the flu season is still young.”
How to Treat Super Flu Symptoms
Dr. Evans said that in addition to the flu vaccine, “new subgroup K viruses are susceptible to influenza antiviral drugs, which should be prescribed as directed.” These include drugs such as Tamiflu, which when taken within 48 hours of the onset of symptoms can help shorten the course of the illness and reduce potential complications.
Dr. Evans added, “If you start to feel sick and develop symptoms such as fever, cough, or body aches, tell your health care provider right away. Starting treatment early can make a big difference in how quickly you recover.” Resting and staying hydrated can also help speed recovery from this new flu virus. These steps are especially important for high-risk groups, including children, the elderly and people with compromised immune systems. People with underlying medical conditions, such as chronic obstructive pulmonary disease and diabetes, are also at increased risk for flu-related complications.
But don’t suffer in silence. About 88% of Americans experienced respiratory symptoms last year. But according to the Respiratory Season Trends Survey conducted by HealthTrackRx, about 47% of people say medical costs prevent them from seeking help, and 14% do not see a health care provider at all when they are sick.
If you’re on a tight budget and want free health advice, consider the following:
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Ask your pharmacist to answer your health questions
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Check out MedlinePlus, the National Institutes of Health’s website, which has lots of free information
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Call the largest hospital near you and ask about free medical clinics in your area
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Looking for telehealth services that offer free or low-cost pay-per-view virtual calls
Take precautions now against super flu
Looking ahead, Dr. Evans said, “It’s not too late to get a flu shot. Getting vaccinated can help protect you as long as the flu is circulating.”
He added: “If you get a flu shot, it may convert severe illness into a milder illness, even if it doesn’t completely prevent you from getting the flu. This is true for all flu viruses. Think of the vaccine as changing the flu from ‘wild type to mild’.” It can help prevent severe illness even if you still get infected. This really helps to tame the beast! “
Dr. Reddy also recommends taking the following precautions: “Avoid other people when they are sick, practice good hand hygiene, especially in public places, and stay home when you or a family member is sick.”
Bottom line: “Some protection is much better than none,” says Dr. Evans.
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This content is not intended to be a substitute for professional medical advice or diagnosis. Always consult your doctor before undertaking any treatment plan.
