Dangerous Flu Mutation Sweeps Nation As Experts Warn of ‘Pretty Severe Variant’
Health officials are warning that this year’s flu season is being shaped by a particularly transmissible and hard-hitting strain that is rapidly gaining ground across the country.
The surge is being linked to a newly identified offshoot of influenza A (H3N2), known as subclade K. Public health monitoring shows that this mutation has become dominant in recent samples, both internationally and within the United States.
In a recent update, the World Health Organization described subclade K as a significant shift in the evolution of H3N2 viruses, raising concerns among researchers about how closely this season’s flu vaccine matches the circulating strain.
Doctors say patients infected with the K variant are often experiencing more pronounced symptoms than usual. Reported complaints include high fever, shaking chills, head pain, exhaustion, persistent cough, sore throat, and nasal congestion.
Data from the CDC indicates that nearly 90% of 216 recently analyzed H3N2 samples collected since late September were identified as subclade K, underscoring how quickly the variant has taken hold.
Respiratory illness activity is especially elevated in parts of the Northeast and several other regions. Surveillance tracking outpatient visits — not limited to confirmed flu cases — shows very high levels in New York City, New York State, New Jersey, Rhode Island, Louisiana, and Colorado. High activity has also been reported across multiple additional states and in Washington, D.C.
So far this season, federal estimates attribute at least 4.6 million illnesses, roughly 49,000 hospital admissions, and approximately 1,900 deaths to influenza.
Speaking with Fox News Digital, Dr. Neil Maniar, a professor of public health practice at Northeastern University, said early patterns suggest an unusually severe flu season. He noted that areas overseas where subclade K circulated earlier saw substantial illness, a trend that now appears to be emerging domestically as well.
Maniar described the current situation as a “perfect storm,” pointing to a combination of lower overall vaccination rates and uncertainty about how precisely this year’s vaccine targets the mutation. While the vaccine remains strongly recommended, he explained that a less-than-ideal match could be contributing to the intensity of cases being reported.
Despite these concerns, Maniar emphasized that getting vaccinated remains worthwhile, even now. Peak flu activity has not yet arrived, and the vaccine still offers important protection against severe outcomes linked to the K variant.
He also cautioned that flu complications are not limited to high-risk groups. Healthy individuals can become seriously ill, particularly as colder weather and indoor gatherings increase exposure risks. According to Maniar, partial immunity can begin developing within days of vaccination, with full protection generally reached within two weeks — making this an important window for those who have not yet received their flu shot.
{Matzav.com}
