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Itisha Arya

New Flu Symptoms Raise Alarm As ‘Aggressive’ Strain Spreads Rapidly: Where Is It Spreading The Most In US

new flu symptoms 2025

A newly identified flu strain that spreads easily and causes more severe illness is driving infections this season. The strain, a mutated form of influenza A H3N2 known as subclade K, has been linked to a growing number of cases worldwide, including across the United States. 

According to the World Health Organization, the K variant represents “a notable evolution in influenza A (H3N2) viruses,” prompting concerns among experts about how well this season’s flu vaccine may work against it.

Health specialists say the K variant is associated with stronger flu symptoms such as fever, chills, headaches, exhaustion, cough, sore throat, and a runny nose. A CDC report found that of the 216 influenza A(H3N2) samples collected since September 28, nearly 90 percent were identified as subclade K. As this strain continues to circulate, here is a closer look at the symptoms being reported and the areas where flu activity is currently highest.

<h2><span rel="noindex">New Flu Symptoms</span></h2>

Doctors say the symptoms caused by the mutated H3N2 strain closely resemble those of typical seasonal influenza A. Common symptoms include:

<ul><li>Fever</li><li>Chills</li><li>Body aches</li><li>Headache</li><li>Severe fatigue</li><li>Nasal congestion or a runny nose</li><li>Cough</li></ul>

Flu symptoms often come on abruptly, Hopkins explains, describing it as a sudden, overwhelming feeling of being unwell.

The CDC notes that flu symptoms can overlap with those of COVID-19 and other respiratory viruses, making testing important. Three-in-one rapid home tests that check for influenza A, influenza B, and COVID-19 are now available, and experts advise keeping them on hand when possible. If you test positive for the flu, antiviral medications may help shorten the illness and lessen symptom severity, Hopkins adds.

<ul><li></li></ul><h2><span rel="noindex">Flu Shots</span>: Where Is Subclade K Spreading In The US?</h2>

Below are the states and regions reporting the highest levels of medical visits related to flu-like illness, which may not reflect confirmed flu cases. The data reflects CDC reporting for the week ending December 25.

<ul><li>New Jersey</li><li>Rhode Island</li><li>Louisiana</li><li>Colorado</li></ul>

<ul><li>Massachusetts</li><li>Connecticut</li><li>Michigan</li><li>Idaho</li><li>South Carolina</li></ul>

<ul><li>Washington, D.C.</li><li>Maryland</li><li>North Carolina</li><li>Georgia</li></ul>

The CDC estimates that the flu has already caused at least 4.6 million illnesses, 49,000 hospitalizations, and 1,900 deaths so far this season. Health officials continue to recommend the flu vaccine as the most effective way to reduce the risk of serious illness.

<h2><span rel="noindex">Super Flu Symptoms</span>: How to Protect Yourself From the Flu</h2>

During peak respiratory virus season, experts advise taking basic precautions to lower your risk and protect others:

<ul><li>Keep vaccinations up to date.</li><li>Get tested if symptoms appear.</li><li>If you test positive, stay home until you are fever-free for 24 hours without medication and your symptoms are improving. If you do not have a fever, remain home for five days after symptoms begin.</li><li>Avoid close contact with people who are sick.</li><li>Wear a mask in crowded indoor settings.</li><li>Wash your hands often.</li><li>Cover your mouth and nose when coughing or sneezing.</li></ul>

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A newly identified flu strain that spreads easily and causes more severe illness is driving infections this season. The strain, a mutated form of influenza A H3N2 known as subclade K, has been linked to a growing number of cases worldwide, including across the United States. According to the World Health Organization, the K variant represents “a notable evolution in influenza A (H3N2) viruses,” prompting concerns among experts about how well this season’s flu vaccine may work against it.Health specialists say the K variant is associated with stronger flu symptoms such as fever, chills, headaches, exhaustion, cough, sore throat, and a runny nose. A CDC report found that of the 216 influenza A(H3N2) samples collected since September 28, nearly 90 percent were identified as subclade K. As this strain continues to circulate, here is a closer look at the symptoms being reported and the areas where flu activity is currently highest.New Flu SymptomsDoctors say the symptoms caused by the mutated H3N2 strain closely resemble those of typical seasonal influenza A. Common symptoms include:FeverChillsBody achesHeadacheSevere fatigueNasal congestion or a runny noseCoughFlu symptoms often come on abruptly, Hopkins explains, describing it as a sudden, overwhelming feeling of being unwell.The CDC notes that flu symptoms can overlap with those of COVID-19 and other respiratory viruses, making testing important. Three-in-one rapid home tests that check for influenza A, influenza B, and COVID-19 are now available, and experts advise keeping them on hand when possible. If you test positive for the flu, antiviral medications may help shorten the illness and lessen symptom severity, Hopkins adds.Flu Shots: Where Is Subclade K Spreading In The US?Below are the states and regions reporting the highest levels of medical visits related to flu-like illness, which may not reflect confirmed flu cases. The data reflects CDC reporting for the week ending December 25.Very High (Level 1)New York CityVery High (Level 2)New York StateVery High (Level 3)New JerseyRhode IslandLouisianaColoradoHigh (Level 1)MassachusettsConnecticutMichiganIdahoSouth CarolinaHigh (Level 2)New MexicoHigh (Level 3)Washington, D.C.MarylandNorth CarolinaGeorgiaThe CDC estimates that the flu has already caused at least 4.6 million illnesses, 49,000 hospitalizations, and 1,900 deaths so far this season. Health officials continue to recommend the flu vaccine as the most effective way to reduce the risk of serious illness.Super Flu Symptoms: How to Protect Yourself From the FluDuring peak respiratory virus season, experts advise taking basic precautions to lower your risk and protect others:Keep vaccinations up to date.Get tested if symptoms appear.If you test positive, stay home until you are fever-free for 24 hours without medication and your symptoms are improving. If you do not have a fever, remain home for five days after symptoms begin.Avoid close contact with people who are sick.Wear a mask in crowded indoor settings.Wash your hands often.Cover your mouth and nose when coughing or sneezing.

new flu symptoms raise alarm as ‘aggressive’ strain spreads rapidly: where it’s spreading the most

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