Protecting yourself from the severe flu strain Subclade K involves the same proven steps used during past flu seasons, with extra attention to consistency. Compared to milder flu seasons, a strain like Subclade K may lead to higher rates of doctor visits, hospitalizations, and missed work or school days. Finally, early flu seasons driven by new variants often lead to more widespread illness before immunity builds up in the community.
‘Super flu’ skyrockets over holidays. What are the symptoms of H3N2?
Most people who get the flu will recover in a few days to less than two weeks. The CDC reports that people with the flu are most contagious during the first three days of their illness. Subclade K is a variant of the H3N2 virus, which is a subtype of influenza A. Influenza A(H3N2) viruses are the most frequently reported flu viruses this season.
Influenza viruses naturally change over time through small genetic mutations. The flu can cause mild to severe illness, which can lead to death in certain cases. To start, experts strongly recommend receiving a flu shot, as it is the most effective way to prevent serious illness from the flu.
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To start, experts highly recommend getting a flu shot, considering it the most effective way to prevent serious illness from the flu. It is not possible to predict what each flu season will be like in Florida.” The organization has noted that it is not yet clear whether the new flu strain is causing more infections or more severe cases.
The key difference lies in how widely and quickly the virus spreads and how many people become sick at the same time. Many readers wonder if this new flu variant feels different from past flu infections. Some people, especially older adults, may experience more intense fatigue or complications such as pneumonia. Severity here refers more to the potential impact on healthcare systems and vulnerable groups than to dramatically different symptoms in every patient.
Flu symptoms to know
Staying informed and prepared is the most practical response to emerging variants. However, experts continue to stress that flu vaccination remains the best defense. Current vaccines were developed before Subclade K became widespread, which means the match may not be perfect. Beyond complications, the flu can cause chronic medical problems like asthma or chronic heart disease to worsen Young children and people with weakened immune systems may be contagious for longer periods of time. Flu season typically begins around late September or early October, when temperatures start to cool, and usually lasts until the following summer, in May.
- Flu season typically starts around late September or early October, when the weather begins to cool down, and usually lasts until the following summer, in May.
- CDC data through Dec. 27 showed that just under 33% (23,350) of the 70,757 flu tests administered that week were reported positive to the National Respiratory and Enteric Virus Surveillance System.
- For the first time since 1997, when flu data was first tracked, 8% of visits to medical professionals were related to the flu or a flu-like illness the week ending Dec. 27, according to the CDC.
For the first time since 1997, when flu data was first tracked, 8% of visits to medical professionals were related to the flu or a flu-like illness the week ending Dec. 27, according to the CDC. Flu activity is exploding across the United States this flu and cold season, in some cases reaching record highs, according to new Centers for Disease Control and Prevention data. Again, health officials warn that GI symptoms are increasing, particularly in adults, with the new strain, however.
Dubbed the “super flu,” the latest influenza strain, Subclade K (A(H3N2), J.2.4.1), is a mutation of the influenza virus. Each year, the seasonal flu shot is formulated to target the strains most commonly circulating. A new flu strain that has been dominating cold and flu season overseas has also taken over in the U.S.
Warning signs to watch for
Illinois also on Monday reported its first influenza death in a child this season. Already the Illinois Department of Public Health and numerous health departments across Chicago-area counties have issued warnings as hospital admissions and positive tests for influenza soar in the state. “More fever with the flu this year than people are accustomed to. And the fever can last up to seven days, so five to seven days. And that’s worrisome,” Dr. Mark Loafman, the chair of Family and Community Medicine at Cook County Health, told NBC Chicago. As cases reach “very high” levels in Illinois, a mutated and highly contagious variant known as “subclade K” has brought a change in telltale signs of the virus, experts have said.
What is Subclade K? What to know about ‘super flu’ strain and its symptoms
“Again, we recommend wearing a mask around anybody who’s vulnerable or if you’re in a crowded place for that first seven days. And, you know, absolutely great hand washing hygiene so you’re not spreading the virus around. And if you can stay in, stay home.” “It’s about five to seven days from the symptom onset before you stop really shedding high levels of the virus. So 10 days is perfect, but it really doesn’t need to be that long,” Loafman said. Flu symptoms typically begin within one to four days of exposure, according to the Cleveland Clinic. In Chicago, residents can get a flu shot by visiting any one of the city’s immunization clinics. “I kept putting it off and I wish I hadn’t because both my parents who I live with right now had the flu shot and didn’t get sick, luckily,” she said.
The Centers for Disease Control and Prevention estimates that there have been at least 4.6 million illnesses, 49,000 hospitalizations and 1,900 deaths from flu so far this season. The CDC recommends everyone 6 months and older receive a flu vaccine. The new strain, called subclade K, has made its way to the U.S. after spreading quickly through countries such as the UK, Canada and Japan. That H3N2 strain is always harsh, especially for older adults.
New K Variant Flu Outbreak: Rapid Spread, Fever, and Rising Risk of Lung Damage Explained
The effectiveness of the vaccine varies depending on how closely the virus strains in the vaccine match those currently circulating. A new strain of the flu is causing concerns for the rest of the winter season. According to the CDC, there have been at least 7.5 million illnesses in the US, 81,000 hospitalisations, and 3,100 deaths from flu so far this season.
What are the symptoms of super flu?
Influenza, also known as the flu, is a contagious respiratory illness caused by influenza viruses, according to the Centers for Disease Control and Prevention. Since the flu season began in October, at least 7.5 million people have contracted the illness, USA TODAY reports. The mutated strain, known as subclade K, originates from the most common flu-causing virus, influenza A, and one of its most common variations, H3N2. According to an update Monday, flu activity in the state has climbed to “very high” levels in recent days, the most severe of five categories of respiratory illness activity used by the CDC.
The most effective way to prevent serious illness from flu is vaccination, according to the World Health Organization, CDC and other leading medical institutions. Mask-wearing while sick or out and about during illness season can also help to prevent the spread. The last available tracing data from the CDC found that 91% of the 600 U.S. flu cases that were tested between Dec. 22 and 28 were caused by H3N2.
Japan also witnessed an early start, as the levels of H3N2 flu are now plateauing and may soon start to drop. Doctors say it causes extremely high fever, along with signs of a cold and flu. But they are different enough to evade some of the protection from this year’s vaccine. Subclade K’s mutations are not enough of a change to be considered an entirely new kind of flu. That includes at least eight child deaths and is based on data vegas casino download as of Dec. 20, before major holiday gatherings.
“Illinois is facing a significant winter surge in seasonal respiratory illnesses with flu activity at very high levels,” Dr. Sameer Vohra, IDPH director, said in a statement. “These are contagious viruses and people are indoors and we’ve had a lot of holiday travel and people together. So we would expect this spike would continue over the next few weeks,” he said. Everyone 6 months and older is eligible for the flu vaccine unless they have a specified medical condition, such as an allergy to its ingredients or a previous severe reaction to the shot. Though flu season ends May 17, 2025 (week 20), surveillance continues year-round,” the Florida Department of Health’s website says. Dubbed the “super flu,” it is a variant of influenza A H3N2 in subclade K, which was responsible for outbreaks in the United Kingdom and Japan. According to Today.com, scientists caught the H3N2 subclade K too late to update the vaccine for this season.
- It is possible for an infected person to spread the flu before their symptoms begin, and those without symptoms to spread the flu, too.
- The CDC reports that people with the flu are most contagious during the first three days of their illness.
- The effectiveness of the vaccine varies depending on how closely the virus strains in the vaccine match those currently circulating.
- Loafman said even those who have already had the flu should consider getting the vaccine if they haven’t already as the risk for reinfection also exists.
There are no rules about when you can or can’t get a vaccine, but professionals typically recommend getting your shot in September or October. “The flu reporting year uses standard reporting weeks outlined by the Centers for Disease Control and Prevention (CDC), where every year has 52 or 53 reporting weeks. It can last from a few days to two weeks, according to the Cleveland Clinic. According to the CDC’s FluView Interactive Map, which monitors visits for respiratory illness with fever plus a cough or sore throat, Florida is seeing low activity. H3N2 symptoms include fever, chills, body aches, headache, extreme fatigue, congestion or runny nose, and coughing.
