<div class="" data-article-body="true"><p class="mb-4 text-lg md:leading-8 break-words">A new influenza strain this <a href="https://www.goodmorningamerica.com/topics/FluSeason" rel="nofollow noopener" target="_blank" data-ylk="slk:flu season;elm:context_link;itc:0;sec:content-canvas" class="link "><u>flu season</u></a> is raising concerns as Americans <a href="https://www.goodmorningamerica.com/video/127816839" rel="nofollow noopener" target="_blank" data-ylk="slk:hit the roads and take to the skies;elm:context_link;itc:0;sec:content-canvas" class="link "><u>hit the roads and take to the skies</u></a> ahead of the Thanksgiving holiday, with fewer people choosing to get vaccinated.</p><h2 class="mb-4 text-xl font-bold md:text-2xl">What is the new flu strain subclade K?</h2><p class="mb-4 text-lg md:leading-8 break-words">The new flu strain, called <a href="https://abcnews.go.com/Health/video/health-experts-warn-subclade-flu-strain-127808596" rel="nofollow noopener" target="_blank" data-ylk="slk:subclade K;elm:context_link;itc:0;sec:content-canvas" class="link "><u>subclade K</u></a>, is a variant of the H3N2 virus that has been circulating since the summer in other countries.</p><p class="mb-4 text-lg md:leading-8 break-words">Experts point to the new variant as a main driver of a spike in flu cases in Canada, Japan, and the U.K. Of nearly 150 test samples that were registered as the H3 lineage, over 50% were subclade K, according to the <a href="https://www.cdc.gov/fluview/surveillance/2025-week-46.html" rel="nofollow noopener" target="_blank" data-ylk="slk:Centers for Disease Control and Prevention;elm:context_link;itc:0;sec:content-canvas" class="link "><u>Centers for Disease Control and Prevention</u></a>.</p><figure class="relative mb-4"><div class="relative"><img alt="Adobe Stock - PHOTO: Stock photo of a child with flu symptoms." loading="lazy" width="960" height="640" decoding="async" data-nimg="1" class="rounded-lg" style="color:transparent" src="https://s.yimg.com/ny/api/res/1.2/X_2vMLWjRxR48hDS48XgMQ--/YXBwaWQ9aGlnaGxhbmRlcjt3PTk2MDtoPTY0MDtjZj13ZWJw/https://media.zenfs.com/en/us.abcnews.gma.com/2a3ac4782c3612e538ded089c353ca9d"><button aria-label="View larger image" class="group absolute bottom-3 right-3 size-10 md:size-[50px] lg:inset-0 lg:size-full lg:bg-transparent" data-ylk="elm:expand;itc:1;sec:image-lightbox;slk:lightbox-open;"><span class="absolute bottom-0 right-0 rounded-full bg-white p-3 opacity-100 shadow-elevation-3 transition-opacity duration-300 group-hover:block group-hover:opacity-100 md:p-[17px] lg:bottom-6 lg:right-6 lg:bg-white/90 lg:p-5 lg:opacity-0 lg:shadow-none"><svg viewbox="0 0 22 22" aria-hidden="true" class="size-4 lg:size-6" width="22" height="22"><path d="M12.372.92c0-.506.41-.916.915-.916L21 0l-.004 7.712a.917.917 0 0 1-1.832 0V3.183l-6.827 6.828-1.349-1.348 6.828-6.828h-4.529a.915.915 0 0 1-.915-.915M1.835 17.816l6.828-6.828 1.349 1.349-6.829 6.827h4.529a.915.915 0 0 1 0 1.831L0 21l.004-7.713a.916.916 0 0 1 1.831 0z"></path></svg></span></button><dialog aria-label="Modal Dialog" aria-modal="true" class="fixed inset-0 z-4 size-full max-h-none max-w-none bg-white hidden"></dialog></div><figcaption class="relative text-sm mt-1 pr-2.5"><div style="max-height:none;overflow:visible">Adobe Stock - PHOTO: Stock photo of a child with flu symptoms.</div></figcaption></figure><h2 class="mb-4 text-xl font-bold md:text-2xl">Does the flu vaccine protect against subclade K?</h2><p class="mb-4 text-lg md:leading-8 break-words">Although the current flu vaccine may not be a perfect match for the new subclade K strain, <a href="https://www.cdc.gov/flu/prevention/index.html" rel="nofollow noopener" target="_blank" data-ylk="slk:the CDC;elm:context_link;itc:0;sec:content-canvas" class="link "><u>the CDC</u></a> and doctors say the best way to protect you and your family is to still get vaccinated.</p><p class="mb-4 text-lg md:leading-8 break-words">"Vaccination [is] key," ABC News chief medical correspondent Dr. Tara Narula said on <a href="https://www.goodmorningamerica.com/video/127818607" rel="nofollow noopener" target="_blank" data-ylk='slk:"Good Morning America";elm:context_link;itc:0;sec:content-canvas' class="link "><u>"Good Morning America"</u></a> Monday. "It's not too late now. It takes about two weeks to develop antibodies that will decrease the rate of serious hospitalizations and illnesses and even death, even though it may not be a perfect match for [the current flu strain]."</p><p class="mb-4 text-lg md:leading-8 break-words"><a href="https://www.goodmorningamerica.com/wellness/story/covid-flu-rsv-vaccines-amid-respiratory-virus-season-126597051" rel="nofollow noopener" target="_blank" data-ylk="slk:What to know about COVID, flu, RSV vaccines amid respiratory virus season;elm:context_link;itc:0;sec:content-canvas" class="link ">What to know about COVID, flu, RSV vaccines amid respiratory virus season</a></p><p class="mb-4 text-lg md:leading-8 break-words">International reports show that subclade K may have more severe symptoms in older adults and children, and <a href="https://www.cdc.gov/flu/highrisk/index.htm" rel="nofollow noopener" target="_blank" data-ylk="slk:the CDC;elm:context_link;itc:0;sec:content-canvas" class="link "><u>the CDC</u></a> notes that those who are most vulnerable to the flu overall include older adults over 65, children under the age of 5, anyone who is immunocompromised, pregnant people, and also people with underlying chronic conditions, such as diabetes, heart disease or lung disease.</p><figure class="relative mb-4"><div class="relative"><img alt="Anna Kraynova/Adobe Stock - PHOTO: Stock photo of a child with flu symptoms." loading="lazy" width="960" height="640" decoding="async" data-nimg="1" class="rounded-lg" style="color:transparent" src="https://s.yimg.com/ny/api/res/1.2/nYoGUqQyMqHsjvXOLG41yA--/YXBwaWQ9aGlnaGxhbmRlcjt3PTk2MDtoPTY0MDtjZj13ZWJw/https://media.zenfs.com/en/us.abcnews.gma.com/152ba51a43ac71ea1ca279a923fbfb44"><button aria-label="View larger image" class="group absolute bottom-3 right-3 size-10 md:size-[50px] lg:inset-0 lg:size-full lg:bg-transparent" data-ylk="elm:expand;itc:1;sec:image-lightbox;slk:lightbox-open;"><span class="absolute bottom-0 right-0 rounded-full bg-white p-3 opacity-100 shadow-elevation-3 transition-opacity duration-300 group-hover:block group-hover:opacity-100 md:p-[17px] lg:bottom-6 lg:right-6 lg:bg-white/90 lg:p-5 lg:opacity-0 lg:shadow-none"><svg viewbox="0 0 22 22" aria-hidden="true" class="size-4 lg:size-6" width="22" height="22"><path d="M12.372.92c0-.506.41-.916.915-.916L21 0l-.004 7.712a.917.917 0 0 1-1.832 0V3.183l-6.827 6.828-1.349-1.348 6.828-6.828h-4.529a.915.915 0 0 1-.915-.915M1.835 17.816l6.828-6.828 1.349 1.349-6.829 6.827h4.529a.915.915 0 0 1 0 1.831L0 21l.004-7.713a.916.916 0 0 1 1.831 0z"></path></svg></span></button><dialog aria-label="Modal Dialog" aria-modal="true" class="fixed inset-0 z-4 size-full max-h-none max-w-none bg-white hidden"></dialog></div><figcaption class="relative text-sm mt-1 pr-2.5"><div style="max-height:none;overflow:visible">Anna Kraynova/Adobe Stock - PHOTO: Stock photo of a child with flu symptoms.</div></figcaption></figure><h2 class="mb-4 text-xl font-bold md:text-2xl">How dangerous is the subclade K variant?</h2><p class="mb-4 text-lg md:leading-8 break-words">Doctors warn that flu infections aren't the same as the common cold and can increase the risk of complications such as ear infections and sinus infections, as well as more serious complications such as pneumonia, hospitalization, and even death, if left untreated or not treated early enough.</p><p class="mb-4 text-lg md:leading-8 break-words">Cases of H3N2 viruses tend to cause slightly more severe symptoms than other strains such as the H1N1 virus, according to <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC10489067/" rel="nofollow noopener" target="_blank" data-ylk="slk:one study;elm:context_link;itc:0;sec:content-canvas" class="link "><u>one study</u></a>.</p><p class="mb-4 text-lg md:leading-8 break-words"><a href="https://www.goodmorningamerica.com/video/119547119" rel="nofollow noopener" target="_blank" data-ylk="slk:Simple ways to help prevent cold and flu;elm:context_link;itc:0;sec:content-canvas" class="link ">Simple ways to help prevent cold and flu</a></p><h2 class="mb-4 text-xl font-bold md:text-2xl">Symptoms of the subclade K flu strain</h2><p class="mb-4 text-lg md:leading-8 break-words">"You'll usually develop [symptoms] about one to four days after being exposed, and it feels like being hit by a truck," said Narula. "It's different from a cold, so you're going to have fever, muscle aches, headaches, chills, sore throat, cough, runny nose, stuffy nose, maybe even vomiting and diarrhea."</p><p class="mb-4 text-lg md:leading-8 break-words">Last year, <a href="https://www.cdc.gov/mmwr/volumes/74/wr/mm7436a2.htm" rel="nofollow noopener" target="_blank" data-ylk="slk:CDC data;elm:context_link;itc:0;sec:content-canvas" class="link "><u>CDC data</u></a> showed the U.S. had the most total <a href="https://www.goodmorningamerica.com/video/125553905" rel="nofollow noopener" target="_blank" data-ylk="slk:flu-related hospitalizations;elm:context_link;itc:0;sec:content-canvas" class="link ">flu-related hospitalizations</a> in about 15 years and close to 280 pediatric deaths from the flu.</p><p class="mb-4 text-lg md:leading-8 break-words">To treat influenza infections, doctors recommend staying at home if you have any flu-like symptoms and to seek medical treatment sooner than later. Doctors may prescribe antiviral medications, according to <a href="https://www.cdc.gov/flu/treatment/index.html" rel="nofollow noopener" target="_blank" data-ylk="slk:the CDC;elm:context_link;itc:0;sec:content-canvas" class="link "><u>the CDC</u></a>, to decrease symptoms and also lessen the risk of developing serious complications.</p></div>

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