What is the New Flu Virus Variant?

Posted on January 23, 2026 by Patrick Hercules

There is a new variant of the flu virus called H3N2 subclade K that is affecting the U.S. this flu season, after circulating in other countries last summer.

This variant is a mutated strain of H3N2, which is a subtype of influenza A. According to the Centers for Disease Control and Prevention (CDC), H3N2 is the main type of flu spreading in the U.S. as of mid-November.

Additionally, scientists from around the world have reported that H3N2 subclade K, a mutation of H3N2, has undergone several mutations, which haven’t been seen before in flu viruses. These mutations may make this new strain more severe than usual, with some experts believing that these changes could reduce how well the current flu vaccine prevents infection.

However, it is important to note that it is still recommended to receive the flu vaccine, as the CDC notes that the H3N2 subclade K strain can cause severe symptoms in older adults over the age of 65 and children under the age of five. Other people who are vulnerable to severe symptoms of the subclade K strain include:

Anyone who is immunocompromised

Pregnant people

People with underlying chronic conditions such as diabetes, heart disease, or lung disease

Doctors warn that flu infections, if left untreated or not treated early enough, can increase the risk of complications such as ear infections and sinus infections, as well as more severe complications, including pneumonia, hospitalization, and even death.

In 2024, data from the CDC showed that the U.S. had the most total flu-related hospitalizations in about 15 years, and close to 280 pediatric deaths from the flu.

During this current flu season, the CDC has reported an estimate of 18 million cases, 230,000 hospitalizations, and 9,300 deaths nationwide, with 32 of those deaths being pediatric. What’s more, the CDC says that among the children eligible for the flu vaccine and with known vaccination status, 90% of pediatric deaths this season were among children not fully vaccinated against influenza.

People who are infected with the flu typically develop symptoms within one to four days after exposure. Flu symptoms include:

Fever and chills

Muscle and body aches

Headaches

Sore throat

Cough

Deep fatigue or tiredness

Runny nose or stuffy nose

Vomiting and diarrhea (in some cases, especially in children)

For most healthy people, the flu resolves within a week or two with rest and fluids. However, certain symptoms are red flags that indicate you need to seek immediate medical attention.

Difficulty breathing or shortness of breath

Persistent pain or pressure in the chest or abdomen

Persistent dizziness, confusion, or inability to wake up

Seizures

Not urinating, which is a sign of severe dehydration

Severe muscle pain

A high fever that does not respond to fever-reducing medication

Symptoms that improve but then return with a fever and worse cough

It is important to remember that getting vaccinated is the best way to prevent serious symptoms of the flu virus. There are also several steps you can take to reduce your risk of getting and spreading the flu. They include:

Washing your hands frequently with soap and water.

Avoiding touching your eyes, nose, and mouth.

Staying home when you are sick to prevent the spread of the virus to others.

Covering your cough and sneeze with a tissue or your elbow.

Considering wearing a mask in crowded indoor spaces, especially if you are around high-risk individuals.

If you or a loved one is experiencing any flu symptoms, you can receive treatment from a neurologist at Flushing Hospital Medical Center’s Ambulatory Care Center. To schedule an appointment, please call (718) 670-5486.

All content of this newsletter is intended for general information purposes only and is not intended or implied to be a substitute for professional medical advice, diagnosis or treatment. Please consult a medical professional before adopting any of the suggestions on this page. You must never disregard professional medical advice or delay seeking medical treatment based upon any content of this newsletter. PROMPTLY CONSULT YOUR PHYSICIAN OR CALL 911 IF YOU BELIEVE YOU HAVE A MEDICAL EMERGENCY.

The Importance of Getting Vaccinated During Cold and Flu Season

Posted on December 10, 2025 by Patrick Hercules

Flu season can be unpredictable, as it can begin as early as fall and can last until spring. Flu activity is usually at its peak during winter, and public healthcare professionals, advocates, and communities come together to promote flu vaccination as the flu can cause serious health complications, such as bacterial infections or pneumonia. If it isn’t treated in time, the flu can even lead to death.

Vaccination is particularly important for people who are at higher risk of developing serious flu complications, including pregnant women and young children. Millions of children get sick with the flu every year, and thousands will be hospitalized as a result. Women are also at higher risk of developing serious flu complications during pregnancy.

Since flu viruses are constantly changing and protection from vaccination decreases over time, getting a flu vaccine every year is the best way to reduce your risk of the flu. A flu vaccine is the only vaccine that protects against the flu and has been shown to reduce the risk of illness from the flu, hospitalization, and death.

During flu season, we encourage everyone six months and older to get their annual flu vaccine, especially pregnant women, young children, and other people who are at a higher risk of developing serious flu complications. The more people who get vaccinated against the flu, the more people who will be protected from it.

If you or a loved one would like to get the flu vaccine, you can visit Flushing Hospital Medical Center’s Ambulatory Care Center. To schedule an appointment, please call (718) 670-5486.

When Is The Best Time To Get The Flu Vaccine ?

Posted on October 18, 2018 by Andrew Rubin

Flu season can start in September and run until May. Even before the summer is over, pharmacies start advertising that the flu vaccine is available. While many people believe that the best time to get a flu vaccine is as soon as possible, getting it in October probably is the best option. Some research has shown that the effects of the vaccine start to wear off after six months so we want to make sure we are well protected when the height of the flu season is upon us.

Every year the flu vaccine is different, manufactured with the hope that it will be effective against the prevalent strain expected for that year. It is estimated that it takes approximately two weeks for the vaccine to become fully effective, so being covered early is important. Everyone who is going to be vaccinated wants to be prepared before the peak of the flu season which runs from December to late March. If you would to schedule an appointment for a flu vaccine in the Flushing Hospital Medical Center’s Ambulatory Care Center please call 718-670-5486.