What is the New Flu Virus Variant?

Posted on December 4, 2025 by Patrick Hercules

A new variant of the flu virus, known as H3N2 subclade K, is affecting the U.S. this season, having circulated in other countries since the 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 suggesting that these changes could reduce the effectiveness of the current flu vaccine in preventing 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 serious complications such as pneumonia, hospitalization, and even death.

Last year, 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.

People who are infected with the flu usually develop symptoms about one to four days after being exposed. 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 are experiencing any flu symptoms, you can schedule an appointment with a doctor at Jamaica Hospital Medical Center’s Ambulatory Care Center. Please call (718) 206-7001.

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.

How Does Sleep Affect Your Immune System?

Posted on November 17, 2016 by Zakiya Hazel-Jemmott

Lack of sleep can affect your immune system, but how? Studies show that people that don’t get quality sleep or enough hours of sleep are more likely to get sick after being exposed to a virus like the flu. The recovery time from a cold is also prolonged as a result of not getting enough sleep.

Sleep deprivation may decrease production of the amount of infection-fighting antibodies and cells that strengthen the immune system. Essentially our bodies need sleep to fight infectious diseases and recover faster from common cold viruses.

How much sleep do you need to bolster your immune system? The optimal amount of sleep for most adults is seven to eight hours of good sleep each night. Teenagers need nine to 10 hours of sleep. School-aged children may need 10 or more hours of sleep.

It’s very common to be told to get some rest when fighting off a cold or infection. Now we know why. As we move through cold and flu season, the key to staying healthy might just be getting a good night’s sleep.

However sleep does not always come easy to everyone. If you or someone you know is experiencing trouble with their sleep patterns, Jamaica Hospital Medical Center’s Sleep Center is available to treat you. This state-of-the-art Sleep Center is a 4-bed unit that features comfortable, homelike rooms with sound proof walls for total privacy. For more information please call, 718-206-5916.

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Asthma and Flu Season

Posted on November 11, 2016 by Zakiya Hazel-Jemmott

Asthma is a lung disease that is caused by chronic inflammation of the airways, which can result in an asthma attack. During an attack, people experience symptoms such as wheezing, breathlessness, chest tightness, and nighttime or early morning coughing. Many things can trigger an asthma attack and one of the most common is the flu.

With flu season upon us, what impact can the flu have on those with asthma? According to the CDC, though people with asthma are not more likely to get the flu, an infection can be more serious for people with asthma, even if their asthma is mild or their symptoms are well-controlled by medication. An influenza infection can trigger asthma attacks and a worsening of asthma symptoms. It also can lead to pneumonia and other acute respiratory diseases. In fact, adults and children with asthma are more likely to develop pneumonia after getting sick with the flu than people who do not have asthma. Asthma is the most common medical condition among children hospitalized with the flu and one of the more common medical conditions among hospitalized adults.

If you have asthma, it is recommended that you get an annual influenza vaccine. Flu shots are generally recommended for people six months and older regardless of whether or not they have asthma. The flu shot has a long established safety record in people with asthma. In addition to getting the flu vaccine, proper hand-hygiene is strongly advised in order to prevent the spread of the flu.

If you do get sick with flu symptoms, speak with your doctor immediately to see if antiviral medications are an option for you. If prescribed, anti-viral drugs should be administered with 48 hours after the on-set of symptoms and can help minimize the effects of the flu. For people with asthma, this can help by reducing the risk of influenza from progressing into pneumonia or other respiratory diseases.

If you have asthma, and would like to receive a flu shot, please call Jamaica Hospital’s Ambulatory Care Center at 718-206-7001 to schedule an appointment or visit our website at to find our closest MediSys Family Care Center to your home.