H3N2 Flu Delhi Cases | Symptoms, Risks & Preventive Measures

Delhi is currently dealing with a concerning increase in cases of H3N2 flu, alarming doctors, hospitals, and public health professionals. H3N2 flu is a subtype of the A flu virus, and is structurally and epidemiologically distinct from the common cold, which has significant implications for transmissibility and the potential for complications. The flu season is underway in Delhi, and the health department is urging vigilance and awareness of this rise among residents.

What is H3N2 Influenza?

H3N2 is one of the strains of the influenza virus that appears during seasonal outbreaks, and it has shown the capacity for rapid mutation and evolution, making control of the virus challenging. This strain spreads easily through respiratory secretions, with coughing and sneezing producing a high viral load, though it can also be spread through more simple conversation. H3N2 can also spread via direct contact with a porous and contaminated surface (fomites), followed by contact with the nose, mouth, or eyes.

Symptoms of H3N2 Flu

H3N2 flu symptoms are often more severe and last longer than a cold. Typical symptoms include:

Sudden fever
A cough that can last for up to two weeks
Runny nose and sore throat
Head and body aches
Nausea, stomach pain, and sometimes diarrhea
Ear pain or discomfort

Some patients, particularly children and the elderly, may be symptomatic for longer with these same symptoms, and still feel weak after they have recovered.

Who is at Risk?

Certain populations are at greater risk for severe illness from the H3N2 influenza virus. Health professionals have identified the following high-risk populations related to H3N2:

Pregnant women
Children younger than five years of age
Older adults over 60 years of age
Patients who suffer from chronic disease such as asthma, diabetes, or heart disease
Patients who are immune compromised from treatment of chemotherapy, steroids, or from HIV/AIDS
Healthcare workers and other first responders who are in constant contact with these patients

Preventive Actions Against H3N2

As cases increase, it is critical to follow preventative measures. Here are listed ways to avoid transmission and keep you and your family safe:

Get the flu shot – because seasonal flu vaccinations usually offer medically-accepted protection to the H3N2 strain of flu. Annually getting the flu vaccination decreases your risk of contracting the flu virus. If you become ill, your risk of developing complications is decreased.
Good hand hygiene – frequently wash your hands with soap and water or use hand sanitizer in order to prevent acquiring the illness via droplets from contaminated surfaces.
If crowded places are unavoidable, wear a mask – it is known that H3N2 is transferred via droplets therefore wearing a mask can help avoid additional exposure to infectious droplets in areas such as markets, health care facilities, and public transit.
Practice respiratory hygiene – it is essential to cover your mouth and nose when sneezing or coughing with either your elbow or a tissue (and disposing of used tissues after using them).
Build immunity – a balanced diet of nutritious foods, adequate food, and regular physical activity are beneficial in supporting your body’s own ability to fight off infections.

The current H3N2 influenza activity in Delhi brings forward a need for awareness and preventive care. Severe illness can occur with H3N2, although most cases can be treated with appropriate care and treatment if we act in timely fashion. Ultimately, the principle of protecting the most vulnerable will reign by maintaining good hygiene practice and informing yourself with the latest advisories on H3N2 in Delhi by public health professionals. Doing this now will help defend against the impact we are experiencing now in 2025 and help us to protect our communities.