H3N2 Virus Symptoms to Watch: Delhi NCR Reports Sharp Surge in Cases

Recent reports highlight a sharp increase in H3N2 virus cases across Delhi NCR, worrying families and healthcare experts alike. Part of the Influenza A family, H3N2 is currently spreading rapidly due to seasonal changes and fluctuating temperatures.

"H3N2 is surely rising now as more are having fever and symptoms such as sore throat and runny nose," said Dr Manjusha Agarwal, Senior Consultant, Internal Medicine, Gleneagles Hospital, Mumbai.

The surge is not confined to Delhi NCR; other states are also witnessing a rise in flu-like illnesses.

H3N2 Survey Findings in Delhi NCR

A recent LocalCircles survey revealed that 69% of households in Delhi NCR currently have members suffering from Covid/flu/viral fever-like symptoms.

Over 11,000 responses were collected across Delhi, Gurugram, Noida, Faridabad, and Ghaziabad.

Respondents comprised 63% males and 37% females.

The survey compared data from March 2025 and September 2025, highlighting a clear seasonal surge in influenza cases.

What is H3N2 Influenza?

H3N2 is a seasonal flu strain that tends to spread during weather changes. According to Dr Agarwal, the symptoms begin like a common cold but can worsen if left untreated.

Dr. Mayanka Lodha Seth, chief pathologist, Redcliffe Labs told Indian Express,"Unlike the regular flu or cold, H3N2 infection is more severe and often lasts longer."

H3N2 Symptoms to Watch Out For

Common symptoms of H3N2 include:

• Sudden high fever with chills
• Sore throat and runny nose
• Persistent cough
• Headache and body aches
• Fatigue and weakness
• In some cases, muscle pain

Warning signs: If symptoms like difficulty breathing, chest pain, or persistent fever despite medication appear, medical attention should be sought immediately.

Risks and Complications

Doctors warn that H3N2 can worsen existing health conditions.

May lead to pneumonia in severe cases

Can aggravate heart and lung diseases

Higher risk among children, elderly, pregnant women, and chronic patients (asthma, diabetes, etc.)

Diagnosis and Treatment of H3N2

Most cases are diagnosed clinically by doctors. In some instances, throat swabs or lab tests may be recommended.

No specific cure exists for H3N2.

Treatment includes rest, hydration, and fever management medicines.

Antiviral drugs may be prescribed for high-risk or severe cases.

Preventive Measures Against H3N2

Doctors strongly recommend preventive steps to reduce H3N2 transmission:

Wash hands frequently with soap and water

Wear masks in crowded areas

Avoid close contact with sick individuals

Get vaccinated against seasonal flu

Maintain good immunity with a balanced diet and adequate sleep