Reports have confirmed a sharp rise in H3N2 virus cases, a subtype of Influenza A, particularly among families in Delhi-NCR. “H3N2 is surely rising now as more are having fever and symptoms such as sore throat, runny nose,” said Dr. Smriti Jha, senior consultant, internal medicine.
The outbreak is not limited to Delhi-NCR. Increasing numbers of households across states are reporting flu-like illness. “Although not all cases are tested, the growing numbers make it clear that the virus is circulating extensively,” Dr. Jha told The Shining Media.
A LocalCircles survey highlighted the severity, showing that 69 per cent of households surveyed in Delhi NCR currently had one or more individuals suffering from Covid/flu/viral fever-like symptoms. This September 2025 survey, compared to data from March 2025, revealed the rising influenza impact in Delhi NCR. The survey included over 11,000 responses from residents of Delhi, Gurugram, Noida, Faridabad, and Ghaziabad, with 63 per cent male and 37 per cent female participants.
What is H3N2?
According to Dr. Jha, H3N2 influenza is a seasonal flu strain that spreads quickly, especially during weather changes. “The symptoms often start like a common cold but can worsen if not addressed early,” she cautioned.
Seasonal changes, fluctuating temperatures, and reduced community immunity are major contributors to the rapid spread. Unlike the common cold or regular flu, H3N2 is often more severe and tends to last longer. “If you have been suffering from a cough or cold for more than 48 hours, it’s time to consult your doctor without delay,” added Dr. Jha.
Symptoms of H3N2
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Sudden high fever with chills
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Sore throat, runny nose, cough
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Headache, body aches, and fatigue
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In some patients, muscle pain
Complicated cases may show difficulty breathing, chest pain, bluish lips/nails, confusion, dizziness, or dehydration. Prolonged fever unresponsive to medication is a major warning sign.
Dr. Jha emphasized that “in certain cases, H3N2 can lead to pneumonia, bronchitis, or worsening of existing heart and lung diseases. Persistent high fever, shortness of breath, or chest pain should prompt immediate medical intervention.”
High-Risk Groups
Children, elderly people, pregnant women, and individuals with chronic illnesses like asthma, diabetes, or heart disease are at elevated risk. Children, in particular, may also experience nausea, vomiting, or diarrhea in addition to respiratory distress.
Diagnosis and Treatment
Most H3N2 cases are diagnosed based on clinical symptoms. In some cases, diagnostic tests like throat swabs or rapid influenza tests may be ordered.
“There is no direct cure for H3N2,” said Dr. Jha. “Treatment focuses on rest, hydration, and medication for fever and discomfort. Antivirals may be prescribed in severe or high-risk cases.”
Prevention Measures
Good hygiene practices remain critical in curbing the spread:
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Frequent handwashing
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Mask usage in crowded spaces
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Avoiding close contact with infected individuals
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Maintaining strong immunity through balanced diet and adequate sleep
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Getting seasonal influenza vaccination
“Timely recognition of symptoms, along with preventive habits, can mean the difference between recovery at home and serious complications,” Dr. Jha stressed.
