Delhi Sees Surge IH3N2 Flu Cases; Doctors Urge Vigilance

Delhi hospitals have reported a sharp rise in patients experiencing flu-like symptoms, including high-grade fever, sore throat, persistent body aches, headaches, and general weakness.

Unlike the common flu, these symptoms often do not respond effectively to over-the-counter medications such as paracetamol.

Medical experts have identified the H3N2 influenza A virus as the dominant strain behind this outbreak.

Recovery from H3N2 infections can take a week or longer, and some patients require hospitalisation due to complications.

Experts Explain the Role of Monsoon in Viral Spread

Dr Vikas Maurya, Senior Director and HOD of Respiratory Medicine & Respiratory Critical Care at Fortis Hospital, Shalimar Bagh, Delhi, said prolonged monsoon seasons increase the ease of viral transmission.

“Seasonal flu is a broad term for multiple respiratory viruses, whereas H3N2 is a specific subtype of influenza A currently predominant in Delhi,” he explained.

Dr Vikas Mittal, Pulmonologist and Director of Wellness Home Clinic and Sleep Centre, Pashim Vihar, noted that many patients have reported cold and cough symptoms lasting longer than usual.

“H3N2 tends to cause persistent cough, fatigue, and low-grade fever compared to common cold viruses,” he said.

Weather changes, pollution, and weakened immunity due to poor sleep or nutrition are contributing factors.

“While common colds usually resolve in 5–7 days, H3N2 infections can last up to two weeks in some cases,” added Dr Mittal.

Children are experiencing symptoms such as cough, fever, nasal congestion, and wheezing.

“Children are more vulnerable because their immunity is still developing, and they are in close contact with peers at schools and daycare centres,” Dr Mittal said.

When to Seek Medical Care in IH3N2?

Health professionals advise visiting a doctor if the fever persists beyond three days, the cough worsens, or if patients experience chest pain or difficulty breathing.

Both common cold and H3N2 infections present with similar symptoms, but H3N2 often causes prolonged fever, persistent cough, and sometimes lung complications like pneumonia.

Dr Prashant Sinha, Head of Emergency at PSRI Hospital, warned against self-medication and delaying rest.

“Adequate hydration, rest, and timely medical supervision are crucial,” he said.

In children, complications can include ear infections or bronchitis, particularly in those with asthma or other underlying conditions.

Doctors stress that more than half of OPD patients are presenting with high-grade fever and chest congestion, highlighting the need for early medical attention, rest, and hydration.

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