Over the past few weeks, Delhi-NCR has seen a sharp increase in viral illnesses. According to a LocalCircles survey of over 11,000 households, 69% reported at least one member displaying symptoms such as fever, cough, sore throat, and respiratory distress. Compared to earlier this year, the current outbreak represents a significant escalation. Doctors and virologists point to influenza A's H3N2 subtype as the leading driver of this surge. What's unusual this season is the high severity of cases, with fevers lasting longer and more hospitalisations than typical seasonal flu.