H3N2 is a subtype of the Influenza A virus, and one of the main viruses causing seasonal flu outbreaks in humans. While flu is a common viral illness, the H3N2 strain is known to be more aggressive, especially in the elderly, children, and people with respiratory illnesses. In the past year, India has seen a spike in H3N2 cases, leading to more hospitalizations compared to the typical flu season.