H3N2 Virus in India: The cases of sub-variant H3N2 of seasonal influenza are increasing in India but there is no need to panic. Experts have said that there is a need to increase vigilance and take precautionary measures to prevent this virus. According to the US Centers for Disease Control and Prevention (CDC), H3N2 is an influenza virus that usually spreads from pigs to humans. Its symptoms are similar to those of the seasonal flu virus. In this, symptoms of respiratory problems including fever and cough and sputum are seen. Apart from this, some patients also have other problems including body pain, nausea, vomiting or diarrhea.