The current spate of high fever and cough being seen in the country is being caused by Influenza A subtype H3N2, a subtype of viruses that cause influenza (flu), the Indian Council of Medical Research (ICMR) has confirmed. H3N2 causes more hospitalisations than other influenza subtypes, according to the apex health research agency. The current spate of high fever and cough being seen in the country is being caused by Influenza A subtype H3N2, a subtype of viruses that cause influenza (flu), the Indian Council of Medical Research (ICMR) has confirmed. H3N2 causes more hospitalisations than other influenza subtypes, according to the apex health research agency.