A persistent cough, sometimes accompanied by fever, running through India for the past two-three months is due to Influenza A subtype H3N2, ICMR experts said.

The H3N2, which has been in wide circulation for the past two-three months, causes more hospitalisations than other subtypes, said Indian Council of Medical Research (ICMR) scientists who keep a close watch on ailments caused by respiratory viruses through the Virus Research and Diagnostic Laboratories network.