Delhi is seeing renewed concern over H1N1, commonly called swine flu, as flu-like illnesses rise amid humid and changing weather. But there is an important detail that often gets missed: H1N1 has not disappeared. It has become part of the seasonal influenza viruses that circulate every year.The concern now is not simply the name “H1N1”, but how quickly influenza can move through homes, schools, offices and crowded indoor spaces. Doctors say people should stay alert without turning every fever or cough into a reason for panic.image.png