H1N1 Influenza Specialist Doctor IN MUMBAI H1N1 influenza, commonly known as swine flu, is a contagious respiratory illness caused by the H1N1 virus. It gained global attention during the 2009 pandemic. The virus spreads through droplets released when an infected person coughs or sneezes. Symptoms are similar to those of regular flu, including fever, cough, sore throat, body aches, and fatigue. While many recover without complications, severe cases can lead to hospitalization, particularly among young children, the elderly, and those with preexisting health conditions. Preventive measures include vaccination, frequent handwashing, and avoiding close contact with sick individuals. Early antiviral treatment can help reduce the severity of the illness.