This document summarizes information about the H1N1 swine flu virus, including that the World Health Organization has declared it the first flu pandemic of the 21st century. It has infected over 55,000 people in 108 countries, including 238 deaths. Delhi, India is considered at high risk due to its dense population and many international travelers. Swine flu is an airborne viral infection causing flu-like symptoms from mild to severe. It can spread through coughing, sneezing, or touching infected surfaces. Basic prevention methods include handwashing, covering coughs and sneezes, avoiding crowds when sick, and getting plenty of rest.