H1N1 is the scariest flu in the environment. It is also called as Swine Flu, Pig influenza, pig flu. It is called swine flu because it was seen in people who were in direct contact with pigs but later a new virus emerged which was spread among people who hadn’t been close to pigs. Swine flu is one of the virus that is included in the vaccine chart. Swine flu is very contagious and is spread through saliva and mucus particles. It spreads in the same way as seasonal flu. When people who have it cough or sneeze, they spray tiny drops of the virus into the air. If you come in contact with these drops or touch a surface (such as a doorknob or sink) that an infected person has recently touched, you can catch H1N1 swine flu.