Influenza, also known as flu, is a contagious disease which spreads from person to person very rapidly. When an infected person sneezes or coughs the virus spreads to those close by, affecting immuno-compromised patients the most. The influenza virus is broadly classified as... influenza A, influenza B, and influenza C. The influenza vaccine come in both inactive and weakened viral forms. Request a sample of Global Influenza Vaccine Market @ http://www.orbisresearch.com/contacts/request-sample/Más