Influenza is a contagious respiratory illness that the influenza virus causes leading to the infection of nose, throat, and sometimes the lungs. It can result into mild to severe illness and sometimes can lead to death. Three types of influenza virus affect people that includes: type A, type B, and type C. Influenza is spread via infectious respiratory secretions that is caused by the formation of aerosol due to direct contact with an infected person. The influenza can cause seasonal epidemics along with high levels of mortality and morbidity.