The common flu vaccine provides protection against the influenza virus. however, this particular vaccine must be given on a seasonal basis in order to provide proper protection. what aspect of the influenza virus makes lifelong immunization impossible?

Viruses determines the border line between the living and non living organisms. Viruses always requires a host to show the characteristics of the living organism.

Virus may also acts as pathogen for the human being. The virus has the ability to change evolve their genetic material rapidly. In case of the immunization of the influenza virus, virus might evolves quickly for the particular one vaccine and helps in providing long term protection.