an cell. After binding, the flu
             virus penetrates the host cell; there, viral RNA strands move into the
             cell's nucleus. The viral RNA strands encode messenger RNA and
             ultimately produce new virus particles. The task of NA is simple but
             important: It enables the newly created virus to separate from the
             host cell and travel freely from one cell to another through the
             respiratory tract." (Walker and Webster 2003)
             The article goes on to state that flu epidemic occur when the two NA
             and HA proteins mutate. (Walker and Webster 2003) The flu virus can be
             unpredictable because it has the ability that is has to alter the NA and HA
             surface proteins and by doing so it can prevent being detected by the
             immune system of the host. (Walker and Webster 2003) The article explains
             that an individual with the illness their immune system creates antibodies
             and cell mediated reactions against the virus's antigens. (Walker and
             Webster 2003) When the individual's
             ...