WHY THIS FLU CRISIS IS HAPPENING Flu Shot Info...How the vaccine works: Influenza vaccine is produced by growing the virus in eggs. The virus is killed and processed to create the vaccine, which is given by injection under the skin. The body then produces antibodies to the virus over the next two to four weeks. If the immunized person then comes into contact with the influenza virus, the antibodies attack and kill the virus before it has a chance to cause infection. The vaccine contains the 3 most likely strains to be active during the flu season. Why the shortage?:...