Few types of vaccines are live virus vaccines, inactivated vaccines, toxoid vaccines and biosynthetic vaccines. Live virus vaccines use the weakened form of the virus. Examples are the MMR vaccine and the chickenpox vaccine. Inactivated vaccines are made up of a protein or other small bits taken from a virus or bacteria, the flu vaccine is an example of this. Toxoid vaccines contain a toxin or chemical produced by the bacteria or virus. They make you immune to the harmful effects of the infection, rather than the infection itself. Examples are vaccines against diphtheria and tetanus. Biosynthetic vaccines contain artificial substances that are very similar to pieces of the virus or