Q. What are the types of antigenic agents that may constitute vaccines?
Vaccines can be constituted of dead agents of disease, of inactivated toxins, of inactivated agents of disease or of fragments of the infectious agent.
Examples of some vaccines and their kind of antigenic agents are: bacilli; antitetanic vaccine, inactivated BCG, inactivated tuberculosis toxin; antidiphtheric, inactivated toxin; antipolio Salk, dead poliovirus; antipolio Sabin, attenuated (inactivated) poliovirus.