27. What are the types of
antigenic agents that may
constitute vaccines?

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Vaccines can be constituted dead
agentsof disease, of agents
of disease, of toxins or of
fragments the infectious agent.
Examples some vaccines and their
of antigenic agents are: ,
inactivated tuberculosis bacilli;
antitetanic , inactivated toxin;
antidiphtheric, inactivated ;
antipolio Salk, dead polio ; antipolio
Sabin, attenuated (inactivated)
virus.