Short description
A vaccine contains an antigen that is given to individuals in order to establish protective immunity against a particular infection.
Synonyms
Inoculant
Serum

Detailed description

The antigen contained in the vaccine can consist of inactivated or attenuated pathogens or purified components of the microorganism. Usually, the vaccine also contains and adjuvans, which unspecifically increases the immune reaction to the antigen.