People can become immune to infectious disease by vaccine or toxoid {vaccination}|. Vaccines can use dead virus or bacteria. People can react to antigen but not get sick.
Vaccines {attentuated} can use killed or harmless organisms.
Vaccines {subunit vaccine} can use only surface-protein antigen, not whole virus or bacteria.
People can become immune to infectious disease by being infected with antigen {toxoid}| retaining antigenic property but having no ability to reproduce.
People can become immune to infectious disease by being infected with low-toxicity antigen {vaccine}|.
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Date Modified: 2022.0225