A vaccine is a harmless variant or derivative of a pathogen that prompts the host's immune system to develop defenses against the actual pathogen.
A vaccine is a weakened or modified version of a pathogen that stimulates an immune response to protect against future infections.
| Front | vaccine |
|---|---|
| Back | A harmless variant or derivative of a pathogen that stimulates a host’s immune system to mount defenses against the pathogen. |
Tags: ch.19
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