The primary immune response is of low intensity upon first pathogen exposure, whereas the secondary immune response is high-intensity upon subsequent exposures.
A primary immune response is a low-intensity reaction during the first encounter with a pathogen, while a secondary response is a high-intensity reaction during subsequent encounters.
| Front | primary and secondary immune response |
|---|---|
| Back | primary: low-intensity response produced by the body when it encounters the pathogen for the first time secondary: high-intensity response produced by the body during subsequent encounters with the pathogen |
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