Types of ImmunityATI TEAS 7 cheat sheet

Active, passive, natural, artificial

10 key facts 3 practice questions Reviewed Oct 2026

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Active

Your own immune system makes the antibodies
Natural active — recovering from the infection
Artificial active — vaccination
Long-lasting, includes memory

Passive

Antibodies given from outside
Natural passive — placenta and breast milk
Artificial passive — immunoglobulin injection
Immediate but temporary

The Trade-Off

Active is slow to build but lasts; passive is instant but fades

Vaccines

Expose the body to a harmless form so memory cells form

Key takeaway

Active, passive, natural, artificial

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