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DEFENCE AGAINST DISEASE

IMMUNITY

Active Immunity

Passive Immunity

Natural immunity  is active or passive immunity acquired from natural sources.

Artificial immunity  is active or passive immunity acquired by medical intervention.

SUMMARY

 

Active immunity

Passive immunity

Natural immunity Real infection followed by establishment of memory cells

Maternal antibodies pass to foetus across placenta or to infant via colostrum of milk.
No memory cells.

Artificial immunity Immunisation by vaccine followed by establishment of memory cells

Antibiotics produced in another animal and purified from their blood serum.
No memory cells

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© Paul Billiet 2009