Immunity (Leaving Cert Biology): Flashcards

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Immunity
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Induced immunity

Ability to produce antibodies against specific antigens

Active immunity

Body produces its own antibodies

Why active immunity is long-term

Memory cells survive in the body

Natural active immunity

Pathogen enters body naturally

Example of natural active immunity

Chicken pox

Artificial active immunity process

Injecting/ingesting small doses of non-reproductive antigens

Other names for artificial active immunity

Vaccination or immunisation

Vaccine definition

Non-disease causing dose of pathogen that stimulates antibody production

Passive induced immunity

Antibodies pass from one organism to another

Duration of passive immunity

About 6 months (short-term)

Why passive immunity is short-term

No memory cells produced, antibodies last only 6 months

Natural passive immunity

Antibodies pass from mother to child

How natural passive immunity occurs

Via placenta in womb or during breastfeeding

Duration babies protected by maternal antibodies

First 6 months of life

Artificial passive immunity

Injecting antibodies to counteract specific disease

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